Hole doping in polythiophenes encapsulated in semiconducting and metallic single-walled carbon nanotubes: Impact of the electronic structure Reviewed

Hiroto Kageyama, Koji Asaka, Hideo Kishida, and Takeshi Koyama

Macromolecules   54   11147 - 11153   2021

Light emission and structural changes in a suspended multiwall carbon nanotube on application of electric current Reviewed

Koji Asaka, Koshi Nishikawa, and Yahachi Saito

Diamond and Related Materials   111   108175   2021

Raman spectroscopy and TEM of long linear carbon chain formed in CNT field emission cathode Reviewed

Koji Asaka, Satoshi Toma, and Yahachi Saito

e-Journal of Surface Science and Nanotechnology   18   159 - 163   2020

Excitation energy transfer by electron exchange via two-step electron transfer between single-walled carbon nanotube and encapsulated magnesium porphyrin Reviewed

Takeshi Koyama, Junpei Sugiura, Tomonari Koishi, Ryosuke Ohashi, Koji Asaka, Takeshi Saito, Yanlin Gao, Susumu Okada, and Hideo Kishida

The Journal of Physical Chemistry C   124   19406 - 19412   2020

Application of multiwall carbon nanotubes to conductive manipulation-probe tips for in-situ transmission electron microscopy of nanometer-sized material: Electrical measurement of a silicon nanoparticle Reviewed

Koji Asaka, Tomohiro Terada, and Yahachi Saito

Materials Research Express   6   015038-1-5   2019

Raman spectroscopy and transmission electron microscopy study on long linear atomic carbon chains generated by field electron emission accompanied with electrical discharge of carbon nanotube films Reviewed

Koji Asaka, Satoshi Toma, and Yahachi Saito

SN Applied Sciences   1   493   2019

Si/SiO2 core/shell luminescent silicon nanocrystals and porous silicon powders with high quantum yield, long lifetime and good stability Reviewed

Bernard Gelloz, Firman Bagja Juangs, Tomohiro Nozaki, Koji Asaka, Nobuyoshi Koshida, and Lianhua Jin

Frontiers in Physics   7   47-1-7   2019

Bulk synthesis of linear carbon-chains confined inside single-wall carbon nanotubes by vacuum discharge Reviewed

Satoshi Toma, Koji Asaka, Masaru Irita, and Yahachi Saito

Surface and Interface Analysis   51   131 - 135   2019

Different molecular arrangement of perylene in metallic and semiconducting carbon nanotubes: Impact of van der Waals interaction Reviewed

Takeshi Koyama, Kazuma Fujiki, Yuya Nagasawa, Susumu Okada, Koji Asaka, Yahachi Saito, and Hideo Kishida

The Journal of Physical Chemistry C   122   5805 - 5812   2018

High-temperature reaction of amorphous silicon with carbon on a multiwall carbon nanotube heater and temperature measurement by thermal radiation spectra Reviewed

Koji Asaka, Tomohiro Terada, and Yahachi Saito

Journal of Materials Science   52   7232 - 7238   2017

In-situ TEM study on structural change and light emission of a multiwall carbon nanotube during Joule heating Reviewed

Koshi Nishikawa, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

IOP Conference Series: Materials Science and Engineering   304   012011   2017

Facile synthetic route to atomically thin conductive wires from single-species molecules in one-dimensionally confined space: Doped conjugated polymers inside single-walled carbon nanotubes Reviewed

Makoto Sasaki, Takeshi Koyama, Hideo Kishida, Koji Asaka, Yahachi Saito, Yukihiro Yoshida, and Gunzi Saito

The Journal of Physical Chemistry Letters   8   1702 - 1706   2017

Ultrafast excitation energy transfer from encapsulated quaterrylene to single-walled carbon nanotube Reviewed

Takeshi Koyama, Takuya Tsunekawa, Takeshi Saito, Koji Asaka, Yahachi Saito, Hideo Kishida, and Arao Nakamura

Journal of Luminescence   169   645 - 648   2016

Field emission patterns showing symmetry of electronic states in graphene edges Reviewed

Noboru Yokoyama, Kazuya Nakakubo, Kohji Iwata, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Surface and Interface Analysis   48   1217 - 1220   2016

In situ TEM study on structural and electric conduction properties of a multiwall carbon nanotube connected to a Mo electrode Reviewed

Yuji Shinomiya, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Surface and Interface Analysis   48   1206 - 1209   2016

Structure of amorphous carbon films deposited on Ni nanoparticles under ultrahigh vacuum at room temperature Reviewed

Koji Asaka and Yahachi Saito

Surface and Interface Analysis   48   1203 - 1205   2016

Spontaneous graphenization of amorphous carbon on clean surfaces of nanometer-sized nickel particles at room temperature Reviewed

Koji Asaka and Yahachi Saito

Carbon   103   352 - 355   2016

Transformation of silicon nanoparticles on carbon nanotube heater to hollow graphitic nanocapsules via silicon carbide Reviewed

Koji Asaka, Tomohiro Terada, and Yahachi Saito

Diamond and Related Materials   50   49 - 54   2014

Synthesis and photophysics of quaterrylene molecules in single-walled carbon nanotubes: excitation energy transfer between a nanoscale cylinder and encapsulated molecules Reviewed

Takeshi Koyama, Takuya Tsunekawa, Takeshi Saito, Koji Asaka, Yahachi Saito, Hideo Kishida, and Arao Nakamura

The Journal of Physical Chemistry C   118   21671 - 21681   2014

In situ TEM study on changes in structure and electrical conductance of carbon nanotube-gold contact induced by local joule heating Reviewed

Motoyuki Karita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Journal of Materials Science   48   936 - 940   2013

Few-layer epitaxial graphene with large domains on C-terminated 6H-SiC Reviewed

Hailong Hu, Akkawat Ruammaitree, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

Surface and Interface Analysis   44   793 - 796   2012

Study on structure of heat-treated fullerene nanowhiskers and their field electron emission characteristics Reviewed

Koji Asaka, Tadachika Nakayama, Kun’ichi Miyazawa, and Yahachi Saito

Surface and Interface Analysis   44   780 - 783   2012

In situ TEM study on the improvement of contact resistance between a carbon nanotube and metal electrodes by local melting Reviewed

Motoyuki Karita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Surface and Interface Analysis   44   674 - 677   2012

Evolution of field electron emission pattern from multilayered graphene induced by structural change of edge Reviewed

Kazuya Nakakubo, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Applied Physics Express   5   055101-1-3   2012

Structures and field emission properties of heat-treated C60 fullerene nanowhiskers Reviewed

Koji Asaka, Tadachika Nakayama, Kun’ichi Miyazawa, and Yahachi Saito

Carbon   50   1209 - 1215   2012

Ultrafast energy transfer of one-dimensional excitons between carbon nanotubes: a femtosecond time-resolved luminescence study Reviewed

Takeshi Koyama, Yasumitsu Miyata, Koji Asaka, Hisanori Shinohara, Yahachi Saito, and Arao Nakamura

Physical Chemistry Chemical Physics   14   1070 - 1084   2012

Fabrication of gas field ion emitter by field induced oxygen etching method Reviewed

Yasushi Sugiura, Huarong Liu, Tatsuo Iwata, Shigekazu Nagai, Kazuo Kajiwara, Koji Asaka, Yahachi Saito, and Koichi Hata

e-Journal of Surface Science and Nanotechnology   9   344 - 347   2011

Graphitization of amorphous carbon on a multiwall carbon nanotube surface by catalyst-free heating Reviewed

Koji Asaka, Motoyuki Karita, and Yahachi Saito

Applied Physics Letters   99   091907-1-3   2011

Chirality assignment to carbon nanotubes integrated in MEMS by tilted-view transmission electron microscopy Reviewed

Matthias Muoth, Fabian Gramm, Koji Asaka, Lukas Durrer, Thomas Helbling, Cosmin Roman, Shih-Wei Lee, and Chiristofer Hierold

Sensors and Actuators B   154   155 - 159   2011

Joining of multiwall carbon nanotubes for the end-contact configuration by applying electric current Reviewed

Koji Asaka, Motoyuki Karita, and Yahachi Saito

Materials Letters   65   1832 - 1834   2011

Femtosecond luminescence decay due to exciton energy transfer in single-walled carbon nanotube bundles Reviewed

Takeshi Koyama, Koji Asaka, Naoki Hikosaka, Hideo Kishida, Yahachi Saito, and Arao Nakamura

Journal of Luminescence   131   494 - 497   2011

Ultrafast exciton energy transfer in bundles of single-walled carbon nanotubes Reviewed

Takeshi Koyama, Koji Asaka, Naoki Hikosaka, Hideo Kishida, Yahachi Saito, and Arao Nakamura

The Journal of Physical Chemistry Letters   2   127 - 132   2011

Modification of interface structure and contact resistance between a carbon nanotube and a gold electrode by local melting Reviewed

Koji Asaka, Motoyuki Karita, and Yahachi Saito

Applied Surface Science   257   2850 - 2853   2011

Enhancement of third-order optical nonlinearities in carbon nanotubes by encapsulated fullerenes Reviewed

Daksuke Hosooka, Takeshi Koyama, Hideo Kishida, Koji Asaka, Yahachi Saito, Takeshi Saito, and Arao Nakamura

AIP Conference Proceedings   1399   831 - 832   2011

Exciton energy transfer between single-walled carbon nanotubes in femtosecond regime Reviewed

Takeshi Koyama, Koji Asaka, Naoki Hikosaka, Hideo Kishida, Yahachi Saito, and Arao Nakamura

AIP Conference Proceedings   1399   759 - 760   2011

Field emission microscopy of Al-deposited carbon nanotubes: emission stability improvement and image of an Al atom cluster Reviewed

Yahachi Saito, Tomohiro Matsukawa, Koji Asaka, and Hitoshi Nakahara

Journal of Vacuum Science and Technology B   28   C2A5 - C2A8   2010

Electric and mass transport of a suspended multiwall carbon nanotube studied by in situ transmission electron microscopy Reviewed

Yasunobu Suzuki, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Japanese Journal of Applied Physics   49   02BD07-1-3   2010

Electric and mass transport of a carbon nanotube encapsulating a copper nano-rod studied by in-situ transmission electron microscopy Reviewed

Fumitaka Kimura, Koji Asaka, Hitoshi Nakahara, Fumio Kokai, and Yahachi Saito

Journal of Nanoscience and Nanotechnology   10   3907 - 3909   2010

Tilted-view transmission electron microscopy-access for chirality assignment to carbon nanotubes integrated in MEMS Reviewed

Matthias Muoth, Fabian Gramm, Koji Asaka, Lukas Durrer, Thomas Helbling, Cosmin Romana, Shih-Wei Lee, and Chiristofer Hierold

Procedia Chemistry   1   601 - 604   2009

The toughness of multi-wall carbon nanocapsules Reviewed

Koji Asaka, Kun’ichi Miyazawa, and Tokushi Kizuka

Nanotechnology   20   385705-1-4   2009

Nanowelding of a multiwalled carbon nanotube to metal surface and its electron field emission properties Reviewed

Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Applied Physics Letters   92   023114-1-3   2008

Fracture surface and correlation of buckling force with aspect ratio of C60 crystalline whiskers Reviewed

Koji Asaka, Ryoei Kato, Ryozo Yoshizaki, Kun’ichi Miyazawa, and Tokushi Kizuka

Diamond and Related Materials   16   1936 - 1939   2007

Conductance of carbon nanocapsule junctions Reviewed

Koji Asaka, Ryoei Kato, Ryozo Yoshizaki, Kun’ichi Miyazawa, and Tokushi Kizuka

Physical Review B   76   113404-1-3   2007

Deformation of multiwalled nanometer-sized carbon capsules Reviewed

Koji Asaka, Ryoei Kato, Kun’ichi Miyazawa, and Tokushi Kizuka

Applied Physics Letters   89   191914-1-3   2006

In situ high-resolution transmission electron microscopy of elastic deformation and fracture of nanometer-sized fullerene C60 whiskers Reviewed

Ryoei Kato, Koji Asaka, Kun’ichi Miyazawa, and Tokushi Kizuka

Japanese Journal of Applied Physics   45   8024 - 8026   2006

Buckling of C60 whiskers Reviewed

Koji Asaka, Ryoei Kato, Kun’ichi Miyazawa, and Tokushi Kizuka

Applied Physics Letters   89   071912-1-3   2006

Light-emitting filaments composed of nanometer-sized carbon hollow capsules Reviewed

Koji Asaka, Ryoei Kato, Yoshinari Maezono, Ryozo Yoshizaki, Kun’ichi Miyazawa, and Tokushi Kizuka

Applied Physics Letters   88   051914-1-3   2006

Measurements of the atomistic mechanics of single crystalline silicon wires of nanometer width Reviewed

Tokushi Kizuka, Yasuhiro Takatani, Koji Asaka, and Ryozo Yoshizaki

Physical Review B   72   035333-1-6   2005

Atomistic dynamics of deformation, fracture, and joining of individual single-walled carbon nanotubes Reviewed

Koji Asaka and Tokushi Kizuka

Physical Review B   72   115431-1-5   2005

Direct observation of excitonic lasing from single ZnO nanobelts at room temperature Reviewed

Kazuki Bando, Taiki Sawabe, Koji Asaka, and Yasuaki Masumoto

AIP Conference Proceedings   772   894 - 895   2004

Room-temperature excitonic lasing from ZnO single nanobelts Reviewed

Kazuki Bando, Taiki Sawabe, Koji Asaka, and Yasuaki Masumoto

Journal of Luminescence   108   385 - 388   2004

Transmission electron microscopy and electron diffraction studies on martensitic transformations in nanometer-sized particles of Au-Cd alloys of near-equiatomic compositions Reviewed

Koji Asaka, Tsugio Tadaki, and Yoshihiko Hirotsu

Philosophical Magazine A   82   463 - 478   2002

Structure of nanometer-sized Au-Cd alloy particles near equiatomic compositions at room temperature Reviewed

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

Materials Science and Engineering A   312   232 - 236   2001

Structure and displacive phase transformations of small particles of In-Pb alloys Reviewed

Koji Asaka, Eri Kitahata, Yoshihiko Hirotsu, Kouichi Kifune, Yoshiki Kubota, and Tsugio Tadaki

Scripta Materialia   44   2043 - 2046   2001

Facets of nanometer-sized Fe-Ni alloy particles and their change upon the martensitic transformation Reviewed

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

Materials Science Forum   327-328   409 - 412   2000

Lattice softening and Its relation to the martensitic transformation in nanometer-sized particles of Fe-Ni alloys Reviewed

Koji Asaka, Yoshihiko Hirotsu, and Tugio Tadaki

Solid-Solid Phase Transformations, Japan Institute of Metals   Pts1 and 2   1068 - 1071   1999

Martensitic transformation in nanometer-sized particles of Fe-Ni alloys Reviewed

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

Materials Science and Engineering A   273-275   262 - 265   1999

Transmission electron microscopy and electron diffraction study on structure and phase transformation of nanometer-sized Fe-15-30 at.% Ni alloy particles Reviewed

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

Journal of Electron Microscopy   48   387 - 391   1999

TEM and electron diffraction on structure and phase transformation of nanometer-sized Fe-Ni alloy particles Reviewed

Koji Asaka, Tsugio Tadaki, Yoshihisa Sechi, Bian Bo, Tadakatsu Ohkubo, and Yoshihiko Hirotsu

The Third Pacific Rim International Conference on Advanced Materials and Processing, Minerals, Metals & Materials Society   1   1467 - 1473   1998

Strategy for optimization of writing light in azobenzene-based reversible optical recording materials International conference

Keisuke Hamajima, Taiki Kasamatsu, Takeshi Koyama, Koji Asaka, Takeshi Saito, and Hideo Kishida

2018 KJF International Conference on Organic Materials for Electronics and Photonics (KJF-ICOMEP 2018)  2018.9 

Local structures and electronic properties of metal halide encapsulated single-walled carbon nanotubes International conference

Hironori Ogata, Eita Yokokura, Yosuke Kataoka, Koji Asaka, Yuuto Kawai, and Yahachi Saito

19th International Conference on the Science and Application of Nanotubes and Low-Dimensional Materials (NT18)  2018.7 

Bulk synthesis of linear carbon-chains confined inside single-wall carbon nanotubes by vacuum discharge International conference

Satoshi Toma, Koji Asaka, Masaru Irita, and Yahachi Saito

11th International Symposium on Atomic Level Characterizations for New Materials and Devices ’17 (ALC’ 17)  2017.12 

Field emission and field ion microscope images reflecting electronic orbitals of a graphene edge International conference

Toru Hoshino, Yudai Watanabe, Masaru Irita, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

International Conference on Materials and Systems for Sustainability 2017 (ICMaSS 2017)  2017.9 

Development of desktop high-resolution X-ray microscope with a single carbon nanotube emitter International conference

Shintaro Yamazaki, Masaru Irita, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

International Conference on Materials and Systems for Sustainability 2017 (ICMaSS 2017)  2017.9 

In-situ TEM study on structural changes of a multiwall carbon nanotube under applying an electrical current International conference

Kentaro Yamauchi, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

International Conference on Materials and Systems for Sustainability 2017 (ICMaSS 2017)  2017.9 

In-situ TEM study on structural change and light emission of a multiwall carbon nanotube duaring Joule heating International conference

Koushi Nishikawa, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

EMAS 2017 Workshop - 15th European Workshop on Modern Developments and Applications in Microbeam Analysis and IUMAS-7 Meeting - 7th Meeting of the International Union of Microbeam Analysis Societies  2017.5 

Development of high-resolution desktop FE-SEM with multi-walled carbon nanotube electron source International conference

Masaru Irita, Shintaro Yamazaki, Hitoshi Nakahara, Koji Asaka, Yahachi Saito, Hidekazu Murata, and Teruaki Ohno

International Symposium on Carbon Nanotube in Commemoration of its Quarter-century Anniversary (CNT25)  2016.11 

Structure change and light emission of a multiwall carbon nanotube during Joule heating International conference

Koji Asaka, Koushi Nishikawa, and Yahachi Saito

International Symposium on Carbon Nanotube in Commemoration of its Quarter-century Anniversary (CNT25)  2016.11 

Self-oscillation of a carbon nanotu be field emitter studied by in situ transmission electron microscopy International conference

Tomonori Kato, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

Seventeenth International Conference on the Science and Application of Nanotubes and Low-Dimensional Materials (NT16)  2016.8 

In situ SEM/STM observations and growth control of monolayer graphene on SiC (0001) wide terraces International conference

Chenxing Wang, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

10th International Symposium on Atomic Level Characterizations for New Materials and Devices ’15 (ALC’15)  2015.10 

Graphitization of amorphous carbon on Ni nanoparticles with clean surfaces International conference

Koji Asaka and Yahachi Saito

10th International Symposium on Atomic Level Characterizations for New Materials and Devices ’15 (ALC’15)  2015.10 

In situ TEM study on structural and electric conduction properties of a multiwall carbon nanotube connected to a Mo electrode International conference

Yuji Shinomiya, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

10th International Symposium on Atomic Level Characterizations for New Materials and Devices ’15 (ALC’15)  2015.10 

Field emission patterns showing symmetry of electronic states in graphene edges International conference

Noboru Yokoyama, Kazuya Nakakubo, Kohji Iwata, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

10th International Symposium on Atomic Level Characterizations for New Materials and Devices ’15 (ALC’15)  2015.10 

Fabrication of monolayer graphene on wide SiC terraces; an approach to produce pit-free and step-free graphene surfaces International conference

Chenxing Wang, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

The 16th International Conference on the Science and Application of Nanotubes (NT15)  2015.6 

Characteristic field emission images reflecting atomic-scale structures in multilayered graphene electron emitters International conference

Yahachi Saito, Noboru Yokoyama, Yuto Kawai, Kohji Iwata, Kazuya Nakakubo, Koji Asaka, and Hitoshi Nakahara

The 16th International Conference on the Science and Application of Nanotubes (NT15)  2015.7 

Field emission properties of TiO2 coated CNT studied by in-situ transmission electron microscopy International conference

Masahiro Matsuda, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

The 16th International Conference on the Science and Application of Nanotubes (NT15)  2015.7 

Changes in structure and composition of Si nanoparticles on a multiwall carbon nanotube at high temperatures International conference

Koji Asaka, Tomohiro Terada, and Yahachi Saito

The 16th International Conference on the Science and Application of Nanotubes (NT15)  2015.6 

In situ TEM study on electric transfer in a multiwall carbon nanotube; contact formation with a metal electrode and inter-shell conductance International conference

Yuji Shinomiya, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

The 16th International Conference on the Science and Application of Nanotubes (NT15)  2015.6 

Transformation of silicon nanoparticles on a carbon nanotube heater into hollow graphitic nanocapsules via silicon carbide International conference

Koji Asaka, Tomohiro Terada, and Yahachi Saito

International Symposium on New Movements of Electron Microscopy for the Next Generation  2015.3 

Ultrafast excitation energy transfer from encapsulated quaterrylene to single-walled carbon nanotube International conference

Takeshi Koyama, Takuya Tsunekawa, Takeshi Saito, Koji Asaka, Yahachi Saito, Hideo Kishida, and Arao Nakamura

17th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter (ICL2014)  2014.7 

Field emission from nanocarbon materials and their applications to electron beam devices International conference

Yahachi Saito, Hitoshi Nakahara, Koji Asaka, Kazuya Nakakubo, and Shunsuke Ichikawa

The World Conference on Carbon (Carbon2014)  2014.7 

In situ TEM study on electric properties of a junction between carbon nanotubes and a gold nanoparticle International conference

Motoyuki Karita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

9th International Symposium on Atomic Level Characterizations for New Materials and Devices ’13 (ALC’13)  2013.12 

Dynamic behaviour of multilayered graphene and metal-coated carbon nanotube field emitters International conference

Yahachi Saito, Kazuya Nakakubo, Tomohito Asai, and Koji Asaka

25th International Vacuum Nanoelectronics Conference (IVNC2012)  2012.7 

Research and development of carbon nanotube field emission devices International conference

Yahachi Saito, Hitoshi Nakahara, Koji Asaka, and Hideki Sato

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2012)  2012.6 

Optical functionality and exciton energy transfer in carbon nanotube-complex systems International conference

Arao Nakamura, Takeshi Koyama, Yasumitsu Miyata, Koji Asaka, Hisanori Shinohara, and Yahachi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2012)  2012.6 

Structure evolution from amorphous carbon to graphitic layers through glassy carbon on a carbon nanotube induced by Joule heating International conference

Koji Asaka, Motoyuki Karita, and Yahachi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2012)  2012.6 

Metal deposition effects on field emission from carbon nanotubes International conference

Hitoshi Nakahara, Huarong Liu, Tomohiro Matsukawa, Yuta Yamamoto, Kazuki Kato, Koji Iwata, Koji Asaka, and Yahachi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2012)  2012.6 

Improvement of electric conductance at the contact by embedding a carbon nanotube tip into a gold electrode International conference

Motoyuki Karita, Tomohiro Terada, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2012)  2012.6 

In-situ TEM and FEM study on field emission from exfoliated multilayered graphene International conference

Kazuya Nakakubo, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

International Symposium on Role of Electron Microscopy in Industry  2012.1 

In-situ TEM study on changes in structure and electrical conductance of carbon nanotube-metal contact induced by locale Joule heating International conference

Motoyuki Karita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

International Symposium on Role of Electron Microscopy in Industry  2012.1 

In-situ TEM study on structure and electrical resistance changes in a CNT-metal contact induced by local heating International conference

Motoyuki Karita, Koji Asaka, and Yahachi Saito

A3 Symposium on Emerging Materials: Nanomaterials for Energy and Environments  2011.10 

Fabrication of gas field ion emitter by field induced oxygen etching method in fixed high voltage International conference

Yasushi Sugiura, H. Liu, Tatsuo Iwata, Yasuhiko Sugiyama, Sigeichi Nagai, Kkazuo Kajiwara, Koichi Hata, Koji Asaka, and Yahachi Saito

8th International Symposium on Atomic Level Characterizations for New Materials and Devices ’11 (ALC’11)  2011.5 

Structure of heat-treated fullerene nanowhiskers and their field emission properties International conference

Koji Asaka, Tadachika Nakayama, Kun’ichi Miyazawa, and Yahachi Saito

8th International Symposium on Atomic Level Characterizations for New Materials and Devices ’11 (ALC’11)  2011.5 

In-situ TEM study on the improvement of contact resistance between a carbon nanotube and metal electrodes by local melting International conference

Motoyuki Karita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

8th International Symposium on Atomic Level Characterizations for New Materials and Devices ’11 (ALC’11)  2011.5 

Growth of large-scale domains of epitaxial graphene on C-face SiC International conference

Hailong Hu, Akkawat Ruammaitree, Hitoshi Nakahara, Koji Asaka, and Yahachi Saito

8th International Symposium on Atomic Level Characterizations for New Materials and Devices ’11 (ALC’11)  2011.5 

In-situ transmission electron microscopy of structural change of the contact between a carbon nanotube and gold by local Joule heating International conference

Motoyuki Karita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

2010 International Symposium on Micro-NanoMechatronics and Human Science (MHS 2010)  2010.11 

Exciton energy transfer between single-walled carbon nanotubes in femtosecond regime International conference

Takeshi Koyama, Koji Asaka, Yahachi Saito, Naoki Hikosaka, Hideo Kishida, and Arao Nakamura

30th International Conference on the Physics of Semiconductors (ICPS 2010)  2010.7 

Enhancement of third-order optical nonlinearities in carbon nanotubes by encapsulated fullerenes International conference

Daksuke Hosooka, Takeshi Koyama, Hideo Kishida, Koji Asaka, Yahachi Saito, Takeshi Saito, and Arao Nakamura

30th International Conference on the Physics of Semiconductors (ICPS 2010)  2010.7 

Femtosecond luminescence decay due to exciton energy transfer in single-walled carbon nanotube bundles International conference

Takeshi Koyama, Koji Asaka, Yahachi Saito, Naoki Hikosaka, Hideo Kishida, and Arao Nakamura

17th International Conference on Dynamical Processes in Excited States of Solids (DPC '10)  2010.6 

In-situ transmission electron microscopy of structural change of the contact between gold and a carbon nanotube International conference

Motoyuki Karita, Koji Asaka, and Yahachi Saito

International Workshop on Organic Electronics and Spintronics  2010.3 

In-situ TEM observation of joining of carbon nanotubes International conference

Koji Asaka, Motoyuki Karita, and Yahachi Saito

7th International Symposium on Atomic Level Characterizations for New Materials and Devices ’09 (ALC’09)  2009.12 

Tilted-view transmission electron microscopy-access for chirality assignment to carbon nanotubes integrated in MEMS International conference

Matthias Muoth, Fabian Gramm, Koji Asaka, Lukas Durrer, Thomas Helbling, Cosmin Romana, Shih-Wei Lee, and Chiristofer Hierold

Eurosensors XXIII conference (EuroSensors’09)  2009.9 

Field emission microscopy of Al-deposited carbon nanotubes: emission stability improvement and atomically-resolved image of an Al cluster International conference

Yahachi Saito, Tomohiro Matsukawa, Koji Asaka, and Hitoshi Nakahara

22nd International Vacuum Nanoelectronics Conference (IVNC2009)  2009.7 

In-situ TEM study on electric and mass transport of a copper nano-rod encapsulated in a carbon nanotube International conference

Yahachi Saito, Fumitaka Kimura, Koji Asaka, Hitoshi Nakahara, Fumio Kokai

NT09: Tenth International Conference on the Science and Application of Nanotubes  2009.6 

Third-order nonlinear optical response in fullerene-peapods International conference

Arao Nakamura, Daisuke Hosooka, Takeshi Koyama, Hideo Kishida, Koji Asaka, Yahachi Saito, and Takeshi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2009)  2009.6 

Electric and mass transport of a suspended multi-walled carbon nanotube studied by in situ transmission electron microscopy International conference

Yasunobu Suzuki, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2009)  2009.6 

Field Emission Microscopy Study on Methane and Ethane Adsorbed on CNT Field Emitters International conference

Tetsuya Yamashita, Koji Asaka, Hitoshi Nakahara, Sashiro Uemura, and Yahachi Saito

International Symposium on Carbon Nanotube Nanoelectronics (CNTNE2009)  2009.6 

Electric and mass transport of a copper nano-rod encapsulated in a carbon nanotube studied by in-situ transmission electron microscopy International conference

Fumitaka Kimura, Koji Asaka, Hitoshi Nakahara, Fumio Kokai, and Yahachi Saito

The IUMRS International Conference in Asia 2008 (IUMRS-ICA 2008)  2008.12 

Field emission microscopy of methane molecules adsorbed on multiwalled carbon nanotube field emitters International conference

Tetsuya Yamashita, Koji Asaka, Hitoshi Nakahara, S. Uemura, and Yahachi Saito

The 15th International Display Workshops (IDW’ 08)  2008.12 

Field emission microscopy of methane molecules adsorbed on multiwall carbon nanotube field emitters International conference

Tetsuya Yamashita, Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

The Seventh International Vacuum Electron Sources Conference (IVESC 2008)  2008.8 

In-situ TEM study on field emission from an isolated carbon nanotube: Field enhancement factor depending on gap length International conference

Yahachi Saito, Kensuke Okumura, and Koji Asaka

The Seventh International Vacuum Electron Sources Conference (IVESC 2008)  2008.8 

Field Emission from Metal-Deposited CNTs: Emission Stability improvement and Atomic Images of Metal Clusters International conference

Yahachi Saito, Tomohiro Matsukawa, Tetsuya Yamashita, Koji Asaka, Hitoshi Nakahara, and Sashiro Uemura

The 14th International Display Workshops (IDW’ 07)  2007.12 

Nano-welding of freestanding CNT on metal electrode and Its field emission properties International conference

Koji Asaka, Hitoshi Nakahara, and Yahachi Saito

The 14th International Display Workshops (IDW’ 07)  2007.12 

Field emission image of aluminum clusters deposited on carbon nanotubes International conference

Yahachi Saito, Tomohiro Matsukawa, Tetsuya Yamashita, Koji Asaka, and Hitoshi Nakahara

6th International Symposium on Atomic Level Characterizations for New Materials and Devices '07 (ALC’ 07)  2007.10 

In situ high-resolution transmission electron microscopy of deformation of multi-walled carbon nanometer-sized capsules International conference

Ryoei Kato, Koji Asaka, Kun’ichi Miyazawa and Tokushi Kizuka

2006 International Conference on Solid State Devices and Materials (SSDM2006)  2006.9 

Mechanical properties of nanometer-sized fullerene C60 whiskers studied by In situ high-resolution transmission electron microscopy International conference

Ryoei Kato, Koji Asaka, Kun’ichi Miyazawa, and Tokushi Kizuka

2006 International Conference on Solid State Devices and Materials (SSDM2006)  2006.9 

In-situ atomistic observation of electrical transport properties of amorphous carbon nanowhiskers by combined microscopy International conference

Ryoei Kato, Koji Asaka, Kun’ichi Miyazawa, and Tokushi Kizuka

First International Symposium on Nanometer-scale Quantum Physics (nanoPHYS'05)  2005.1 

In-situ atomistic microscopy of deformation of free-standing silicon rods International conference

Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

First International Symposium on Nanometer-scale Quantum Physics (nanoPHYS'05)  2005.1 

Atomistic structural dynamics of monatomic carbon wires studied by TEM-SPM combined microscopy International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

First International Symposium on Nanometer-scale Quantum Physics (nanoPHYS'05)  2005.1 

Effects of bias voltage on mechanical properties of silver nanocontacts International conference

Fei Deng, Koji Asaka, and Tokushi Kizuka

Joint Meeting of FIMS/ITS-NS/CTC/PLASMA-2004  2004.11 

Atomistic structural dynamics and electrical properties of individual single-walled carbon nanotubes studied by TEM-SPM combined microscopy International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

Joint Meeting of FIMS/ITS-NS/CTC/PLASMA-2004  2004.11 

Electrical transport properties of amorphous carbon nanowhiskers studied by combined atomistic microscopy International conference

Ryoei Kato, Koji Asaka, Kun’ichi Miyazawa, and Tokushi Kizuka

Joint Meeting of FIMS/ITS-NS/CTC/PLASMA-2004  2004.11 

Mechanical properties of nanometer-sized free-standing silicon rods studied by combined atomistic microscopy International conference

Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

Joint Meeting of FIMS/ITS-NS/CTC/PLASMA-2004  2004.11 

Mechanical properties of fullerene nanowhiskers studied by atomistic combined microscopy International conference

Ryoei Kato, Koji Asaka, Kun’ichi Miyazawa, and Tokushi Kizuka

International Symposium on Nano-organization and Function  2004.11 

In-situ atomistic combined microscopy of copper point contacts International conference

Tokushi Kizuka, Koji Asaka, Takafumi Sasaki, Satoru Fujisawa, and Akira Yabe

International Symposium on Nano-organization and Function  2004.11 

In-situ atomistic combined microscopy of silver and gold point contacts International conference

Fei Deng, Koji Asaka, and Tokushi Kizuka

International Symposium on Nano-organization and Function  2004.11 

In-situ atomistic combined microscopy of formation and mechanical properties of single-walled carbon nanotubes International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

International Symposium on Nano-organization and Function  2004.11 

In-situ atomistic combined microscopy of growth process of silicon nanowires by tip-contact International conference

Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

International Symposium on Nano-organization and Function  2004.11 

Direct observation of excitonic lasing from single ZnO nanobelts at room temperature International conference

Kazuki Bando, Taiki Sawabe, Koji Asaka, and Yasuaki Masumoto

27th International Conference on the Physics of Semiconductors (ICPS-27)  2004.7 

Direct atomistic observation of electromigration of Ag point contacts International conference

Fei Deng, Koji Asaka, and Tokushi Kizuka

The 9th International Symposium on Advanced Physical Field (APF-9), ”Characterization of Artificial Nanostructures and Nanomaterials”  2004.3 

Direct atomistic observation of tensile deformation and joining processes of isolated single-walled carbon nanotubes International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

The 9th International Symposium on Advanced Physical Field (APF-9), ”Characterization of Artificial Nanostructures and Nanomaterials”  2004.3 

Growth processes and electronic conductivity of individual silicon nanowires studied by TEM-SPM combined microscopy International conference

Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

The 9th International Symposium on Advanced Physical Field (APF-9), ”Characterization of Artificial Nanostructures and Nanomaterials”  2004.3 

Nanomaterial-handling of copper point contacts using in-situ atomistic microscopy International conference

Masanobu Mori, Koji Asaka, Satoru Fujisawa, Akira Yabe and Tokushi Kizuka

International Symposium on the Creation of Novel Nanomaterials (ISCNN’04)  2004.1 

Formation and mechanical properties of single-walled carbon nanotubes studied by in situ atomic microscopy International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

International Symposium on the Creation of Novel Nanomaterials (ISCNN’04)  2004.1 

Nanomaterial-handling of silver nano wire using in-situ atomistic microscopy International conference

Fei Deng, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

International Symposium on the Creation of Novel Nanomaterials (ISCNN’04)  2004.1 

Growth and structures of silicon nanowires studied by in-situ atomistic microscopy International conference

Tokushi Kizuka, Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa and Akira Yabe

International Symposium on the Creation of Novel Nanomaterials (ISCNN’04)  2004.1 

Atomistic structural dynamics and mechanical properties of individual single-walled carbon nanotubes studied by TEM-SPM combined microscopy International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

Joint Meeting of the 2nd International Symposium on "Future-oriented Interdisciplinary Materials Science" and the 1st International Tsukuba-Symposium on "NanoScience"(FIMS/ITSNs 2003)  2003.11 

Atomistic structural dynamics and electronic conductivity of individual copper point contacts studied by TEM-SPM combined microscopy International conference

Masanobu Mori, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

Joint Meeting of the 2nd International Symposium on "Future-oriented Interdisciplinary Materials Science" and the 1st International Tsukuba-Symposium on "NanoScience"(FIMS/ITSNs 2003)  2003.11 

Atomistic structural dynamics and mechanical properties of individual silver point contacts studied by TEM-SPM combined microscopy International conference

Fei Deng, Koji Asaka, and Tokushi Kizuka

Joint Meeting of the 2nd International Symposium on "Future-oriented Interdisciplinary Materials Science" and the 1st International Tsukuba-Symposium on "NanoScience"(FIMS/ITSNs 2003)  2003.11 

Atomistic structural dynamics of nucleation and growth processes of individual silicon nanowires studied by TEM-SPM combined microscopy International conference

Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

Joint Meeting of the 2nd International Symposium on "Future-oriented Interdisciplinary Materials Science" and the 1st International Tsukuba-Symposium on "NanoScience"(FIMS/ITSNs 2003)  2003.11 

Atomistic growth of isolated single-walled carbon nanotubes at nanocontacts between graphite surfaces International conference

Koji Asaka, Fei Deng, and Tokushi Kizuka

1st International Symposium on Active Nano-Characterization and Technology (ANCT2003)  2003.11 

Simultaneous observation of structure and conductance of Ag point contacts International conference

Fei Deng, Koji Asaka, and Tokushi Kizuka

1st International Symposium on Active Nano-Characterization and Technology (ANCT2003)  2003.11 

Preparation of self-standing silicon nanowires by nanometer tip contact International conference

Tokushi Kizuka, Yasuhiro Takatani, Koji Asaka, Satoru Fujisawa, and Akira Yabe

1st International Symposium on Active Nano-Characterization and Technology (ANCT2003)  2003.11 

Simultaneous observation of structure and conductance of nanometer-sized Cu contacts International conference

Masanobu Mori, Koji Asaka, Satoru Fujisawa, Akira Yabe, and Tokushi Kizuka

1st International Symposium on Active Nano-Characterization and Technology (ANCT2003)  2003.11 

Structure and displacive phase transformations of small particles of In-Pb alloys International conference

Koji Asaka, Eri Kitahata, Yoshihiko Hirotsu, Tsugio Tadaki, Kouichi Kifune, and Yoshiki Kubota

Fifth International Conference on Nanostructured Materials (Nano 2000)  2000.8 

HRTEM and XSAS study of melt spun amorphous NiTiZr ribbons International conference

J. Dutkiewicz, J. Morgiel, O. Kabisch, W. Gille, Y. Hirotsu and K. Asaka

3rd Japanese-Polish (Pol-Jpn) Joint Seminar on Materials Analysis  2000.7 

Lattice softening and Its relation to the martensitic transformation in nanometer-sized particles of Fe-Ni alloys International conference

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

International Conference on Solid-Solid Phase Transformations '99 (PTM-99)  1999.5 

Facets of nanometer-sized Fe-Ni alloy particles and their change upon the martensitic transformation International conference

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

International Symposium and Exhibition on Shape Memory Materials (SMM-99)  1999.5 

Martensitic transformation in nanometer-sized particles of Fe-Ni alloys International conference

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

International Conference on Martensitic Transformations (ICOMAT-98)  1998.12 

Transmission electron microscopy and electron diffraction studies on structure and phase transformation of nanometer-sized particles of Fe15-30at.% Ni alloys International conference

Koji Asaka, Yoshihiko Hirotsu, and Tsugio Tadaki

Symposium on High Voltage Electron Microscopy for 21st Century and Its Application to Frontier Materials Study (HVEM)  1998.10 

TEM and electron diffraction on structure and phase transformation of nanometer-sized Fe-Ni alloy particles International conference

Koji Asaka, Tsugio Tadaki, Yoshihisa Sechi, Bian Bo, Tadakatsu Ohkubo, and Yoshihiko Hirotsu

Third Pacific Rim International Conference on Advanced Materials and Processing (PRICM-3)  1998.7