時間制御型プラズマCVDによる単層カーボンナノチューブの電気特性制御

2008 Fiscal Year Annual Research Report

• Project/Area Number: 20840003
• Research Institution: Tohoku University
• Principal Investigator: 加藤 俊顕 Tohoku University, 大学院・工学研究科, 助教 (20502082)
• Keywords: プラズマCVD / 単層カーボンナノチューブ / 構造制御 / 蛍光特性

Research Abstract

本年度は, 単層カーボンナノチゴーブ(SWNTs)の螺旋度(カイラリティ)とSWNTsの成長時間に関する相関を明らかにする目的で実験を行った. その結果, 成長したままの基板上の試料からの蛍光特性を直接観測することに成功した. 通常, カイラリティを特定することが可能な蛍光特性を測定するには, 化学的処理によりSWNTsを溶液中に孤立分散することが必要である, 分散効率の直径, カイラリティ依存性が報告されているため, 溶液中に分散した試料内の正確なカイラリティ分布の測定は困難であった. 本手法により成長したSWNTsは, あらかじめ孤立垂直配向形状を有しているため, 分散行程を必要とせず, 成長した試料本来のカイラリティ分布を蛍光特性から見積もることができる. この成果は極めて重要と言える. 次に, 本手法を用いて試料内のカイラリティ分布とプラズマ照射時間の相関を検討した結果, プラズマ照射時間を短くしていくにつれ, つまりSWNTsの成長時間が短くなるにつれて, 試料内のSWNTsのカイラリティ分布が狭まることが明らかとなった. この結果は, 成長初期では直径の小さなSWNTsが, その後直径の大きなSWNTsが成長する機構に基付いていると考えられる. 直径の小さなSWNTsに関レては, SWNTs先端のキーヤップ構造の安定性から安定に存在できるカイラリティ数が限られている. つまり成長時間制御により直径の小さなSWNTsのみを優先的に成長させたことで, 結果的に試料内のカイラリティばらつきが抑制できたと考えられる. カイラリティにより金属にも半導体にもなるSWNTsの特徴を考慮すると, この様な極端にカイラリティばらつきの少ない試料は, SWNTsのデバイス応用に向けて極めて有用である.

Research Products

• [Journal Article] Effect of gold catalytic layer thickness on growth of single walled carbon nanotubes using thermal and plasma CVD (2009)
  • Author(s): Z. Ghorannevis
  • Journal Title: Journal of Plasma and Fusion Research Series (印刷中)
  • Peer Reviewed
• [Journal Article] Growth kinetics of single walled carbon nanotubes in plasma and thermal CVD with non magnetic catalysts (2009)
  • Author(s): Z. Ghorannevis
  • Journal Title: Proceedings of Plasma Science Symposium / The 26th Symposium on Plasma Processing Pages: 20-21
  • Peer Reviewed
• [Journal Article] プラズマイオン制御によるカルシウム内包カーボンナノチューブの創製 (2009)
  • Author(s): T. Shimizu
  • Journal Title: Proceedings of Plasma Science Symposium/The 26th Symposium on Plasma Processing Pages: 34-35
  • Peer Reviewed
• [Journal Article] Exciton energy transfer assisted photoluminescence brightening from freestanding single-walled carbon nanotube bundles (2008)
  • Author(s): T. Kato
  • Journal Title: Journal of the American Chemical Society 130 Pages: 8101-8107
  • Peer Reviewed
• [Journal Article] Modification of Electrical Transport Properties of Single-Walled Carbon Nanotubes Realized by Negative-Ion Irradiation with Electron-Free Pure Alkali-Halogen Plasma (2008)
  • Author(s): J. Shishido
  • Journal Title: Japanese Journal of Applied Physics 47 Pages: 2044-2047
  • Peer Reviewed
• [Journal Article] Novel-structured carbon nanotubes creation by nanoscopic plasma control (2008)
  • Author(s): R. Hatakeyama
  • Journal Title: Plasma Source Science and Technology 17 Pages: 024009-1-11
  • Peer Reviewed
• [Journal Article] Nanodevice-Oriented Nanoscopic Plasma Process Control (2008)
  • Author(s): R. Hatakeyama
  • Journal Title: Proceedings of the 2nd International Symposium on Information Electronics Systems Pages: 66-71
  • Peer Reviewed
• [Journal Article] Growth of carbon nanotubes using plasma CVD over gold catalyst (2008)
  • Author(s): Z. Ghorannevis
  • Journal Title: Proceedings of the International Interdisciplinary-Simposium on Gaseous and Liquid Plasmas Pages: 175-178
  • Peer Reviewed
• [Journal Article] Formation of Calcium Encapsulated Single-Walled Carbon Nanotubes Via Calcium Plasma Ion Irradiation (2008)
  • Author(s): T. Shimizu
  • Journal Title: Proceedings of International Interdisciplinary-Symposium on Gaseous and Liquid Plasmas Pages: 143-146
  • Peer Reviewed
• [Journal Article] Gas pressure effects on the structure of single-walled carbon nanotube grown with diffusion plasma CVD (2008)
  • Author(s): S. Kuroda
  • Journal Title: Proceedings of International Interdisciplinary-Symposium on Gaseous and Liquid Plasmas Pages: 171-174
  • Peer Reviewed
• [Journal Article] Gold Catalyzing growth of Single walled carbon nanotubes using chemical vapor deposition method (2008)
  • Author(s): Z. Ghorannevis
  • Journal Title: Proceedings of the First Student Organizing International Mini-Conference on Information Electronics Systems Pages: 17
• [Journal Article] Growth of single-walled carbon nanotubes using different catalysts with plasma and thermal CVD (2008)
  • Author(s): Z. Ghorannevis
  • Journal Title: Proceedings of the 1st International Conference on Plasma-Nanotechnology & Science Pages: 42-43
  • Peer Reviewed
• [Presentation] Diameter control of single-walled carbon nanotubes grown by diffusion plasma CVD (2009)
  • Author(s): S. Kuroda
  • Organizer: The 36th Fullerene-Nanotubes General Symposium
  • Place of Presentation: Nagoya
  • Year and Date: 2009-03-04
• [Presentation] Comparison of thermal and plasma CVD for the growth of single walled carbon nanotubes from nonmagnetic nanoparticles (2009)
  • Author(s): Z. Ghorannevis
  • Organizer: The 36th Fullerene-Nanotubes General Symposium
  • Place of Presentation: Nagoya
  • Year and Date: 2009-03-02
• [Presentation] Fabrication of The Air Stable n-type Single-Walled Carbon Nanotube Transistor based on Calcium Atoms Encapsulation (2009)
  • Author(s): T. Shimizu
  • Organizer: The 36th Fullerene-Nanotubes General Symposium
  • Place of Presentation: Nagoya
  • Year and Date: 2009-03-02
• [Presentation] プラズマ科学基盤のナノエレクトロニクス的新機能性CNT創製 (2009)
  • Author(s): R. Hatakeyama
  • Organizer: 第1回静岡大学True Nanoシンポジウム
  • Place of Presentation: 焼津市
  • Year and Date: 2009-02-28
• [Presentation] Transistor Fabrication and Electronic Transport Property of Calcium Encapsulated Single-Walled Carbon Nanotubes Created by Plasma Ion Irradiation (2009)
  • Author(s): T. Shimizu
  • Organizer: Plasma Science Symposium/The 26th Symposium on Plasma Processing
  • Place of Presentation: Nagoya
  • Year and Date: 2009-02-02
• [Presentation] Creation and Properties of Inner-Nanospace Controlled Carbon Nanotubes (2008)
  • Author(s): R. Hatakeyama, T. Kaneko, Y. F. Li, T. Kato
  • Organizer: France-Tohoku Workshop
  • Place of Presentation: Sendai
  • Year and Date: 2008-12-12