カーボンナノチューブの電気伝導特性ひずみ依存性解明と超高感度ひずみセンサへの応用

• Project/Area Number: 12J03435
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Materials/Mechanics of materials
• Research Institution: Tohoku University
• Principal Investigator: 大西 正人 東北大学, 工学研究科, 特別研究員(DC1)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,000,000 (Direct Cost: ¥3,000,000); Fiscal Year 2014: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2013: ¥1,000,000 (Direct Cost: ¥1,000,000); Fiscal Year 2012: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: カーボンナノチューブ / ひずみ / 電子輸送特性 / タイトバインディング近似 / ひずみセンサ / 第一原理解析 / 状態密度分布 / 電気伝導度 / 非平衡グリーン関数法 / グラフェンナノリボン / 分子動力学

Outline of Annual Research Achievements

本課題の最終年度である本年度は，軸方向圧縮ひずみ負荷により屈曲変形したカーボンナノチューブ（CNT）の電子構造変化の予測手法を確立した．前年度までに，炭素原子のπ軌道の成す角（二面角）の変化により半径方向ひずみが負荷したCNTのバンドギャップ変化を予測できる見通しを得ていた．そこで本年度は，二面角と一様な半径方向ひずみを負荷したCNTのバンドギャップの関係を詳細に解析したところ，カイラリティによらず二面角が約30度付近から0.07 eV/度の割合でバンドギャップが減少することを明らかにした．また，独自に開発したtight-binding近似に基づく電子状態解析コードを用い各固有状態のσ-π軌道の混成度合いを解析した結果，CNTに半径方向ひずみが負荷すると伝導帯においてσ-π軌道が混成し，それによって曲率の高い領域の軌道の局在化，さらに状態エネルギーの減少が生じることを明らかにした．また，グリーン関数法を用いた電子輸送解析プログラムを開発し，軸方向圧縮ひずみを負荷したCNTの電子輸送特性変化を解析した．これにより，CNTの屈曲に伴い臨界値（30度）を超える二面角の数が急激に増加するため，屈曲部で軌道混成による電子散乱が増加し，CNTの電気抵抗が急激に増加することを明らかにした．一方で，CNT内部の欠陥の増加に伴い電気抵抗のひずみ感度が低下することから，CNTをひずみセンサとして応用するためには欠陥密度の制御が不可欠であることを明らかにした．これらの解析により二面角と分子動力学解析による構造解析を用いることで，CNTひずみ感度のカイラリティや欠陥依存性を定量的に予測できる見通しが得られた．これらの知見は，CNTの電子特性ひずみ依存性を応用したひずみセンサ作製やCNTデバイスの信頼性向上に活用されることが期待される．

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Quantitative Evaluation of Orbital Hybridization in Carbon Nanotubes Under Radial Deformation Using π-orbital Axis Vector (2015)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Journal Title: AIP Advances Volume: 5 Issue: 4
  • DOI: 10.1063/1.4918676
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Electronic Conductivity of Carbon Nanotubes Under Anisotropic Strain Field (2014)
  • Author(s): Masato Ohnishi, Meng Yang, Ken Suzuki, and Hideo Miura
  • Journal Title: Proceedings of ASME 2014 International Mechanical Engineering Congress and Exposition Volume: IMECE2014-39470 Pages: 1-6
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Spatial distribution of state densities dominating strain sensitivity of carbon nanotubes (2014)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Journal Title: Proceedings of 2014 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD) Volume: SISPAD2014 Pages: 165-168
  • DOI: 10.1109/sispad.2014.6931589
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Two-Dimensional Boundary Element Analysis of Edge Cracked Rectangular Plate Using Near-Tip Solution (2013)
  • Author(s): Masato Ohnishi, Hiroshi Kawakami, Ken Suzuki, and Hideo Miura
  • Journal Title: Journal of Computational Science and Technology Volume: 7 Issue: 3 Pages: 354-362
  • DOI: 10.1299/jcst.7.354
  • NAID: 130003368093
  • ISSN: 1881-6894
  • Peer Reviewed
• [Journal Article] EFFECT OF ANISOTROPIC STRAIN FIELD ON THE ELECTRONIC CONDUCTANCE OF CARBON NANOTUBEB (2013)
  • Author(s): Masato Ohnishi, Ken Suzuki and Hideo Miura
  • Journal Title: Proceedings of ASME 2013 International Mechanical Engineering Congress and Exposition IMECE2013 Volume: 2013-64487 Pages: 1-5
  • Peer Reviewed
• [Journal Article] Anisotropic strain-field-induced change of the electronic conductivity of graphene sheets and carbon nanotubes (2012)
  • Author(s): Masato Ohnishi, Hiroshi Kawakami, Yusuke Suzuki, Ken Suzuki, and Hideo Miura
  • Journal Title: Proc. of ASME 2012 International Mechanical Engineering Congress & Exposition (IMECE2012) Volume: 2012-87347 Pages: 1-6
  • Peer Reviewed
• [Presentation] 半径方向ひずみ負荷によるカーボンナノチューブの電気伝導特性変化 (2014)
  • Author(s): 大西正人，鈴木研，三浦英生
  • Organizer: 日本機械学会第27回計算力学講演会（CMD2014）
  • Place of Presentation: 岩手県，盛岡市
  • Year and Date: 2014-11-22 – 2014-11-24
• [Presentation] Change in Spatial Distribution of State Densities of Carbon Nanotubes Under Anisotropic Strain Field (2014)
  • Author(s): Masato Ohnishi, Meng Yang, Ken Suzuki, and Hideo Miura
  • Organizer: ASME 2014 International Mechanical Engineering Congress and Exposition(IMECE2014)
  • Place of Presentation: Montreal Convention Centre, Montreal, Canada
  • Year and Date: 2014-11-14 – 2014-11-20
• [Presentation] Electronic Conductivity of Carbon Nanotubes Under Anisotropic Strain Field (2014)
  • Author(s): Masato Ohnishi, Meng Yang, Ken Suzuki, and Hideo Miura
  • Organizer: ASME 2014 International Mechanical Engineering Congress and Exposition(IMECE2014)
  • Place of Presentation: Montreal Convention Centre, Montreal, Canada
  • Year and Date: 2014-11-14 – 2014-11-20
• [Presentation] Spatial Distribution of State Densities Dominating Strain Sensitivity of Carbon Nanotubes (2014)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Organizer: 2014 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD2014)
  • Place of Presentation: 神奈川県，横浜市
  • Year and Date: 2014-09-09 – 2014-09-11
• [Presentation] Development of Two-dimensional Tactile Sensor Using Carbon Nanotubes (2014)
  • Author(s): Masato Ohnishi, Meng Yang, Takuya Nozaki, Ken Suzuki, and Hideo Miura
  • Organizer: International Conference on Solid State Devices and Materials (SSDM2014)
  • Place of Presentation: 茨城県，筑波市
  • Year and Date: 2014-09-08 – 2014-09-11
• [Presentation] カーボンナノチューブ電気伝導特性のひずみ依存性 (2014)
  • Author(s): 大西正人，楊猛，鈴木研，三浦英生
  • Organizer: 日本機械学会M&M2014材料力学カンファレンス
  • Place of Presentation: 福島県，福島市
  • Year and Date: 2014-07-18 – 2014-07-21
• [Presentation] Electronic Conductance Change of Carbon Nanotubes Under Anisotropic Strain Field (2014)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Organizer: The 1^<st> INSA de Lyon-Tohoku Univ. Mini-Workshop
  • Place of Presentation: INSA Lyon, Lyon, France
  • Year and Date: 2014-02-24
• [Presentation] カーボンナノチューブ電子伝導特性のひずみ依存性解析とひずみセンサへの展開 (2014)
  • Author(s): 大西正人, 鈴木研, 三浦英
  • Organizer: グローバル大学院 安全・安心工学コース分野横断型シンポジウム
  • Place of Presentation: 宮城県仙台市
  • Year and Date: 2014-02-21
• [Presentation] 半径方向ひずみ負荷によるカーボンナノチューブの状態密度変化 (2014)
  • Author(s): 大西正人, 鈴木研, 三浦英生
  • Organizer: 第61回応用物理学会春季学術講演会
  • Place of Presentation: 青山学院大学相模原キャンパス, 神奈川県
• [Presentation] Change of the electronic properties of carbon nanotubes caused by three-dimensional strain field (2013)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Organizer: 16^<th> International Workshop on Computational Electronics IWCE2013
  • Place of Presentation: Nara, Japan
  • Year and Date: 2013-06-06
• [Presentation] Electrical Conductivity Change of Carbon Nanotubes under Deformation (2013)
  • Author(s): 大西正人
  • Organizer: The 1^<st> Tsinghua Univ.-Tohoku Univ. Mini-Workshop
  • Place of Presentation: Beijing, China
  • Year and Date: 2013-02-27
• [Presentation] Effect of Three-dimensional Strain Field on Electronic Conductivity of Carbon Nanotubes (2013)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Organizer: International Symposium for the 70th Anniversary of the Tohoku Branch of the Chemical Society of Japan
  • Place of Presentation: Kawauchi-Kita Campus, Tohoku University, Sendai, Japan
• [Presentation] カーボンナノチューブ電気伝導特性に及ぼす三次元ひずみ場の影響 (2013)
  • Author(s): 大西正人, 鈴木研, 三浦英生
  • Organizer: 日本機械学会M&M2013材料力学カンファレンス
  • Place of Presentation: 岐阜大学柳戸キャンパス, 岐阜県
• [Presentation] グラフェンナノリボン電気伝導特性に及ぼす三次元ひずみ場の影響 (2013)
  • Author(s): 大西正人, 楊猛, 鈴木研, 三浦英生
  • Organizer: 日本機械学会第26回計算力学講演会(CMD2013)
  • Place of Presentation: 佐賀大学本庄キャンパス,佐賀県
• [Presentation] Change of the Electronic Conductivity of Graphene Nanoribbons and Carbon Nanotubes Caused bv a Local Deformation (2013)
  • Author(s): Masato Ohnishi, Ken Suzuki, and Hideo Miura
  • Organizer: 18th International of Conference on Simulation Semiconductor Processes and Devices (SISPAD2013)
  • Place of Presentation: Glasgow, Scotland, UK
• [Presentation] EFFECT OF ANISOTROPIC STRAIN FIELD ON THE ELECTRONIC CONDUCTANCE OF CARBON NANOTUBES (2013)
  • Author(s): Masato Ohnishi, Ken Suzuki and Hideo Miura
  • Organizer: ASME 2013 International Mechanical Engineering Congress and Exposition IMECE2013
  • Place of Presentation: Manchester Grand Hyatt San Diego, California, USA
• [Presentation] グラフェン電気伝導性のひずみ依存性 (2013)
  • Author(s): 楊猛, 大西正人, 鈴木研, 三浦英生
  • Organizer: 日本機械学会M&M2013材料力学カンファレンス
  • Place of Presentation: 岐阜大学柳戸キャンパス, 岐阜県
• [Presentation] Strain-induced Change of Electronic Conductivity of Graphene Sheets and Nano-Ribbon (2013)
  • Author(s): Meng Yang, Masato Ohnishi, Ken Suzuki, Hideo Miura
  • Organizer: EMAP2013 15th International Conference on Electronic Materials and Packing
  • Place of Presentation: KINTEX, Goyang-si, Korea
• [Presentation] Highly Sensitive 2D Strain Sensor using Carbon Nanotube (2013)
  • Author(s): Hiroshi Kawakami, Masato Ohnishi, Ken Suzuki, Hideo Miura
  • Organizer: ASME2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK2013)
  • Place of Presentation: Hyatt Regency San Francisco Airport Hotel, Burlingame, California, USA
• [Presentation] カーボンナノチューブの電気伝導特性に及ぼす局所ひずみ分布の影響 (2012)
  • Author(s): 大西正人
  • Organizer: 日本機械学会 第25回計算力学講演会(CMD2012)
  • Place of Presentation: 甲南大学ポートアイランドキャンパスFIBER
  • Year and Date: 2012-10-06
• [Presentation] Change of the Electronic Conductivity of CNTs Caused by a Three-dimensional Strain Field (2012)
  • Author(s): 大西正人
  • Organizer: 2012 International Conference on Solid State Devices and Materials
  • Place of Presentation: 国立京都国際会館
  • Year and Date: 2012-09-27
• [Presentation] Change of the Electronic Conductivity of CNTs and Graphene Sheets Caused by a Three-dimensional Strain Field (2012)
  • Author(s): 大西正人
  • Organizer: The International Conference on Simulation of Semiconductor Processes and Devices SISPAD 2012
  • Place of Presentation: Denver, Colorado, USA
  • Year and Date: 2012-09-06
• [Presentation] Anisotropic Strain-Field-Induced Change of The Electronic Conductivity of Graphene Sheets And Carbon Nanotubes (2012)
  • Author(s): 大西正人
  • Organizer: ASME 2012 International Mechanical Engineering Congress & Exposition (IMECE2012)
  • Place of Presentation: Houston, Texas, USA
• [Remarks] 東北大学三浦研究室ホームページ
  • URL: http://www.miura.rift.mech.tohoku.ac.jp/
• [Remarks]
  • URL: http://www.miura.rift.mech.tohoku.ac.ip/academy_jp.htm
• [Remarks]
  • URL: http://www.miura.rift.mech.tohoku.ac.jp/home.htm