炭素ナノチューブフローセンサー
Shankar Ghosh1, A K Sood, N Kumar
1Department of Physics, Indian Institute of Science, Bangalore 560 012, India.
Science (New York, N.Y.)
|January 18, 2003
まとめ
単一壁の炭素ナノチューブ上の液体の流れは,電圧を生成します. この電圧は,流れ速度に対する対数依存を示し,液体の性質に敏感であり,ナノチューブベースの流れセンサーとエネルギー変換装置の可能性を示唆しています.
科学分野:
- マテリアルサイエンス 材料科学
- ナノテクノロジー ナノテクノロジー
- 物理 物理学 物理学とは
背景:
- シングルウォールカーボンナノチューブ (SWCNT) は,ユニークな電気特性を持っています.
- 流体-ナノ材料の相互作用を理解することは,新しいデバイスの開発に不可欠です.
研究 の 目的:
- 液体の流れによるSWCNTバンドルの電圧発生を調査する.
- 流速,液体の性質,誘導電圧の関係を探求する.
- 基礎となる物理的メカニズムを解明し,デバイスの可能性を評価する.
主な方法:
- SWCNTバンドルサンプルの製造.
- SWCNTサンプルの上に様々な液体の制御された流れ.
- 流動方向に沿った誘導電圧の正確な測定.
- 液体のイオン伝導性と極性における系統的な変化.
主要な成果:
- SWCNTバンドルを通る液体の流れは,測定可能な電圧を誘導します.
- 誘導電圧は,60年間の流れ速度に対する対数依存を示している.
- 電圧の大きさは,液体のイオン伝導性と極性性質に非常に敏感です.
結論:
- 観測された非線形電圧生成は,液体の変動するクーロンビック場による電荷キャリアの直接的な強制に起因する.
- パルスする非対称なラチェットに基づいたモデルが,この現象を説明しています.
- SWCNTは,繊細なフローセンサーとして,エネルギー変換アプリケーションとして有望であることが示されています.
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