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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Carbon Nanotube Chemical and Mechanical Sensors
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Carbon Nanotube Chemical and Mechanical Sensors

机译：碳纳米管化学和机械传感器

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摘要

A single-walled carbon nanotube (SW-CNT) is a nano scale tube formed by a cylindrical shell of single atomic layer of carbon atoms. Nanotubes have diameter of a few nm and length up to 100μm so that they form extremely thin wires. The atomic structure of SW-CNT can be formed by wrapping a stripe of single atomic layer of graphite sheet along a certain direction, and this direction determines the diameter and chirality of the nanotubes. Experimental and theoretical studies have found that these nano-meter sized CNTs have novel electronic properties, which can be metallic or semiconducting, depending on their radius or chiralities. Nanotubes can be used as electronic wire between two metal electrodes as shown in Fig. 1, and the conductance between the electrodes can be measured as a function of the gate bias voltage. Since the nanotube electronic property is a strong function of its atomic structure, mechanical deformations or chemical doping can induce strong changes in conductance. Such changes can be easily detected by electron current signals, and these properties make CNTs extremely small sensors sensitive to their chemical and mechanical environments. In this paper, we present our theoretical and experimental studies on the subject of using SW-CNT as chemical and mechanical sensors.
机译：单壁碳纳米管（SW-CNT）是由碳原子单原子层的圆柱壳形成的纳米级管。纳米管的直径为几纳米，长度可达100μm，因此它们可以形成极细的线。 SW-CNT的原子结构可以通过沿一定方向包裹石墨片的单原子层的条带而形成，该方向决定了纳米管的直径和手性。实验和理论研究发现，这些纳米级CNT具有新颖的电子特性，取决于其半径或手性，它们可以是金属或半导体。纳米管可以用作两个金属电极之间的电子线，如图1所示，并且可以根据栅极偏置电压来测量电极之间的电导率。由于纳米管的电子特性与其原子结构密切相关，因此机械变形或化学掺杂会引起电导的强烈变化。可以通过电子电流信号轻松检测到此类变化，这些特性使CNT对化学和机械环境敏感的超小型传感器。在本文中，我们介绍了关于将SW-CNT用作化学和机械传感器的理论和实验研究。

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