Carbon nanotube flow sensors
Carbon nanotube flow sensors
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DOI：
10.1126/science.1079080
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发表时间：
2003-02-14
期刊：
影响因子：
56.9
通讯作者：
Kumar, N
中科院分区：
文献类型：
--
作者：
Ghosh, S;Sood, AK;Kumar, N
我们报道，液体在单次等待的碳纳米管束上的流动在样品中沿着流动的方向感应电压。在近60年的速度中，产生的电压符合对数速度依赖关系。电压的大小敏感地取决于离子电导率和液体的极性。我们的测量表明，导致这种高度非线性响应的主要机制是，流经纳米管的液体的波动库仑磁场直接迫使纳米管中的自由电荷载流子。提出了一种基于脉动不对称棘轮的解释。我们的工作突出了纳米管作为灵敏的流量传感器和能量转换的器件潜力。
We report that the flow of a liquid on single-waited carbon nanotube bundles induces a voltage in the sample along the direction of the flow. The voltage that was produced fit a logarithmic velocity dependence over nearly six decades of velocity. The magnitude of the voltage depended sensitively on the ionic conductivity and on the polar nature of the liquid. Our measurements suggest that the dominant mechanism responsible for this highly nonlinear response involves a direct forcing of the free charge carriers in the nanotubes by the fluctuating Coutombic field of the liquid flowing past the nanotubes. We propose an explanation based on pulsating asymmetric ratchets. Our work highlights the device potential for nanotubes as sensitive flow sensors and for energy conversion.