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用于应变传感的纳米石墨烯薄膜的可调压阻特性。

Tunable piezoresistivity of nanographene films for strain sensing.

机构信息

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.

出版信息

ACS Nano. 2015 Feb 24;9(2):1622-9. doi: 10.1021/nn506341u. Epub 2015 Feb 6.

Abstract

Graphene-based strain sensors have attracted much attention recently. Usually, there is a trade-off between the sensitivity and resistance of such devices, while larger resistance devices have higher energy consumption. In this paper, we report a tuning of both sensitivity and resistance of graphene strain sensing devices by tailoring graphene nanostructures. For a typical piezoresistive nanographene film with a sheet resistance of ∼100 KΩ/□, a gauge factor of more than 600 can be achieved, which is 50× larger than those in previous studies. These films with high sensitivity and low resistivity were also transferred on flexible substrates for device integration for force mapping. Each device shows a high gauge factor of more than 500, a long lifetime of more than 10(4) cycles, and a fast response time of less than 4 ms, suggesting a great potential in electronic skin applications.

摘要

基于石墨烯的应变传感器最近受到了广泛关注。通常,这种器件的灵敏度和电阻之间存在权衡,而较大电阻的器件具有更高的能耗。在本文中,我们通过调整石墨烯纳米结构来调节石墨烯应变传感器件的灵敏度和电阻。对于典型的压阻纳米石墨烯薄膜,其方阻约为 100 KΩ/□,可实现超过 600 的应变系数,比以前的研究大 50 倍。这些具有高灵敏度和低电阻率的薄膜也被转移到柔性基底上,用于力映射的器件集成。每个器件的应变系数都超过 500,寿命超过 10^4 次循环,响应时间小于 4 ms,这表明其在电子皮肤应用方面具有巨大的潜力。

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