Bubble-Decorated Honeycomb-Like Graphene Film as Ultrahigh Sensitivity Pressure Sensors
Bubble-Decorated Honeycomb-Like Graphene Film as Ultrahigh Sensitivity Pressure Sensors
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DOI：
10.1002/adfm.201502960
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发表时间：
2015-11-04
影响因子：
19
通讯作者：
Fan, Zhuangjun
中科院分区：
文献类型：
--
作者：
Sheng, Lizhi;Liang, Yuan;Fan, Zhuangjun
最近，具有超低密度和良好导电性的大孔石墨烯整料（MGMs）由于其具有快速恢复速率的优异弹性而被认为是优异的压力传感器。然而，MGM仅在应变高于20%时才能表现出良好的灵敏度，这对于诸如人造皮肤的触摸型压力传感器是不期望的。在这里，展示了一种用于制造具有蜂窝状网络装饰的气泡的独立柔性石墨烯膜的创新方法。由于开关效应取决于“点对点”和“点对面”接触模式，石墨烯压力传感器在应变小于4%时具有161.6 kPa（-1）的超高灵敏度，比大多数先前报道的压力传感器高几百倍。此外，石墨烯压力传感器可以监测人体运动，例如手指弯曲和脉搏，其具有10 mV的非常低的操作电压，该电压足够低以允许通过能量收集设备（例如摩擦发电机）供电。因此，压力传感器的高灵敏度、低工作电压、长循环寿命和大规模制造使其成为制造低成本人工皮肤的有希望的候选者。
Recently, macroporous graphene monoliths (MGMs), with ultralow density and good electrical conductivity, have been considered as excellent pressure sensors due to their excellent elasticity with a rapid rate of recovery. However, MGMs can only exhibit good sensitivity when the strain is higher than 20%, which is undesirable for touch-type pressure sensors, such as artificial skin. Here, an innovative method for the fabrication of freestanding flexible graphene film with bubbles decorated on honeycomb-like network is demonstrated. Due to the switching effect depended on "point-to-point" and "point-to-face" contact modes, the graphene pressure sensor has an ultra-high sensitivity of 161.6 kPa(-1) at a strain less than 4%, several hundred times higher than most previously reported pressure sensors. Moreover, the graphene pressure sensor can monitor human motions such as finger bending and pulse with a very low operating voltage of 10 mV, which is sufficiently low to allow for powering by energy-harvesting devices, such as triboelectric generators. Therefore, the high sensitivity, low operating voltage, long cycling life, and large-scale fabrication of the pressure sensors make it a promising candidate for manufacturing low-cost artificial skin.