材料科学
石墨烯
复合材料
压阻效应
复合数
渗流阈值
弯曲
灵敏度(控制系统)
硅酮
压力传感器
环氧树脂
抗弯刚度
纳米技术
机械工程
电阻率和电导率
电子工程
电气工程
工程类
作者
Ningqi Luo,Yan Huang,Jing Liu,Shih‐Chi Chen,C.P. Wong,Ni Zhao
标识
DOI:10.1002/adma.201702675
摘要
A versatile flexible piezoresistive sensor should maintain high sensitivity in a wide linear range, and provide a stable and repeatable pressure reading under bending. These properties are often difficult to achieve simultaneously with conventional filler-matrix composite active materials, as tuning of one material component often results in change of multiple sensor properties. Here, a material strategy is developed to realize a 3D graphene-poly(dimethylsiloxane) hollow structure, where the electrical conductivity and mechanical elasticity of the composite can be tuned separately by varying the graphene layer number and the poly(dimethylsiloxane) composition ratio, respectively. As a result, the sensor sensitivity and linear range can be easily improved through a decoupled tuning process, reaching a sensitivity of 15.9 kPa-1 in a 60 kPa linear region, and the sensor also exhibits fast response (1.2 ms rising time) and high stability. Furthermore, by optimizing the density of the graphene percolation network and thickness of the composite, the stability and repeatability of the sensor output under bending are improved, achieving a measurement error below 6% under bending radius variations from -25 to +25 mm. Finally, the potential applications of these sensors in wearable medical devices and robotic vision are explored.
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