Piezoresistive behavior study on finger-sensing silicone rubber/graphite nanosheet nanocomposites
Piezoresistive behavior study on finger-sensing silicone rubber/graphite nanosheet nanocomposites
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DOI：
10.1002/adfm.200600519
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发表时间：
2007-04-16
影响因子：
19
通讯作者：
Lu, Liang
中科院分区：
文献类型：
--
作者：
Chen, Ling;Chen, Guohua;Lu, Liang
通过将导电石墨纳米片（GNs）均匀分散在硅橡胶（SR）基体中，成功制备了一种具有显著可逆压阻效应的新型纳米指敏复合材料。由于石墨纳米片的高纵横比，纳米复合材料显示出非常低的逾渗阈值。导电纳米片体积分数最接近逾渗阈值的SR/GN纳米复合材料在很低的压力下，即在指压范围内，呈现出明显的正压力系数效应（0.3-0.7 MPa），由此纳米复合材料的突变过渡行为由隧道传导理论的扩展解释，该理论提供了纳米复合材料的突变过渡行为的良好近似。压阻效应
A novel finger-sensing nanocomposite with remarkable and reversible piezoresistivity is successfully fabricated by dispersing homogeneously conductive graphite nanosheets (GNs) in a silicone rubber (SR) matrix. Because of the high aspect ratio of the graphite nanosheets, the nanocomposite displays a very low percolation threshold. The SR/GN nanocomposite with a volume fraction of conductive nanosheets closest to that for the percolation threshold presents a sharp positive-pressure coefficient effect of the resistivity under very low pressure, namely, in the finger-pressure range (0.3-0.7 MPa), whereby the abrupt transitive behavior of the nanocomposite is accounted for by an extension of the tunneling conduction theory which provides a good approximation of the piezoresistive effect.