The sandwich structure flexible capacitive pressure sensor was designed.The sensor adopted polydimethylsiloxane(PDMS)as flexible substrate,silver nanowires as the electrode material,and PDMS as dielectric layer,in addition,the substrate was made by two kinds of structures,the obscured glass substrate with micro-nano structured surface and the smooth glass substrate without micro-nano structured surface,as effective moulds for construction of flexible PDMS thin films.We laminated the two AgNWs/PDMS films together,face-to-face,with another PDMS as dielectric layer,to obtain the capacitive strain sensor,and then study the influence of micro-nano structure on the sensor sensitivity.And the sensitivity of micro-structured AgNWs/PDMS composite sensor was about 1.0 kPa-1,while the sensitivity of flat structured sensor was about 0.6 kPa-1.Research has shown that micro-nano structured electrode can effectively improve the sensitivity of the device.%设计制备出三明治结构的电容式柔性压力传感器,并对其性能进行研究.该传感器以银纳米线为电极材料,聚二甲基硅氧烷(PDMS)为柔性衬底,同时采用毛面玻璃和光面玻璃分别作为柔性衬底的制备模板,制备出微纳结构和平面结构的PDMS薄膜.然后采用喷涂法制备AgNWs/PDMS复合电极,以另外一层PDMS为介电层,将两电极面对面封装,得到电容式柔性压力传感器,最后系统研究了传感器的电极微纳结构对器件性能的影响.本文研究表明,具有微纳结构的AgNWs/PDMS复合薄膜传感器的灵敏度为1.0 kPa-1,而平面结构的AgNWs/PDMS复合薄膜传感器的灵敏度为0.6 kPa-1,由此可知具有微纳结构的柔性衬底能够显著提高器件的灵敏度.
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