聚乙烯醇/石墨烯纳米复合材料的电阻式应变传感性能研究
Study on Resistive Strain Sensing Performance of Polyvinyl Alcohol/ Graphene Nanocomposites
以聚乙烯醇(PVA)为基体,以还原氧化石墨烯(rGO)为导电填料,采用溶液共混-流延成膜法制备PVA/rGO纳米复合薄膜。对复合薄膜的结构与热学性能进行表征,系统考察rGO含量对复合材料力学性能、导电性能及电阻式应变传感性能的影响。结果表明:rGO在PVA基体中能够形成均匀的导电网络。当rGO质量分数为2.0%时,复合薄膜的导电渗滤阈值约为0.75%,拉伸强度达到65.2 MPa,应变灵敏系数在0~10%应变范围内为5.5,在10%~50%应变范围内可达18.0。经500次拉伸循环测试后,信号偏移量低于3.5%,响应时间约80 ms。PVA/rGO-2.0%复合薄膜展现出优异的应变传感性能与循环稳定性,在柔性可穿戴传感器领域具有潜在的应用价值。
Polyvinyl alcohol (PVA) was used as the matrix and reduced graphene oxide (rGO) was employed as the conductive filler to prepare PVA/rGO nanocomposite films via a solution blending-casting method. The structure and thermal properties of the composite films were characterized, and the effects of rGO content on the mechanical properties, electrical conductivity, and resistive strain-sensing performance of the composites were systematically investigated. The results showed that rGO could form a uniform conductive network within the PVA matrix. At an rGO mass fraction of 2.0%, the composite films exhibited an electrical percolation threshold of approximately 0.75%, a tensile strength of 65.2 MPa, and strain gauge factors of 5.5 in the strain range of 0~10% and 18.0 in the range of 10%~50%. After a test of 500 stretching cycles, the signal drift was below 3.5%, and the response time was approximately 80 ms. The PVA/rGO-2.0% composite films demonstrated excellent strain-sensing performance and cyclic stability, indicating potential application in flexible wearable sensors.
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2025年度河南省科技攻关项目(252102210112)
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