柔性高性能聚乙烯醇/纳米银粉水凝胶传感器

In recent years, conductive hydrogels have become popular substrates for flexible sensors because of their good mechanical properties, electrical conductivity and biocompatibility. In this paper, we solved the key problem of complex preparation technology of hydrogel and prepared a conductive AgNPs/PVA hydrogel with high tensile, high sensitivity and high stability system. It was prepared by a simple and efficient method of doping silver nanoparticles (AgNPs) into the three-dimensional network of polyvinyl alcohol (PVA) hydrogels. The hydrogel has a large draw ratio of over 500% and stability can be demonstrated by the consistency of electrical signals in 1000 cycles of stretching. The embedded AgNPs enables the hydrogel to obtain good sensing performance. The excellent performance of the sensor is also reflected by the sensing resolution of 0.5% deformation and the fast response time of 758ms. We applied this AgNPs/PVA hydrogel to the common human behaviors, such as finger and wrist bending, swallowing and nodding, which can transmit signals sensitively and stably. Overall, the excellent performances of the AgNPs/PVA hydrogel make it possible to use it in flexible wearable devices as a sensor, and help monitor human behavior.