Surface Engineering of a 3D Topological Network for Ultrasensitive Piezoresistive Pressure Sensors

• DOI: 10.1021/acsami.0c11658
• Publication Date: 2020-07-31T07:48:24Z
• Authors: Hong Pan; Guangzhong Xie; Wenqian Pang; Si Wang; Yang Wang; Zhi Jiang; Xiaosong Du; Huiling Tai
• Keywords: Polypyrrole; Polyvinylidene fluoride; Piezoresistive effect; Surface Modification; Coaxial; Biocompatibility

Polypyrrole (PPy) is a good candidate material for piezoresistive pressure sensors owing to its excellent electrical conductivity and biocompatibility. However, it remains challenging fabricate PPy-based flexible with high sensitivity because of the intrinsic rigidity brittleness film composed dense PPy particles. Here, rational structure, that is, 3D-conductive elastic topological coaxial nanofiber networks, reported dramatically improve sensors. The prepared through surface modification electrospun polyvinylidene fluoride (PVDF) nanofibers by polydopamine (PDA), in order homogeneously deposit particles on networks strong interfacial adhesion (PVDF/PDA/PPy, PPP). This unique structure has area abundant contact sites, leading superb against subtle pressure. as-developed sensor delivers low limit detection (0.9 Pa), (139.9 kPa-1), fast response (22 ms), cycling stability (over 10,000 cycles), reliability, thereby showing promising value applications fields health monitoring artificial intelligence.