High-temperature piezoelectric sensors are very important in severe environments such as fire safety, aerospace and oil drills, however, most current sensors are not heat resistant (<300 °C) and are fragile, which limits their use, especially in high-temperature environments. A high-temperature resistant flexible piezoelectric film based on graphene oxide (GO)/polyacrylonitrile (PAN) composites was prepared by electrospinning and thermal treatment. It was packed into a micro-device, which could work continuously at 500 °C. The introduction of GO significantly increased the mechanical properties of the PAN nanofibers because the oxygen-containing functional groups (electronegative groups) on the surface of the GO initiated a nucleophilic attack on the PAN molecule during heat treatment, enabling the GO to initiate the cyclization of the PAN at lower heat-treatment temperatures. In addition, the abundant oxygen-containing functional groups on GO acted as pro-oxidants to hasten the oxidation of PAN during heat treatment. The effects of GO content and heat treatment temperature on the properties of the nanofiber films were investigated. A GO/PAN nanofiber piezoelectric sensor heat-treated at 300 °C had a 9.10 V and 2.25 μA peak output, which are respectively 101.3% and 78.6% higher than those of the untreated films. Cyclic testing over 5000 cycles at 350 °C confirmed the stable output performance of the GO/PAN nanofiber piezoelectric sensor. Furthermore, a sensor heat-treated at 400 °C had a sensitivity of 1.7 V/N, which is 83.5% higher than that of an untreated one. The results show that the prepared GO/PAN nanofiber piezoelectric sensor combines high temperature resistance, high flexibility, stability and high sensitivity, and may have broad applications in high temperature environments such as the aerospace and petroleum industries.
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