High-Performance Wearable Piezoresistive Sensor with a Wide Temperature Range via a Ti₃C₂T_x MXene/Au Dual-Layer Conductive Network and Microspike Structure

Currently, with the increasing popularity of wearable electronic devices, there is growing demand for the performance and application scenarios of flexible pressure sensors. However, effectively balancing a sensor’s sensitivity and sensing range over a wide temperature range remains an urgent challenge. In this paper, a simple and economical template transfer method was used to prepare microspike structures with random distributions, while a dual-layer conductive network was constructed using Ti 3 C 2 T x MXene (two-dimensional transition metal carbides and nitrides) and gold nanoparticles (Au). The working mechanism of the piezoresistive sensor was systematically analyzed. The special surface microstructure and the synergistic effect between the double-layer conductive network enabled the sensor to acquire high sensitivity (497.08 kPa –1 ) over a wide sensing range (>1000 kPa) and maintain stability for working even at high temperatures (>400 °C). In addition, the obtained piezoresistive sensor had a short response time and relaxation time, good linearity, a low detection limit, and good fatigue resistance. Furthermore, we demonstrated the application of this sensor in table tennis and electronic sports (eSports) scenarios, showing its bright prospect in human motion pattern recognition. Its insensitivity to temperature also showed great potential for the development of wearable electronic products that can work stably in harsh environments.