Self-Assembly 3D Porous Crumpled MXene Spheres as Efficient Gas and Pressure Sensing Material for Transient All-MXene Sensors

Abstract

Highlights

3D porous crumpled MXene spheres were synthesized by ultrasonic spray pyrolysis technology.

All-MXene transient sensors utilizing porous crumpled MXene sphere as sensing material and MXene films as electrodes were developed, which achieved excellent gas/pressure sensing performance.

Both gas and pressure sensors can achieve rapid and controllable degradation in medical-grade H₂O₂ (2%) within 6 h.

Environmentally friendly degradable sensors with both hazardous gases and pressure efficient sensing capabilities are highly desired for various promising applications, including environmental pollution monitoring/prevention, wisdom medical, wearable smart devices, and artificial intelligence. However, the transient gas and pressure sensors based on only identical sensing material that concurrently meets the above detection needs have not been reported. Here, we present transient all-MXene NO₂ and pressure sensors employing three-dimensional porous crumpled MXene spheres prepared by ultrasonic spray pyrolysis technology as the sensing layer, accompanied with water-soluble polyvinyl alcohol substrates embedded with patterned MXene electrodes. The gas sensor achieves a ppb-level of highly selective NO₂ sensing, with a response of up to 12.11% at 5 ppm NO₂ and a detection range of 50 ppb–5 ppm, while the pressure sensor has an extremely wide linear pressure detection range of 0.14–22.22 kPa and fast response time of 34 ms. In parallel, all-MXene NO₂ and pressure sensors can be rapidly degraded in medical H₂O₂ within 6 h. This work provides a new avenue toward environmental monitoring, human physiological signal monitoring, and recyclable transient electronics.