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

• Published in: Nano-micro letters 2022-12, Vol.14 (1), p.56-14, Article 56
• Main Authors: Yang, Zijie, Lv, Siyuan, Zhang, Yueying, Wang, Jing, Jiang, Li, Jia, Xiaoteng, Wang, Chenguang, Yan, Xu, Sun, Peng, Duan, Yu, Liu, Fangmeng, Lu, Geyu
• Format: Article
• Language: English
• Subjects: 3D porous crumpled MXene sphere; All-MXene; Artificial intelligence; Degradation; Electronic devices; Electronic waste; Engineering; Environmental monitoring; Gas sensors; Gases; Hydrogen peroxide; MXenes; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Nitrogen dioxide; NO2 and pressure sensor; Pollution abatement; Pollution monitoring; Polyvinyl alcohol; Pressure sensors; Response time; Self-assembly; Sensors; Signal monitoring; Spheres; Spray pyrolysis; Substrates; Transient
• ISSN: 2311-6706; 2150-5551
• DOI: 10.1007/s40820-022-00796-7

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 H 2 O 2 (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 NO 2 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 NO 2 sensing, with a response of up to 12.11% at 5 ppm NO 2 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 NO 2 and pressure sensors can be rapidly degraded in medical H 2 O 2 within 6 h. This work provides a new avenue toward environmental monitoring, human physiological signal monitoring, and recyclable transient electronics.