Ultra-high performance humidity sensor enabled by a self-assembled CuO/Ti3C2T X MXene

Lei Wang; Xinqi Yao; Shuaishuai Yuan; Yang Gao; Ruhang Zhang; Xinhai Yu; Shan-Tung Tu; Shijian Chen

doi:10.1039/d2ra06903b

Ultra-high performance humidity sensor enabled by a self-assembled CuO/Ti₃C₂T _X MXene

RSC Adv. 2023 Feb 21;13(9):6264-6273. doi: 10.1039/d2ra06903b. eCollection 2023 Feb 14.

Authors

Lei Wang^{1

2}, Xinqi Yao^{1

2}, Shuaishuai Yuan^{1

2}, Yang Gao², Ruhang Zhang^{1

2}, Xinhai Yu^{1

2}, Shan-Tung Tu^{1

2}, Shijian Chen³

Affiliations

¹ MOE Key Laboratory of Pressure Systems and Safety, East China University of Science and Technology Shanghai 200237 P.R. China yxhh@ecust.edu.cn.
² School of Mechanical and Power Engineering, East China University of Science and Technology Shanghai 200237 P.R. China.
³ SUFA Technology Industry Co., Ltd., CNNC Suzhou 215001 P.R. Cina.

Abstract

An ultra-high performance humidity sensor based on a CuO/Ti₃C₂T _X MXene has been investigated in this work. The moisture-sensitive material was fabricated by a self-assembly method. The morphology and nanostructure of the fabricated CuO/Ti₃C₂T _X composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectra. The humidity sensing abilities of the CuO/Ti₃C₂T _X sensor in the relative humidity (RH) range from 0% to 97% were studied. The results showed that the humidity sensor had a high sensitivity of 451 kΩ/% RH, short response time (0.5 s) and recovery time (1 s), a low hysteresis value, and good repeatability. The CuO/Ti₃C₂T _X sensor exhibited remarkable properties in human respiration rate monitoring, finger non-contact sensing, and environmental detection. The moisture-sensitive mechanism of CuO/Ti₃C₂T _X was discussed. The fabricated CuO/Ti₃C₂T _X showed great potential in the application of moisture-sensitive materials for ultra-high-performance humidity sensors.