Highly selective NH3 gas sensor based on Co(OH)2/Ti3C2T x nanocomposites operating at room temperature

Bo Huang; Zhihua Zhao; Pu Chen; Baocang Zhou; Zhuo Chen; Yu Fu; Hongyu Zhu; Chen Chen; Shuaiwen Zhang; Anbiao Wang; Pu Shi; Xiaoqing Shen

doi:10.1039/d2ra06367k

Highly selective NH₃ gas sensor based on Co(OH)₂/Ti₃C₂T _x nanocomposites operating at room temperature

RSC Adv. 2022 Nov 18;12(51):33056-33063. doi: 10.1039/d2ra06367k. eCollection 2022 Nov 15.

Authors

Bo Huang¹, Zhihua Zhao², Pu Chen¹, Baocang Zhou², Zhuo Chen², Yu Fu², Hongyu Zhu², Chen Chen², Shuaiwen Zhang², Anbiao Wang², Pu Shi², Xiaoqing Shen¹

Affiliations

¹ College of Materials Science and Engineering, Zhengzhou University Zhengzhou 450052 China.
² College of Mechanical and Electrical Engineering, Henan University of Technology Zhengzhou 450052 China zhaozhihua@haut.edu.cn.

Abstract

Ammonia (NH₃) is a common air pollutant and is a biomarker for kidney disease. Therefore, the preparation of ammonia gas sensors with high sensitivity, good selectivity and low operating temperature is of great importance for health protection. Using the in situ electrostatic self-assembly approach, a chemoresistive gas sensor based on Co(OH)₂/Ti₃C₂T _x hybrid material was created in this study. The prepared samples were characterized by XRD, XPS, TEM, BET and other testing methods for structure, surface topography and elements. These samples were fabricated into sensors, and the gas sensing properties of the materials were investigated under different test conditions. The results show that the gas response value of the C/M-2 sensor is up to about 14.7%/100 ppm, which is three times the response value of the sensor made of pure MXene to NH₃. In addition, the Co(OH)₂/Ti₃C₂T _x hybrid sensors exhibit excellent repeatability, high sensitivity under low concentration (less than 5 ppm), fast response/recovery time (29 s/49 s) and long-time stability, which indicates their promising utility in the IoT field.