Enhanced ammonia sensing response based on Pt-decorated Ti3C2T x/TiO2composite at room temperature

Haifeng Zhang; Li Wang; Yecheng Zou; Yongzhe Li; Jingyue Xuan; Xiaomei Wang; Fuchao Jia; Guangchao Yin; Meiling Sun

doi:10.1088/1361-6528/acbbd2

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x/TiO₂composite at room temperature

Nanotechnology. 2023 Mar 1;34(20). doi: 10.1088/1361-6528/acbbd2.

Authors

Haifeng Zhang¹, Li Wang², Yecheng Zou², Yongzhe Li², Jingyue Xuan¹, Xiaomei Wang¹, Fuchao Jia¹, Guangchao Yin¹, Meiling Sun¹

Affiliations

¹ School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, 255000, People's Republic of China.
² Shandong Dongyue Future Hydrogen Energy Material Co., Ltd, Zibo 256401, People's Republic of China.

PMID: 36787630
DOI: 10.1088/1361-6528/acbbd2

Abstract

Herein, we report a Pt-decorated Ti₃C₂T_x/TiO₂gas sensor for the enhanced NH₃sensing response at room temperature. Firstly, the TiO₂nanosheets (NSs) arein situgrown onto the two-dimensional (2D) Ti₃C₂T_xby hydrothermal treatment. Similar to Ti₃C₂T_xsensor, the Ti₃C₂T_x/TiO₂sensor has a positive resistance variation upon exposure to NH₃, but with slight enhancement in response. However, after the loading of Pt nanoparticles (NPs), the Pt-Ti₃C₂T_x/TiO₂sensor shows a negative response with significantly improved NH₃sensing performance. The shift in response direction indicates that the dominant sensing mechanism has changed under the sensitization effect of Pt NPs. At room temperature, the response of Pt-Ti₃C₂T_x/TiO₂gas sensor to 100 ppm NH₃is about 45.5%, which is 13.8- and 10.8- times higher than those of Ti₃C₂T_xand Ti₃C₂T_x/TiO₂gas sensors, respectively. The experimental detection limit of the Pt-Ti₃C₂T_x/TiO₂gas sensor to detect NH₃is 10 ppm, and the corresponding response is 10.0%. In addition, the Pt-Ti₃C₂T_x/TiO₂gas sensor shows the fast response/recovery speed (23/34 s to 100 ppm NH₃), high selectivity and good stability. Considering both the response value and the response direction, the corresponding gas-sensing mechanism is also deeply discussed. This work is expected to shed a new light on the development of noble metals decorated MXene-metal oxide gas sensors.

Keywords: NH3; Pt decoration; Ti3C2T x; Ti3C2T x /TiO2; room-temperature gas sensor.