Mesoporous WO3 modified by Au nanoparticles for enhanced trimethylamine gas sensing properties

Yunan Wang; Shendan Zhang; Chaozhu Huang; Fengdong Qu; Dong Yao; Haichuan Guo; Haohao Xu; Chunjie Jiang; Minghui Yang

doi:10.1039/d0dt03131c

Mesoporous WO₃ modified by Au nanoparticles for enhanced trimethylamine gas sensing properties

Dalton Trans. 2021 Jan 21;50(3):970-978. doi: 10.1039/d0dt03131c. Epub 2020 Dec 22.

Authors

Yunan Wang¹, Shendan Zhang, Chaozhu Huang, Fengdong Qu, Dong Yao, Haichuan Guo, Haohao Xu, Chunjie Jiang, Minghui Yang

Affiliation

¹ School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, PR China. jiangcj@lnnu.edu.cn.

PMID: 33350996
DOI: 10.1039/d0dt03131c

Abstract

In this paper, KIT-6 is used as a template to prepare ordered mesoporous materials WO₃ and Au-loaded WO₃ (Au-WO₃). The pristine WO₃ sensor and the Au-WO₃ sensor are fabricated for the detection of 19 important gases, such as trimethylamine, formaldehyde and CS₂. The results show that the Au-WO₃ sensor has better selectivity and higher response to TMA. At a working temperature of 268 °C, the response (R_a/R_g) of the Au-WO₃ sensor to 100 ppm of TMA is 41.56 and the response time is 1 s. In addition, the sensor has excellent response/recovery capabilities and stability. These high sensing performances are mainly attributed to the electronic and chemical sensitization of the noble metal Au and the presence of a high specific surface area supported by the mesoporous structure. Therefore, Au-doped mesoporous WO₃ should be a promising material for a high performance TMA gas sensor.