US EPA

7311609 

Journal Article 

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

Wang, Y; Zhang, S; Huang, C; Qu, F; Yao, D; Guo, H; Xu, H; Jiang, C; Yang, M 

2021 

Yes 

Dalton Transactions (Online)
ISSN: 1477-9234 

50 

3 

970-978 

English 

33350996 

10.1039/d0dt03131c 

WOS:000612184500023 

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 (Ra/Rg) 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.