Superior triethylamine detection at room temperature by {-112} faceted WO3 gas sensor

Yanghai Gui; Kuan Tian; Junxian Liu; Lele Yang; Hongzhong Zhang; Yun Wang

doi:10.1016/j.jhazmat.2019.120876

Superior triethylamine detection at room temperature by {-112} faceted WO₃ gas sensor

J Hazard Mater. 2019 Dec 15:380:120876. doi: 10.1016/j.jhazmat.2019.120876. Epub 2019 Jul 12.

Authors

Yanghai Gui¹, Kuan Tian², Junxian Liu³, Lele Yang², Hongzhong Zhang⁴, Yun Wang⁵

Affiliations

¹ Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China; Henan Collaborative Innovation Centre of Environmental Pollution Control and Ecological Restoration, Zhengzhou University of Light Industry, Zhengzhou 450001, China. Electronic address: yhgui@zzuli.edu.cn.
² Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
³ Centre for Clean Environment and Energy, School of Environment and Science, Gold Coast Campus, Griffith University, 4222, Australia.
⁴ Henan Collaborative Innovation Centre of Environmental Pollution Control and Ecological Restoration, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
⁵ Centre for Clean Environment and Energy, School of Environment and Science, Gold Coast Campus, Griffith University, 4222, Australia. Electronic address: yun.wang@griffith.edu.au.

PMID: 31325692
DOI: 10.1016/j.jhazmat.2019.120876

Abstract

Effective detection of triethylamine (TEA) is important for the human health and environment, while challenging. In this study, a novel hierarchical flower-like WO₃ nanomaterial was synthesized using a microwave-assisted gas-liquid interface method. The morphology and exposed facets of WO₃ nanomaterials can be manipulated through the control of the volume ratio between the water and ethylene glycol (EG) during the synthesis. Our results demonstrate that the samples prepared with water/EG ratio of 8:32 are mainly exposed {-112} facets, which have the best gas sensing response of 180.7 to 100 ppm TEA at room temperature (RT). Its superior gas sensing performance and stability are also evidenced by the short recovery speed of 72 s to 100 ppm TEA at RT. More importantly, our experiments revealed an excellent selectivity in terms to other volatile organic compounds and further confirmed by the first-principles theoretical results. The outcomes of this study suggest that the surface engineering technique is a promising approach to improve the gas sensing performance of metal oxides gas sensor and show great potential for TEA practical detection and monitoring.

Keywords: Facet engineering; Gas sensor; Microwave-assisted gas-liquid interface method; Triethylamine; WO(3).

Publication types

Research Support, Non-U.S. Gov't