Superior triethylamine detection at room temperature by {-112} faceted WO3 gas sensor
Superior triethylamine detection at room temperature by {-112} faceted WO3 gas sensor
复制标题
DOI：
10.1016/j.jhazmat.2019.120876
复制
发表时间：
2019-12-15
影响因子：
13.6
通讯作者：
Wang, Yun
中科院分区：
文献类型：
--
作者：
Gui, Yanghai;Tian, Kuan;Wang, Yun
三乙胺（TEA）的有效检测对人类健康和环境具有重要意义，同时也具有挑战性。本研究利用微波辅助气液界面法合成了一种新型的具有层次结构的花状WO 3纳米材料。通过控制合成过程中水和乙二醇的体积比，可以控制WO 3纳米材料的形貌和暴露面。结果表明，水/EG比为8：32时，样品的{-112}晶面主要暴露，室温下具有最佳的TEA气敏响应（180.7 ~ 100 ppm）。其优越的上级气敏性能和稳定性也证明了72秒的恢复速度，以100 ppm TEA在RT。更重要的是，我们的实验显示了一个优秀的选择性方面的其他挥发性有机化合物，并进一步证实了第一性原理的理论结果。研究结果表明，表面工程技术是提高金属氧化物气体传感器气敏性能的一种有前途的方法，在TEA实际检测和监测中显示出巨大的潜力。
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.