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.
Department of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
J Hazard Mater. 2019 Dec 15;380:120876. doi: 10.1016/j.jhazmat.2019.120876. Epub 2019 Jul 12.
Effective detection of triethylamine (TEA) is important for the human health and environment, while challenging. In this study, a novel hierarchical flower-like WO nanomaterial was synthesized using a microwave-assisted gas-liquid interface method. The morphology and exposed facets of WO 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.
有效检测三乙胺（TEA）对人类健康和环境很重要，但具有挑战性。在这项研究中，我们使用微波辅助气-液界面法合成了一种新型的分级花状 WO 纳米材料。通过控制合成过程中水和乙二醇（EG）之间的体积比，可以操纵 WO 纳米材料的形态和暴露晶面。我们的结果表明，在水/EG 比例为 8:32 时制备的样品主要暴露{-112}晶面，在室温下对 100ppm TEA 的气体传感响应最佳，为 180.7。其优异的气体传感性能和稳定性也通过在室温下对 100ppm TEA 的快速恢复速度（72s）得到证明。更重要的是，我们的实验在其他挥发性有机化合物方面表现出了优异的选择性，并通过第一性原理理论结果得到进一步证实。这项研究的结果表明，表面工程技术是提高金属氧化物气体传感器气体传感性能的一种很有前途的方法，并且在 TEA 的实际检测和监测方面具有很大的潜力。
