School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, PR China.
School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, PR China.
J Hazard Mater. 2021 Jun 15;412:125175. doi: 10.1016/j.jhazmat.2021.125175. Epub 2021 Jan 23.
The preparation of fast, highly responsive and reliable gas sensing devices for the detection of acetone gas is considered to be a key challenge for the development of accurate disease diagnosis systems through exhaled respiratory gases. In the paper, yolk shell SbO/WO is synthesized and its gas sensing performance was studied by static test system. Special, the maximum response value of 1:1 SbO/WO yolk-shell (WO-1 YSL) sensor to 100 ppm acetone can reach as high as 50.0 at 200 ℃. And it also exhibits excellent response/recover time (4 s/5 s), low detection limit (2 ppm) and superior selectivity towards acetone. More importantly, in mixed selective gas test, the sensor shows high selectivity towards acetone. And the mechanism is analyzed by ex-situ XPS. The excellent gas-sensing performance can be attributed to unique yolk-shell structure, which facilitates the rapid transport of charge carriers from the surface to the bulk and provides more active sites for gas adsorption and desorption; the heterojunction between of SbO and WO, which promotes oxygen pre-adsorption on the surface and increasing the interfacial potential; the increased oxygen vacancies which allowing more chemisorbed oxygen to form.
制备快速、高响应和可靠的气体传感设备以检测丙酮气体被认为是通过呼出呼吸气体开发准确疾病诊断系统的关键挑战。在本文中，通过静态测试系统合成了蛋黄壳 SbO/WO，并研究了其气体传感性能。特别是，100 ppm 丙酮下，1:1 SbO/WO 蛋黄壳（WO-1 YSL）传感器的最大响应值在 200℃时可高达 50.0。并且它还表现出优异的响应/恢复时间（4 s/5 s）、低检测限（2 ppm）和对丙酮的高选择性。更重要的是，在混合选择性气体测试中，传感器对丙酮表现出高选择性。并通过原位 XPS 对其机制进行了分析。优异的气体传感性能归因于独特的蛋黄壳结构，这有利于载流子从表面快速传输到体相，并为气体吸附和脱附提供更多的活性位点；SbO 和 WO 之间的异质结，促进了表面上的氧气预吸附并增加了界面势；增加的氧空位允许更多的化学吸附氧形成。
