College of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.
ACS Sens. 2024 Jul 26;9(7):3604-3615. doi: 10.1021/acssensors.4c00600. Epub 2024 Jul 17.
Metal oxides with nanoarray structures have been demonstrated to be prospective materials for the design of gas sensors with high sensitivity. In this work, the WO nanoneedle array structures were synthesized by a one-step hydrothermal method and subsequent calcination. It was demonstrated that the calcination of the sample at 400 °C facilitated the construction of lilac-like multiple self-supporting WO arrays, with appropriate c/h-WO heterophase junction and highly oriented nanoneedles. Sensors with this structure exhibited the highest sensitivity (2305) to 100 ppm ethylene glycol at 160 °C and outstanding selectivity. The enhanced ethylene glycol gas sensing can be attributed to the abundant transport channels and active sites provided by this unique structure. In addition, the more oxygen adsorption caused by the heterophase junction and the aggregation of reaction medium induced by tip effect are both in favor of the improvement on the gas sensing performance.
具有纳米阵列结构的金属氧化物已被证明是设计高灵敏度气体传感器的有前途的材料。在这项工作中，WO 纳米针阵列结构通过一步水热法和随后的煅烧合成。结果表明，在 400°C 下煅烧样品有利于构建具有合适 c/h-WO 异质结和高度取向纳米针的淡紫色多自支撑 WO 阵列。具有这种结构的传感器在 160°C 下对 100ppm 乙二醇表现出最高的灵敏度（2305）和出色的选择性。这种增强的乙二醇气体传感性能可归因于这种独特结构提供的丰富传输通道和活性位点。此外，异质结引起的更多氧吸附和尖端效应引起的反应介质聚集都有利于提高气体传感性能。
