Kotchasak Nataporn, Inyawilert Kanittha, Wisitsoraat Anurat, Tuantranont Adisorn, Phanichphant Sukon, Channei Duangdao, Yordsri Visittapong, Liewhiran Chaikarn
Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Center of Advanced Materials for Printed Electronics and Sensors, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand and National Security and Dual-Use Technology Center, National Science and Technology Development Agency (NSTDA), Klong Luang, Phathum Thani 12120, Thailand.
Phys Chem Chem Phys. 2020 Sep 23;22(36):20482-20498. doi: 10.1039/d0cp01444c.
Sb2O3-loaded NaWO4-doped WO3 nanorods were fabricated with varying Sb contents from 0 to 2 wt% by precipitation/impregnation methods and their p-type acetylene (C2H2) gas-sensing mechanisms were rigorously analyzed. Material characterization by X-ray diffraction, X-ray photoelectron spectroscopy, scanning transmission electron microscopy and nitrogen adsorption indicated the construction of short NaWO4-doped monoclinic WO3 nanorods loaded with very fine Sb2O3 nanoparticles. The sensors were fabricated by powder pasting and spin coating and their gas-sensing characteristics were evaluated towards 0.08-1.77 vol% C2H2 at 200-350 °C in dry air. The gas-sensing properties of the NaWO4-doped WO3 sensor with the optimum Sb content of 1 wt% showed the highest p-type response of ∼250.2 to 1.77 vol% C2H2, which was more than 20 times as high as that of the unloaded one at the best working temperature of 250 °C. Furthermore, the Sb2O3-loaded sensor offered high C2H2 selectivity against CH4, H2, C3H6O, C2H5OH, HCHO, CH3OH, C8H10, C7H8, C2H4 and NO2. Mechanisms responsible for the observed p-type sensing and response enhancement behaviors were proposed based on the NaWO4-doped WO3-Sb2O3 (p-n) heterointerfaces and catalytic spillover effects. Consequently, the Sb2O3-loaded NaWO4-doped WO3 nanorods have potential as alternative p-type gas sensors for selective and sensitive C2H2 detection in various industrial applications.
通过沉淀/浸渍法制备了Sb含量在0至2 wt%之间变化的负载Sb2O3的NaWO4掺杂WO3纳米棒，并对其p型乙炔（C2H2）气敏机制进行了严格分析。通过X射线衍射、X射线光光光电子能谱、扫描透射电子显微镜和氮吸附对材料进行表征，结果表明构建了负载非常细的Sb2O3纳米颗粒的短NaWO4掺杂单斜WO3纳米棒。通过粉末粘贴和旋涂制备传感器，并在200-350℃的干燥空气中对0.08-1.77 vol%的C2H2评估其气敏特性。Sb含量为1 wt%的最佳NaWO4掺杂WO3传感器的气敏性能在250℃的最佳工作温度下对1.77 vol%的C2H2表现出约250.2的最高p型响应，这比未负载的传感器高出20倍以上。此外，负载Sb2O3的传感器对CH4、H2、C3H6O、C2H5OH、HCHO、CH3OH、C8H10、C7H8、C2H4和NO2具有高C2H2选择性。基于NaWO4掺杂WO3-Sb2O3（p-n）异质界面和催化溢流效应，提出了导致观察到的p型传感和响应增强行为的机制。因此，负载Sb2O3的NaWO4掺杂WO3纳米棒有潜力作为替代p型气体传感器，用于各种工业应用中选择性和灵敏地检测C2H2。
