Abstract Hierarchical nanostructured Co-doped WO3 with carbon as template has been successfully synthesised through facile sol-gel method. The synthesised Co-doped WO3 was characterized by X-ray diffraction, Scanning electron microscopy, Transmission electron microscopy, Energy dispersive X-ray spectrometry, and Brunauer-Emmett-Teller and X-ray photoelectron spectroscopy. The gas sensing properties of WO3 doped with Co from 0 to 0.8 wt % were also investigated on various VOCs. The fabricated sensor based on 0.6 wt% Co-doped WO3 with carbon as a template showed good sensitivity, selectivity, fast response and recovery time towards 1.5 ppm of acetone at 50 °C under 90% relative humidity. The excellent gas sensing properties could be attributed to high surface area, small crystallite size, defect of WO3 and Co catalysis effect which promotes gas adsorption and most importantly the stabilized monoclinic phase of WO3, which accounts for the good selectivity.

中文翻译：

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分级纳米结构的 Co 掺杂 WO3/碳及其改进的丙酮传感性能

摘要 通过简便的溶胶-凝胶法成功合成了以碳为模板的多级纳米结构共掺杂WO3。合成的 Co 掺杂 WO3 通过 X 射线衍射、扫描电子显微镜、透射电子显微镜、能量色散 X 射线光谱法、Brunauer-Emmett-Teller 和 X 射线光电子能谱进行表征。还研究了在各种 VOC 上掺杂 0 至 0.8 wt% Co 的 WO3 的气敏特性。基于以碳为模板的 0.6 wt% Co 掺杂 WO3 制造的传感器在 50 °C 和 90% 相对湿度下对 1.5 ppm 丙酮表现出良好的灵敏度、选择性、快速响应和恢复时间。优异的气敏特性可归因于高表面积、小晶粒尺寸、