Xylene gas sensor based on Au-loaded WO₃·H₂O nanocubes with enhanced sensing performance

详细信息    查看全文

• 作者：Feng Li^aAuthor Vitae ; Sijia Guo^aAuthor Vitae ; Jingli Shen^aAuthor Vitae ; Liang Shen^aAuthor Vitae ; Dongming Sun^aAuthor Vitae ; Bin Wang^bAuthor Vitae ; Yu Chen^a ; ^{chenwy@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Shengping Ruan^a ; ^b ; ^{ruansp@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：WO3· ; H2O nanocubes ; Au-loaded ; Xylene ; Gas sensor
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：238
• 期：Complete
• 页码：364-373
• 全文大小：3891 K

文摘

In this work, Au was employed as an ideal dopant to obtain enhanced sensing performance of xylene gas sensor. Firstly, the as-perpared Au-doped WO₃·H₂O powder was synthesized by a facile and efficient hydrothermal method. Then various techniques including X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray Spectrometer (EDX) were employed to investigate the morphology, microstructure, crystalline nature and chemical compositions of the as-prepared Au-doped WO₃·H₂O nanomaterials. The morphologies of the nanomaterials could be easily controlled by changing the atomic percentage (at%) of Au (0.15 at%, 0.30 at%, 0.45 at%) in the precursor solutions. And it have been attested that the 0.30 at% Au-doped WO₃·H₂O-based sensor realized higher gas response of 26.4–5 ppm xylene at 255 °C, faster response/recovery speed and stronger selectivity to target gas compared with the unloaded one. Furthermore, the detection limit could be as low as 200 ppb level. Hence, Au-loaded WO₃·H₂O nanomaterial could be a promising material applied in xylene gas sensor.

Also, the mechanism involved in the improving xylene sensing properties of Au/WO₃·H₂O was discussed.