Facile synthesis and gas sensing properties of La₂O₃-WO₃ nanofibers

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• 作者：Changhao Feng^aAuthor Vitae ; Chong Wang^aAuthor Vitae ; Pengfei Cheng^bAuthor Vitae ; Xin Li^aAuthor Vitae ; Biao Wang^cAuthor Vitae ; Yehui Guan^aAuthor Vitae ; Jian Ma^aAuthor Vitae ; Hong Zhang^aAuthor Vitae ; Yanfeng Sun^a ; ^{syf@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Peng Sun^aAuthor Vitae ; Jie Zheng^aAuthor Vitae ; Geyu Lu^a ; ^{lugy@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：La2O3-doped WO3 nanofibers ; Electrospinning ; Hot pressing ; Gas sensor
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2015
• 出版时间：31 December 2015
• 年：2015
• 卷：221
• 期：Complete
• 页码：434-442
• 全文大小：2520 K

文摘

A series of La₂O₃-doped WO₃ nanofibers were synthesized by an electrospinning method in this work. The structure composition and morphology of nanofibers were characterized by XRD (X-ray diffraction), field emission scanning electron microscopy (FESEM), selected area electron diffractive (SAED), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Sensors based on these nanofibers were fabricated by hot-press on the ceramic plates. The gas sensing properties of the undoped and La₂O₃-doped WO₃ (La³⁺:W⁶⁺ =1 mol%, 3 mol% and 5 mol%) nanofibers were tested to various gases. The sensors based on La₂O₃-doped WO₃ nanofibers, in which the molar ratio of La³⁺:W⁶⁺ is 3:100, exhibit highest response toward 100 ppm acetone, having a response about 12.7, which is almost 2 times higher than that of sensor based on pure WO₃ nanofibers. These results indicate that the acetone sensors based on the La₂O₃-doped WO₃ nanofibers exhibit fast response and good repeatability characteristics, which are promising for acetone sensors which used by air-quality and environmental monitoring.