Porous Eu₂O₃–In₂O₃ nanotube-based ethanol gas sensor with high sensitivity and excellent selectivity

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• 作者：Hongwei Lian ; Yi Feng ; Zhijun Wang ; Li Liu ; Xuexin Guo ; Xuesong Wang
• 刊名：Applied Physics A
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：123
• 期：3
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Condensed Matter Physics; Optical and Electronic Materials; Nanotechnology; Characterization and Evaluation of Materials; Surfaces and Interfaces, Thin Films; Operating Procedures, Materials Treatment
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0630
• 卷排序：123

文摘

In this work, we employed electrospinning and calcination method to fabricate porous Eu₂O₃–In₂O₃ nanotubes and observed the morphology and characteristic of products through X-ray diffraction (XRD), energy-dispersive X-ray spectra (EDX), and scanning electron microscopy (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). The SEM and TEM images exhibit that the surface of nanotubes is distributed with numerous pores. Gas-sensing investigations revealed that the 3 wt% porous Eu₂O₃–In₂O₃ nanotube sensors possess high sensitivity and excellent selectivity to ethanol. Its response to 50 ppm ethanol was up to 44 at optimum temperature of 260 °C, which is 6.2 times larger than the pure nanotube. The response to ethanol is four times larger than that of acetone. The response and recovery time to 50 ppm ethanol was 3 and 21 s, respectively. Besides, the sensor could detect 0.2 ppm ethanol with response of 1.8. Those indicate that the sensing properties of In₂O₃ nanotube sensor are improved by doping Eu. In brief, the porous Eu₂O₃–In₂O₃ nanotube sensor has hopes for practice.