Cr2O3 nanoparticle-functionalized WO3 nanorods for ethanol gas sensors
Cr2O3 nanoparticle-functionalized WO3 nanorods for ethanol gas sensors
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DOI：
10.1016/j.apsusc.2017.01.245
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发表时间：
2018-02-28
影响因子：
6.7
通讯作者：
Lee, Chongmu
中科院分区：
文献类型：
--
作者：
Choi, Seungbok;Bonyani, Maryam;Lee, Chongmu
通过在氧化气氛中热蒸发WO 3粉末，然后用Cr2 O3纳米颗粒旋涂纳米线并在氧化气氛中热退火，合成了原始WO 3纳米棒和Cr2 O3功能化的WO 3纳米棒。扫描电子显微镜用于检查的形态特征和X-射线衍射用于研究的结晶度和相形成的合成纳米棒。在不同的温度下，在测试气体（乙醇，丙酮，CO，苯和甲苯）的存在下进行气敏测试。Cr2 O3功能化的WO 3纳米棒传感器显示出更强的响应，这些气体相对于原始的WO 3纳米棒传感器。特别地，Cr2 O3官能化的WO 3纳米棒传感器对200 ppm乙醇气体的响应为5.58，这是原始WO 3纳米棒传感器的大约4.4倍。此外，Cr2 O3功能化的WO 3纳米棒传感器具有较短的响应和恢复时间。原始的WO 3纳米棒对乙醇气体没有选择性，而Cr2 O3功能化的WO 3纳米棒传感器对乙醇显示出良好的选择性。详细讨论了Cr2 O3功能化WO 3纳米棒对乙醇的气敏机理。(C)2017爱思唯尔B. V.保留所有权利。
Pristine WO3 nanorods and Cr2O3-functionalized WO3 nanorods were synthesized by the thermal evaporation of WO3 powder in an oxidizing atmosphere, followed by spin-coating of the nanowires with Cr2O3 nanoparticles and thermal annealing in an oxidizing atmosphere. Scanning electron microscopy was used to examine the morphological features and X-ray diffraction was used to study the crystallinity and phase formation of the synthesized nanorods. Gas sensing tests were performed at different temperatures in the presence of test gases (ethanol, acetone, CO, benzene and toluene). The Cr2O3-functionalized WO3 nanorods sensor showed a stronger response to these gases relative to the pristine WO3 nanorod sensor. In particular, the response of the Cr2O3-functionalized WO3 nanorods sensor to 200 ppm ethanol gas was 5.58, which is approximately 4.4 times higher that of the pristine WO3 nanorods sensor. Furthermore, the Cr2O3-functionalized WO3 nanorods sensor had a shorter response and recovery time. The pristine WO3 nanorods had no selectivity toward ethanol gas, whereas the Cr2O3-functionalized WO3 nanorods sensor showed good selectivity toward ethanol. The gas sensing mechanism of the Cr2O3-functionalized WO3 nanorods sensor toward ethanol is discussed in detail. (C) 2017 Elsevier B.V. All rights reserved.