期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 216, 期 -, 页码 358-366出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.04.035
关键词
Ni-doped ZnO; Branched nanowire; Gas sensor; Xylene; Selectivity
资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2013R1A2A1A01006545]
- ARCNEX from NRF of Korea - MEST [2011-0031933]
Branched ZnO nanowires (NWs) doped with Ni were grown by a three-step vapor phase method for the sensitive and selective detection of p-xylene. ZnO NWs were directly grown on sensor substrates with Au electrodes, which were transformed into NiO NWs by the thermal evaporation of NiCl2 powder at 700 degrees C. ZnO branches doped with Ni were grown from NiO NWS by the thermal evaporation of Zn metal powder at 500 degrees C. The stem NiO NWS played the role of catalyst for the growth of ZnO branches through vapor-liquid-solid mechanism. The Ni-doped branched ZnO NWs showed enhanced gas response (S= resistance ratio) to methyl benzenes, especially to 5 ppm p-xylene (S=42.44) at 400 degrees C. This value is 1.7 and 2.5 times higher than the responses to 5 ppm toluene (5=25.73) and C2H5OH (S= 16.72), respectively, and significantly higher than the cross-responses to other interfering gases such as benzene, HCHO, trimethylamine, H-2, and CO. The selective detection of xylene was attributed to the catalytic role of the Ni component. This novel method to form catalyst-doped hierarchical ZnO NWs provides a promising approach to accomplish superior gas sensing characteristics by the synergetic combination of enhanced chemiresistive variation due to the increased number of branch-to-branch Schottky barrier contacts and the catalytic function of the Ni dopant. (C) 2015 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据