Enhancement of gas sensing properties by the functionalization of ZnO-branched SnO2 nanowires with Cr2O3 nanoparticles
Enhancement of gas sensing properties by the functionalization of ZnO-branched SnO2 nanowires with Cr2O3 nanoparticles
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DOI：
10.1016/j.snb.2017.04.053
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发表时间：
2017-10-01
影响因子：
8.4
通讯作者：
Kim, Hyoun Woo
中科院分区：
文献类型：
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作者：
Kwon, Yong Jung;Kang, Sung Yong;Kim, Hyoun Woo
功能化支链纳米线（NWs）等复杂金属氧化物是一类新型的纳米复合材料，具有独特的气敏性能。在本工作中，我们研究了cr2o3功能化zno支化SnO2 NWs的气敏性能，灵感来自于它们的高表面积和众多电阻点。并与原始SnO2 NWs和zno枝化SnO2 NWs进行了对比研究。为了制备功能化NWs，将ZnO枝化的SnO2 NWs溅射镀上Cr层，然后在500℃下退火，在ZnO枝上生成孤立的Cr2O3 NPs。x射线衍射、扫描电镜和晶格分辨透射电镜结果表明，cr2o3功能化zno支化SnO2 NWs成功形成。结果表明，Cr2O3的官能化大大提高了传感器对NO2气体的响应。此外，通过在各种干扰气体存在下的测试，证明了传感器具有良好的选择性。本文详细讨论了潜在的气敏机制。我们认为，本文报道的cr2o3功能化zno支化SnO2 NWs是高灵敏度和选择性检测NO2气体的有前途的传感器。(C) 2017 Elsevier B.V.版权所有
Complex metal oxides such as functionalized branched nanowires (NWs) are a new category of nanocomposites with unique properties for gas sensing applications. In the present work, we studied the gas sensing properties of Cr2O3-functionalized ZnO-branched SnO2 NWs, inspired by their high surface area and numerous resistive points. These NWs were studied and compared with pristine SnO2 NWs and ZnO-branched SnO2 NWs. To prepare the functionalized NWs, ZnO-branched SnO2 NWs were sputter coated with a Cr layer and then annealed at 500 degrees C to produce isolated Cr2O3 NPs on the ZnO branches. Results of X-ray diffraction, scanning electron microscopy, and lattice-resolved transmission electron microscopy collectively showed that Cr2O3-functionalized ZnO-branched SnO2 NWs were successfully formed. Cr2O3 functionalization was found to greatly improve the sensors' response to NO2 gas. Furthermore, the sensors' good selectivity was demonstrated by testing them in the presence of various interfering gases. The underlying gas sensing mechanisms are discussed herein in detail. We believe that the Cr2O3-functionalized ZnO-branched SnO2 NWs reported herein are promising sensors for the highly sensitive and selective detection of NO2 gas. (C) 2017 Elsevier B.V. All rights reserved.