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Enhancement of gas sensing properties by the functionalization of ZnO-branched SnO2 nanowires with Cr2O3 nanoparticles

Title
Enhancement of gas sensing properties by the functionalization of ZnO-branched SnO2 nanowires with Cr2O3 nanoparticles
Author
김현우
Keywords
Branched nanowire; SnO2 nanowire; Cr2O3 nanoparticle; Gas sensor; ZnO branch
Issue Date
2017-04
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 249, page. 656-666
Abstract
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.
URI
https://www.sciencedirect.com/science/article/pii/S0925400517306548?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/113704
ISSN
0925-4005
DOI
10.1016/j.snb.2017.04.053
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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