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Decoration of Co nanoparticles on ZnO-branched SnO2 nanowires to enhance gas sensing

Title
Decoration of Co nanoparticles on ZnO-branched SnO2 nanowires to enhance gas sensing
Author
김현우
Keywords
ZnO; Co nanoparticles; Chemical sensors
Issue Date
2015-05
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 219, Page. 22-29
Abstract
We sputtered zinc-oxide (ZnO)-branched tin oxide (SnO2) nanowires with a Co shell layer with subsequent annealing to produce cobalt (Co) nanoparticles on the ZnO branches. X-ray diffraction, selected area electron diffraction, and lattice-resolve TEM images showed that the nanoparticles corresponded to a hexagonal Co phase. We further studied the NO2 sensing performance of Co-decorated ZnO branched structures in the range of 2-10 ppm at 250 degrees C. Sensor characteristics were examined in terms of sensitivity (i.e., sensor response), response time, and recovery time; we further proposed the possible mechanisms of enhancement of sensing behavior by the attachment of Co nanoparticles. Co-functionalization enhanced the sensor response and significantly decreased the recovery times. The Co-decorated ZnO branched structures showed promising sensing performance toward NO2 gas at concentrations as low as 2 ppm. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0925400515005985http://hdl.handle.net/20.500.11754/24636
ISSN
0925-4005
DOI
10.1016/j.snb.2015.05.017
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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