Decoration of Co nanoparticles on ZnO-branched SnO2 nanowires to enhance gas sensing
- Authors
- Kim, Hyoun Woo; Na, Han Gil; Kwon, Yong Jung; Cho, Hong Yeon; Lee, Chongmu
- Issue Date
- Nov-2015
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- ZnO; Co nanoparticles; Chemical sensors
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.219, pp.22 - 29
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 219
- Start Page
- 22
- End Page
- 29
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155953
- DOI
- 10.1016/j.snb.2015.05.017
- ISSN
- 0925-4005
- 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.
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