Promotional effects of ZnO-branching and Au-functionalization on the surface of SnO2 nanowires for NO2 sensing
- Authors
- Choi, Myung Sik; Bang, Jae Hoon; Mirzaei, Ali; Oum, Wansik; Na, Han Gil; Jin, Changhyun; Kim, Sang Sub; Kim, Hyoun Woo
- Issue Date
- May-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Branched nanowire; Gas sensor; SnO2-ZnO; NO2; Au
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.786, pp.27 - 39
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 786
- Start Page
- 27
- End Page
- 39
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/14177
- DOI
- 10.1016/j.jallcom.2019.01.311
- ISSN
- 0925-8388
- Abstract
- Branched nanowires (b-NWs) have been used for advanced applications because of their nanoscale dimensions, high surface area, and scalable synthetic methods. Herein, for the first time, we report the fabrication of Au-functionalized ZnO-branched SnO2 NWs for enhanced gas sensing application. As-fabricated NWs were structurally and morphologically investigated by X-ray diffraction, scanning electron microscopy as well as transmission electron microscopy to reveals the crystallinity and morphology of NWs. By comparing the gas sensing properties of Au-functionalized b-NWs, b-NWs, and pristine SnO2 NWs gas sensors, in terms of their sensitivity and cross-sensitivity towards NO2, we demonstrate the superior sensing properties of Au-functionalized b-NWs sensors. In particular the Au-functionalized b-NWs sensor showed a response (R-g/R-a) of 13.07 to 10 ppm NO2 gas which was higher than those of b-NWs, and pristine SnO2 NWs gas sensors. In addition to the special architecture of sensors (i.e. ZnO b-NWs on SnO(2 )NWs), which produces a large number of hetero- and homojunctions (a branching effect), Au acts as a catalyst to further improve the sensing characteristics of this particular sensor (a functionalization effect). According to the obtained results, we believe that metal oxide gas sensors based on noble metal-functionalized b-NWs, which use a facile synthesis procedure and produce enhanced sensing performance, will play a vital role in the future of the sensor industry.
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