Dual sensitization of MWCNTs by co-decoration with p- and n-type metal oxide nanoparticles
- Authors
- Choi, Myung Sik; Bang, Jae Hoon; Mirzaei, Ali; Na, Han Gil; Kwon, Yong Jung; Kang, Sung Yong; Choi, Sun-Woo; Kim, Sang Sub; Kim, Hyoun Woo
- Issue Date
- Jul-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Carbon nanotubes; ZnO; CuO; Gas sensor; Dual sensitization; Selectivity
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.264, pp.150 - 163
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 264
- Start Page
- 150
- End Page
- 163
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16831
- DOI
- 10.1016/j.snb.2018.02.179
- ISSN
- 0925-4005
- Abstract
- We present a dual sensitization gas sensor for selective detection of either H2S or C2H5OH gases, based on ZnO/CuO nanoparticle (NP)-decorated MWCNTs. First, Cu-Zn layers of three different thickness (3, 6, 9 nm) were successfully deposited on the surfaces of CNTs by a sputtering process and subsequently converted to their corresponding oxides by thermal annealing. The gas sensing characteristics of metal oxide decorated-MWCNTs were studied in the presence of three gases, namely NO2, H2S, and C2H5OH. The best sensing properties were obtained when the Cu-Zn deposition layer was 6 nm thick. The optimized sensor showed extraordinary responses to both H2S and C2H5OH gases at working temperatures of 100 degrees C and 200 degrees C, respectively. Therefore, selectivity was tuned by selection of the working temperature. The sensing mechanisms of the metal oxide-decorated CNTs sensors are discussed in detail. The approach described, namely co-decoration of the surfaces of MWCNTs with different metal oxides, will be of great utility to researchers who wish to fabricate dual sensitive gas sensors.
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