Electrochemically Decorated ZnTe Nanodots on Single-Walled Carbon Nanotubes for Room-Temperature NO2 Sensor Application
- Authors
- Kim, Donguk; Park, Ki-Moon; Shanmugam, Rajakumar; Yoo, Bongyoung
- Issue Date
- Nov-2014
- Publisher
- American Scientific Publishers
- Keywords
- Carbon Nanotube; Sensor; NO2 Gas; ZnTe Nanodots; Electrodeposition
- Citation
- Journal of Nanoscience and Nanotechnology, v.14, no.11, pp.8248 - 8252
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Nanoscience and Nanotechnology
- Volume
- 14
- Number
- 11
- Start Page
- 8248
- End Page
- 8252
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/21499
- DOI
- 10.1166/jnn.2014.9901
- ISSN
- 1533-4880
- Abstract
- A gas sensor with ZnTe nanodot-modified single-walled carbon nanotubes (SWCNTs) is demonstrated for NO2 detection at room temperature. ZnTe nanodots are electrochemically deposited in an aqueous solution containing ZnSO4, TeO2 and citrate. A deposition potential range of ZnTe formation of -0.65 to -0.9 V is determined by cyclic voltammetry, and an intermetallic ZnTe compound is formed at above 50 degrees C bath. SWCNT-based sensors show the highly sensitive response down to 1 ppm NO2 gas at room temperature. In particular, the sensitivity of ZnTe nanodot-modified SWCNTs is increased by 6 times as compared to that of pristine SWCNT sensors. A selectivity test of SWCNT-ZnTe nanodots sensors is carried out with ammonia gas (NH3) and methanol vapor (MeOH), and the result confirms an excellent selectivity to NO2 gas.
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