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Room-temperature H2S gas sensing by selectively synthesized Cux(x=1,2)O:SnO2 thin film nanocomposites with oblique & vertically assembled SnO2 ceramic nanorods

Title
Room-temperature H2S gas sensing by selectively synthesized Cux(x=1,2)O:SnO2 thin film nanocomposites with oblique & vertically assembled SnO2 ceramic nanorods
Author
좌용호
Keywords
Cux(X-1,2)O:SnO(2)thin film; Spray process; p -n heterojunctions; H2S gas sensor
Issue Date
2018-11
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v. 273, Page. 1054-1061
Abstract
A facile spray method was adopted to fabricate hierarchical Cux(x=1,2)O:SnO2 thin film nanocomposites with an oblique and vertical assembly of SnO2 ceramic nanorods for hazardous H2S gas sensing at room temperature (24.0 +/- 1 degrees C). The CuO- and Cu2O-doped SnO2 films were selectively synthesized by a one-step heat treatment process from an identical precursor on the surface of a spray-deposited SnO2 film. The coordination of CuxO doping layers with thicknesses less than 5 nm scattered on the extended SnO2 nanorods (30-80 nm thick) created numerous domains of p-n heterojunctions on the resulting CuO:SnO2 film surfaces, which led to enhanced adsorption sites when exposed to sub-ppm concentrations of H2S gas. The Cu2O-doped SnO2 thin films exhibited a fast response (21 s) and recovery speed (204 s) to 5 ppm H2S and 10% response upon exposure to 500 ppb H2S. Besides, the nanohybrid sensor showed excellent selectivity towards other gases such as CO2 and H2 including toxic NO2 and, NH3 gases at room temperature (24.0 +/- 1 degrees C). The mechanism for the enhancement of the H2S gas sensing was elucidated with respect to the unique hierarchical surface morphology and generation of active sites.
URI
https://www.sciencedirect.com/science/article/pii/S0925400518312036https://repository.hanyang.ac.kr/handle/20.500.11754/98784
ISSN
0925-4005
DOI
10.1016/j.snb.2018.06.098
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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