Journal ArticleDOI
Gas-sensing properties and sensitivity promoting mechanism of Cu-added SnO2 thin films deposited by ultrasonic spray pyrolysis ☆
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TLDR
In this article, two mechanisms were found to be responsible for determining the sensitivity of Cu-doped SnO2 thin films for gas sensors, and the contribution of each mechanism to the thin film sensors with various Cu/Sn ratios was discussed.Abstract:
Tin oxide-based thin films for gas sensors were deposited by the ultrasonic spray pyrolysis technology. The thin films were porous and comprised nano-sized crystallites with fast responses to the H2S gas. The sensor performance was observed to be enhanced by the Cu additive, which was incorporated at the Cu/Sn ratio of 0–1. The influences of Cu-doping amount on the gas-sensing properties were discussed. The values of power law exponent n for each thin film sensor were calculated to discuss the sensitivity of the sensors, which was promoted by the Cu additive. Two mechanisms were found to be responsible for determining the sensitivity of Cu-doped SnO2 thin films. One is the known receptor function of the SnO2 grain, and the other is the promoting mechanism caused by the transformation between CuO and CuS in the H2S detection. The former one produces a temperature-dependent sensitivity, which is ascribed to the various types of adsorbed oxygen on grain surface at different operating temperatures. The latter one results in a promoted sensitivity according to the present evaluation. The contribution of each mechanism to the thin film sensors with various Cu/Sn ratios was discussed.read more
Citations
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Pt Nanoparticles Sensitized Ordered Mesoporous WO 3 Semiconductor: Gas Sensing Performance and Mechanism Study
Junhao Ma,Yuan Ren,Xinran Zhou,Liangliang Liu,Yongheng Zhu,Xiaowei Cheng,Pengcheng Xu,Xinxin Li,Yonghui Deng,Yonghui Deng,Dongyuan Zhao +10 more
TL;DR: In this paper, a straightforward coassembly strategy is demonstrated to synthesize Pt sensitized mesoporous WO3 with crystalline framework through the simultaneous coassembly of amphiphilic poly(ethylene oxide)-b-polystyrene, hydrophobic platinum precursors, and hydrophilic tungsten precursor.
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Rationally designed mesoporous In2O3 nanofibers functionalized Pt catalysts for high-performance acetone gas sensors
TL;DR: In this paper, a facile design and simple fabrication of acetone gas sensors based on one-dimensional (1D) porous platinum-doped In2O3 nanofiber structure was demonstrated.
Journal ArticleDOI
Highly efficient photocatalytic degradation of oil pollutants by oxygen deficient SnO2 quantum dots for water remediation
Jianqiao Liu,Qianru Zhang,Xinyue Tian,Ye Hong,Yichen Nie,Ningning Su,Guohua Jin,Zhaoxia Zhai,Ce Fu +8 more
TL;DR: In this paper, the oxygen vacancy-rich SnO2 quantum dots (QDs) are prepared in aqueous solution via a facile bottom-up self-assembly route and applied to the photocatalytic degradation of oil pollutants in water.
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Enhanced catalytic activity of SnO2 quantum dot films employing atomic ligand-exchange strategy for fast response H2S gas sensors
Zhilong Song,Songman Xu,Jingyao Liu,Zhixiang Hu,Naibo Gao,Jianbing Zhang,Fei Yi,Guangzu Zhang,Shenglin Jiang,Huan Liu +9 more
TL;DR: In this article, an atomic ligand exchange strategy was used to construct highly sensitive and selective SnO2 quantum dot gas sensors with high response and recovery time (48's/35's) at 70°C.
Journal ArticleDOI
Inhomogeneous Oxygen Vacancy Distribution in Semiconductor Gas Sensors: Formation, Migration and Determination on Gas Sensing Characteristics.
TL;DR: The gradient-distributed oxygen vacancy model had the applications in simulating the sensor performances, such as the power law, the grain size effect and the effect of depletion layer width, according to the defect kinetics of diffusion and exclusion.
References
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