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Investigation on synthesis and excellent gas-sensing properties of hierarchical Au-loaded SnO2 nanoflowers

Published online by Cambridge University Press:  06 September 2019

Yanlei Cui
Affiliation:
The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, People’s Republic of China; and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
Ming Zhang
Affiliation:
The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, People’s Republic of China; and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
Xuewei Li
Affiliation:
The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, People’s Republic of China; and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
Bingrong Wang
Affiliation:
The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, People’s Republic of China; and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
Ruzhi Wang
Affiliation:
The Key Laboratory of Advanced Functional Materials, Ministry of Education of China, Beijing University of Technology, Beijing 100124, People’s Republic of China; and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
Corresponding
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Abstract

The hierarchical Au-loaded SnO2 nanoflowers were synthesized using a new developed self-reductive hydrothermal method, of which the gas-sensing properties were enhanced significantly. The SnO2 hierarchical nanoflowers were composed of well-defined nanosheets with a specific surface area of around 84 m2/g. Gas sensors made of pure and Au-doped SnO2 were fabricated, and their gas-sensing properties were characterized. The 1.0 at.% Au-loaded SnO2 sensor prepared by the new developed self-reductive method showed much more excellent selectivity toward ethanol at 200 °C than the one prepared with the conventional hydrothermal method. Its response to ethanol was around 3 times higher than that of the pure SnO2 sensor. A very wide detection range of 1–500 ppm for ethanol, good repeatability, and long-term stability were also approved.

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Copyright © Materials Research Society 2019 

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