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Hierarchical aloe-like SnO2 nanoflowers and their gas sensing properties

Published online by Cambridge University Press:  08 May 2018

Jianling Hu Open the ORCID record for Jianling Hu [Opens in a new window] ,
Xingyang Li ,
Xiaodan Wang ,
Yan Li ,
Quanshui Li  and
Fengping Wang
Jianling Hu
Affiliation:
Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Xingyang Li
Affiliation:
Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA
Xiaodan Wang*
Affiliation:
Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Yan Li
Affiliation:
Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Quanshui Li
Affiliation:
Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Fengping Wang*
Affiliation:
Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Unique SnO2 monoflowers with an aloe-like morphology were successfully synthesized via a one-step hydrothermal method. The structural, chemical, and physical characteristics were investigated. The results exhibited that the as-prepared sample was assembled by triangle rutile SnO2 nanoslices with rough surfaces. A possible crystal growth and nanostructure assembling mechanism was proposed. The Raman peaks in 171, 235, and 211 cm−1 proved that a large amount of oxygen defects existed inside the sample, which might narrow the band gap from 3.6 eV of pure SnO2 to 2.7 eV of the sample. The sensor fabricated by aloe-like SnO2 nanostructures exhibited an excellent response and selectivity to ethanol. The developed sensor can detect ethanol as low as 10 ppm at 360 °C. The prepared aloe-like SnO2 microflower sensor exhibited a gas sensing response of about 7.46 when exposed to 100 ppm of ethanol gas at 360 °C, which was probably related to more numerous defects and thinner structure of aloe-like SnO2.

Keywords

hydrothermalnanostructuresensor
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 10 , 28 May 2018 , pp. 1433 - 1441
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Copyright
Copyright © Materials Research Society 2018 

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