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Nanostructured of SnO2/NiO composite as a highly selective formaldehyde gas sensor

Published online by Cambridge University Press:  10 September 2020

Lei Xu Open the ORCID record for Lei Xu [Opens in a new window] ,
Meiying Ge ,
Fang Zhang ,
Haijun Huang ,
Yan Sun  and
Dannong He
Lei Xu
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, PR China
Meiying Ge*
Affiliation:
National Engineering Research Center for Nanotechnology, Shanghai200241, PR China
Fang Zhang
Affiliation:
National Engineering Research Center for Nanotechnology, Shanghai200241, PR China
Haijun Huang
Affiliation:
National Engineering Research Center for Nanotechnology, Shanghai200241, PR China
Yan Sun
Affiliation:
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai200083, PR China
Dannong He
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai200240, PR China
*
a)Address all correspondence to this author. e-mail: meiyingge@163.com
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Abstract

To detect low concentrations of formaldehyde selectively, the sensing properties of SnO2 nanostructured are enhanced by modifying with p-type semiconductor NiO. In this study, a nanostructured SnO2/NiO composite was prepared by a simple hydrothermal method. The X-ray photoelectron spectroscopy (XPS) peak in 532.4 eV proved that the existence of the SnO2/NiO composite structure increased the amount of adsorbed oxygen O− and O2− significantly. Gas-sensing tests showed that these mixed phases SnO2/NiO are highly promising for gas sensor applications, as the gas response for formaldehyde was significantly enhanced in gas response, selectivity at an operating temperature of 230 °C. The sensor fabricated by SnO2/NiO composite can detect as low as 1 ppm of formaldehyde at 230 °C, and the corresponding response is 1.57. The results of physicochemical properties tests of the samples show that the enhancement in sensitivity and selectivity is attributed to the oxygen vacancies and heterojunction between SnO2 and NiO. The SnO2/NiO composites can be applied to sensitive materials of formaldehyde sensors.

Keywords

SnO2/NiO heterostructureformaldehydeselectivitygas sensing
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 22 , 30 November 2020 , pp. 3079 - 3090
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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