SnO2/Au multilayer heterostructure for efficient CO sensing

In this work, SnO2/Au multilayered heterostructures based gas sensors are fabricated to detect CO gas. The Sn/Au multilayer structure was grown by thermal evaporation method followed by oxidation at elevated temperature. The structural characterization of the grown structures was performed by X-ray...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-04, Vol.244, p.122741, Article 122741
Main Authors: Rehman, Bushra, Bhalla, Naman Kumar, Vihari, Saket, Jain, Shubhendra K., Vashishtha, Pargam, Gupta, Govind
Format: Article
Language:English
Subjects:
Carbon monoxide
Detection
Electrical properties
Electrons
Gas sensor
Gas sensors
Gold
Heterostructure
Heterostructures
High temperature
Multilayers
Oxidation
Photoelectrons
Photoluminescence
Sensitivity
SnO2
Spectrum analysis
Structural analysis
Tin
Tin dioxide
X ray photoelectron spectroscopy
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Summary:In this work, SnO2/Au multilayered heterostructures based gas sensors are fabricated to detect CO gas. The Sn/Au multilayer structure was grown by thermal evaporation method followed by oxidation at elevated temperature. The structural characterization of the grown structures was performed by X-ray diffraction (XRD) and the oxidation analysis was performed by X-ray photoelectron spectroscopy (XPS). The electrical properties of SnO2/Au multilayered heterostructures were studied in the temperature range from 25 °C to 300 °C and sensing of gas was performed for CO (100 ppm). A significant enhancement in CO sensing at 300 °C was observed in SnO2/Au multilayered heterostructures than pristine SnO2. The pristine SnO2 sensor displays a sensitivity of 30.81% while it increased to 67.46% in case of SnO2/Au multilayered heterostructures. The change in the sensitivity could be correlated with the oxygen deficiencies as observed in photoluminescence spectra. •Formation of Au/SnO2 multilayer heterostructure based CO gas sensors.•Correlation of sensing mechanism with the oxygen vacancies in PL spectra.•Structural, optical & Sensing behavior analysis of Au/SnO2 multilayered heterostructures.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2020.122741