Sputtered SnO2/ZnO Heterostructures for Improved NO2 Gas Sensing Properties

Bharat Sharma; Ashutosh Sharma; Monika Joshi; Jae-ha Myung

doi:10.3390/chemosensors8030067

Chemosensors (Aug 2020)

Sputtered SnO2/ZnO Heterostructures for Improved NO2 Gas Sensing Properties

Bharat Sharma,
Ashutosh Sharma,
Monika Joshi,
Jae-ha Myung

Affiliations

Bharat Sharma: Department of Materials Science and Engineering, Incheon National University, Incheon 22012, Korea
Ashutosh Sharma: Department of Materials Science and Engineering and Department of Energy Systems Research, 206-Worldcup-ro, Yeongtong-gu, Suwon 16499, Gyeonggi-do, Korea
Monika Joshi: Amity Institute of Nanotechnology, Amity University, Noida, Uttar Pradesh 201313, India
Jae-ha Myung: Department of Materials Science and Engineering, Incheon National University, Incheon 22012, Korea

DOI: https://doi.org/10.3390/chemosensors8030067
Journal volume & issue: Vol. 8, no. 3
p. 67

Abstract

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A highly sensitive and selective NO2 gas sensor dependent on SnO2/ZnO heterostructures was fabricated using a sputtering process. The SnO2/ZnO heterostructure thin film samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). Sensors fabricated with heterostructures attained higher gas response (S = 66.9) and quicker response-recovery (20 s, 45 s) characteristics at 100 °C operating temperature towards 100 ppm NO2 gas efficiently in comparison to sensors based on their mono-counterparts. The selectivity and stability of SnO2/ZnO heterostructures were studied. The more desirable sensing mechanism of SnO2/ZnO heterostructures towards NO2 was described in detail.

Published in Chemosensors

ISSN: 2227-9040 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry: Biochemistry
Website: http://www.mdpi.com/journal/chemosensors

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