Properties of CdxZn1-xO thin films and their enhanced gas sensing performance

CdxZn1-xO(0 ≤ x ≤ 0.20) thin films with different Cd concentrations were successfully deposited on glass substrate using spray pyrolysis technique. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDAX) were used for structural, surface morphological...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-10, Vol.720, p.39-46
Main Authors: Bharath, S.P., Bangera, Kasturi V., Shivakumar, G.K.
Format: Article
Language:English
Subjects:
Acetone
Cadmium
CdZnO thin films
Electrical resistivity
Ethanol
Gas sensor
Gas sensors
Glass
Methanol
Morphology
Organic compounds
Probe method (forecasting)
Scanning electron microscopy
Spray pyrolysis
Spray pyrolysis technique
TCO
Thin films
Transmittance
VOCs
Volatile organic compounds
X ray analysis
X-ray diffraction
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Summary:CdxZn1-xO(0 ≤ x ≤ 0.20) thin films with different Cd concentrations were successfully deposited on glass substrate using spray pyrolysis technique. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDAX) were used for structural, surface morphological and compositional characterization. The XRD analysis revealed that the synthesized films were hexagonal in structure with (002) orientation. The SEM studies confirm the formation of homogeneous and uniform films. Optical transmittance and electrical conductivity of the films were evaluated using UV–Visible spectroscopy and two probe method respectively. The optical studies showed that the CdxZn1-xO thin films have optical transmittance in entire visible region. The resistivity of undoped films were very high and it decreases with addition of cadmium. The gas sensing properties were investigated at optimal temperature of 350 °C for various volatile organic compounds like acetone, ethanol and methanol. The CdxZn1-xO thin films with 10 at. % cadmium concentration showed the sensitivity of 50% for 1 ppm ethanol. •CdxZn1-xO thin films have been synthesized using spray pyrolysis technique.•Incorporation of Cd into ZnO modifies the surface morphology, electrical and optical property.•CdxZn1-xO thin films exhibit the good sensing property for volatile organic compounds.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.05.240