In:
Surface Review and Letters, World Scientific Pub Co Pte Ltd, Vol. 25, No. 01 ( 2018-01), p. 1850046-
Abstract:
In this research, gas sensing characteristics of undoped and zinc-doped molybdenum trioxide (MoO[Formula: see text] thin films toward ethanol vapor were investigated. Thin films were deposited using low cost and simple technique of spray pyrolysis on top of glass substrates at 450[Formula: see text] C. Effects of addition of Zn, as an impurity, on the surface morphology, structural and optical properties of MoO 3 thin films were also investigated. X-ray diffraction (XRD) pattern analysis showed that by increasing the amount of impurity, crystal structure changes from orthorhombic [Formula: see text]-MoO 3 to two new phases of monoclinic [Formula: see text]-ZnMoO 4 and Mo 5 O[Formula: see text] reduced phase. Field emission scanning electron microscope (FESEM) images showed that by increasing the amount of impurity up to 5[Formula: see text] at.%, grain sizes decrease to about 60[Formula: see text]nm. UV–Vis analysis showed that by increasing the percentage of impurity the band gap of thin films increases. Gas sensing properties of samples were studied at three temperatures of 200[Formula: see text] C, 250[Formula: see text]C and 300[Formula: see text] C toward different concentrations of ethanol vapor. Gas response of 5[Formula: see text]at.% Zn-doped MoO 3 thin film reached the maximum value of [Formula: see text]% when it exposed to 1000[Formula: see text] ppm of ethanol vapor. Response and recovery times for all samples were reported at different temperatures.
Type of Medium:
Online Resource
ISSN:
0218-625X
,
1793-6667
DOI:
10.1142/S0218625X18500464
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2018
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