Record Details

Effect of Post Air Annealing on the Characteristics of Spray Deposited ZnO Thin Films and Their use as MOS Ethanol Gas Sensor

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Effect of Post Air Annealing on the Characteristics of Spray Deposited ZnO Thin Films and Their use as MOS Ethanol Gas Sensor
 
Creator S, Prakasha G
R, Shashidhar
S, Madhukeswara R
 
Subject ZnO
Spray pyrolysis
Annealing
P type
Gas sensor
 
Description 212-221
Spray Pyrolysis (SP), a low-cost chemical procedure was employed to deposit ZnO thin films under optimum conditions
at 350 °C using a predetermined precursor concentration of 0.1 M. This study investigates how post-air annealing affects the
structural, compositional, morphological, optical, and electrical properties of ZnO thin films. The deposited films were
heated by air at 400, 450 and 500 °C for 1 h. X-ray diffraction, scanning electron microscope, x-ray dispersive spectroscopy,
Raman spectroscopy, Fourier Transform Infrared Spectroscopy, optical spectroscopy, and Hall effect studies were
conducted to investigate how post-air annealing alters the properties of the as-deposited film. XRD measurements show that
annealing resulted in the growth of polycrystalline hexagonal wurtzite without the formation of any other phases in ZnO
films. When heated to 500 °C, the estimated crystallite size of the as-deposited film increased from 6.22 nm to 6.57 nm. The
SEM show the creation of compact and tightly packed films, as well as the visible network of large grains during annealing.
Raman and FTIR studies have validated the chemical structure, molecular interactions, and formation of chemical bonds in
ZnO thin films. Optical studies show that the energy band gap widens during annealing. Optical profilometer studies
verified the uniformity of the deposited film surface. According to Hall effect analysis, conversion of p to n type occurs at
an annealing temperature of 450 °C. A ZnO-based MOS gas sensor was found to have better selectivity towards C2H5OH
than other test gases such as NH3, NO2, and H2S. At room temperature, the sensor response and recovery time is shorter for
NH3 than for C2H5OH test gas. In environmental monitoring, the present gas sensor can detect ethanol.
 
Date 2024-02-23T04:41:35Z
2024-02-23T04:41:35Z
2024-02
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/63395
https://doi.org/10.56042/ijpap.v62i3.6789
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJPAP Vol.62(03) [March 2024]