Studying the gas sensing characteristics of biosynthesised ZnO nanoparticles

An experimental study describes the gas sensing characteristics of biosynthesised ZnO nanoparticles toward a group of volatile organic compounds (VOCs) like benzene, acetone, formaldehyde, methanol and ethanol.

A laboratory.
It was demonstrated that the glass transition temperature of the final crosslinked network could be controlled by the addition of a monoallylated monomer. Image source: kwanchaift - (symbol image).

During the study, also the effect of doping of different concentrations of silver nanoparticles in ZnO to improve the sensing response of the mentioned VOCs has also been studied. The structural analysis of the synthesised nanoparticles was carried out using X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The morphological investigations were performed using high-resolution transmission electron microscopy (HRTEM). Elemental analysis of the synthesised thin film was carried out by energy-dispersive X-ray spectroscopy (EDX). The gas sensing properties for pure ZnO and Ag-doped ZnO thin films were carried out for different (VOCs). On the basis of experimental results, the optimised Ag-doped ZnO nanoparticles were used for the measurement of gas sensing properties of ethanol gas.

Ag-ZnO exhibits improved sensitivity

The observed gas sensor response has been explained using a chemisorption-based sensing mechanism in metal oxide semiconductor devices. Different sensing parameters like sensitivity, sensor response and recovery time have been measured. The sensor response of both materials has been compared with different concentrations of targeted VOCs. It has been observed that Ag-ZnO exhibits improved sensitivity as compared to pure ZnO. The optimised Ag(15%)ZnO thin films were found to be more selective toward ethanol with ~81% sensor response at 250 °C.

The study has been published in Journal of Coatings Technology and Research, Volume 19, 2022.

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