Recent advances in the synthesis, characterization of pure, doped and hybrid NiO nanoparticles composite for gas sensor applications

Abstract

The gas sensor market is expected to grow at a CAGR of 8.7% from 2021 to 2026, from a market value of USD 2.50 and 4.39 billion and metal oxide sensor (MOS) gas sensors are slowly replacing other convections gas sensors in all engineering applications. But the metal oxide semiconducting gas sensor has limited usage due to high temperature, greater power consumption, short term stability and its susceptibility towards humidity. In this context many researcher were attempted to develop MOS gas sensors capable of sensing gases at higher operating temperature but only few works investigated the sensor lower temperature dependency on transition metal dopants. The objective of the present research work is to investigate the effect of transition metal ion doping on Nickel oxide sensor capabilities towards various gas reported by various research groups. Nickel oxide is used as base material of the sensor because of its p-type semiconducting behaviours and its long term stability, transition metals like Cu, Co and Zn are used as dopants because of their good thermal and electrical conductivity. In this short review article, the pure and doped NiO metal oxide nanoparticles prepared by various research groups were methods are consolidated and their detailed characterisation using XRD, SEM, UV-Vis, TEM, and Raman were also discussed. The development of sensor device using NiO nanoparticles and investigation of its sensing property for various gasses such as methane, ethanol, CO, H2, NH3, NO2, H2S etc were discussed in detail. At the end all the sensing results were correlated and proposed the suitable conditions, nanoscaled NiO for better sensor applications.