Recent Advances in the Synthesis, Characterization of Pure and Doped NiO Nanostructures for Gas Sensor Applications

Abstract

Nowadays developing the nanomaterials for the sensors capable of sensing at low temperature is given prime importance. In line with this review describes the latest investigations on the effect of metal ion doping on nickel oxide (NiO) sensor capabilities towards various gases. NiO is used as base material of the sensor because of its p-type semiconducting behaviors and its long term stability. Transition metals like Fe, W, Cu, Sn, Nb, In, Ti, and Zn are used as dopants because of their good thermal and electrical conductivity. In this short review article, various synthesis approaches to prepare doped NiO nanostructures and their structural feature are discussed. The development of a sensor device using doped NiO nanostructures and investigation of its sensing property for various gases such as xylene, methane, ethanol, butanol, NO2, etc. are discussed in detail. At the end, all the sensing results were correlated and proposed the suitable conditions to develop the potential doped nanoscaled NiO for better sensor applications.