Influence of substrate morphology on alcohol sensing behaviour of p-type CO_3O_4

摘要

An eco-friendly approach was adopted to fabricate porous MgAl2O4 ceramic substrate for designing a gas sensor. The active alcohol sensing component Co3O4 nanoparticles (Co3O4 NPs) were coated on dense and porous MgAl2O4 substrates using a wet chemical based dip coating technique followed by annealing in air at 400 degrees C. The morphology of the Co3O4 NPs found to be different for the porous and dense substrate. The Co3O4 NPs coated MgAl2O4 substrate-based sensor exhibited better alcohol sensitivity at low-temperature as compared to dense substrate counterpart. The porous substrate offers more active sites for gas adsorption and subsequent surface reaction leading to good sensitivity. (C) 2018 Elsevier B.V. All rights reserved.