Effect of ZnO morphologies on its sensor response and corresponding E-nose performance

•ZnO has been synthesised into three different nanoforms, nanogranules, nanowires, nanoflowers.•Partial specificity towards H2S, NO and the mixture is achieved.•Incorporation of Pt is responsible for the change in the morphology from nanowires to nanogranules.•Regression analysis indicates that a wise selection of combination of sensors gives better prediction accuracy.