The surface species responsible for NO gas sensing over indium oxide was studied by operando DRIFTS coupled to a multivariate spectral analysis. It revealed the important roles of surface nitrites on the temperature-dependent gas sensing mechanism and the interaction of such nitrites with surface hydroxyls. A highly hydroxylated surface with high concentration of surface adsorbed HO is beneficial to enhance the concentration of adsorbed NO, present as nitrites, thus explaining superior sensing response at lower operating temperatures.
Selective detection of oxidising or reducing species is achieved via selecting operating temperatures and metal loading of single crystalline In2O3 octahedra.
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