What is the sensing mechanism of acetone on In2O3?

Label:chem

Topic
The widespread paradigm for gas-sensing with metal oxides is typically based on the surface reaction of gaseous analytes with pre-adsorbed oxygen species, often resulting in the total combustion of the analyte to produce CO2 and H2O.
Answer
The sensing mechanism for acetone on In2O3 is not based on the total combustion of acetone. Instead, the hydroxylated In2O3 surface decomposes acetone, which leads to the consumption of hydroxyl groups and the formation of adsorbed acetates. The overall consumption of surface oxygen resulting from this process is responsible for the observed increase in conductance during gas-sensing tests.
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