Abstract
Properties of In 2O 3, In 2O 3–SnO 2 and In 2O 3–NiO ceramic and thin film sensors formed starting from colloidal solutions for the detection of CO and NO 2 are compared. Obtained results are discussed taking into account the redox mechanism of the conductivity changes. The additives affect gas-sensitive properties of In 2O 3 in two ways: (i) changing the activity of In 2O 3 when interacting with analyzed species by the change of Fermi energy, and (ii) directly participating in a chemical reaction with analyzed species.
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