Monitoring Gas Sensors at Work: Operando Raman-FTIR Study of Ethanol Detection by Indium Oxide

摘要

Metal-oxide semiconductors such as ln2O3 have been used widely as gas sensing materials because of their high sensitivity to target gases and their simple fabrication.11"31 Their operation is based on changes in the electrical conductivity of the material through adsorption of gas molecules on the surface of the semiconductor. Despite progress in the field, a detailed mechanistic understanding of the gas sensing process is still lacking. The knowledge-based development of better gas sensors with increased selectivity and sensitivity will crucially depend on the development of experimental approaches which allow for simultaneous measurement of the sensor response, adsorbed species, changes in the metal-oxide material, and gas-phase composition (operando approach). Ultimately, by correlating these results, the mode of operation of gas sensors can be elucidated.