Fedorenko G. Physico-chemical, catalytic and gas sensitive properties to methane of Рt, Pd-containing sensor materials based on SnO2

The thesis is devoted to establish relationship between physico-chemical properties, morphology, state of surface layers of nanosized Pd,Pt-containing materials based on SnO2, their catalytic activities in a reaction of CH4 oxidation and characteristics of created adsorption semiconductor sensors based on the materials for detection of small concentrations of CH4 in air. The stabilizing effect of Pd and Pt on the particle size of nanomaterials was established. The stabile sensors with high response values, small response and recovery time and wide range of measurement CH4 concentration were created. The influence of the Pd and Pt additives on the gas sensitive properties was clarified based on the obtained data. Mechanism of the sensor sensitivity to CH4 of the adsorption-semiconductor sensors and a mathematical model of sensor action were proposed.