Influence of La(III) on the reactivity and sensor properties of nanocrystalline SnO2

Resumo

Synthesis of Sn(IV) and La(III) based nanocomposites has been effectuated. According to the data obtained by XRD and TPR-H₂ methods, it is supposed that La in nanocompites is located in amorphous La₂Sn₂O₇ segregation. The effect of La(III) on the adsorption properties of SnO₂ surface and concentration of chemisorbed oxygen was determined. Sensor properties of obtained materials towards 10 ppm of CO in air were studied by in situ DC conductance measurements. It is shown that La introduction allows to increase sensor response of SnO₂ during CO detection in air.