Interaction of Water Vapor with SnO_2 Sensor Materials: a Comparison of DRIFTS and Resistance Measurements

摘要

Operando DRIFT spectroscopy together with resistance measurements was used to study sensitivity (here response change upon changing analyte concentration) of undoped SnO_2 materials to water vapors. The materials synthesized using different protocols were found to manifest very different sensitivity to water, as well as to H_2 and CO in dry and humid air. While for one of the materials (SnO_2 Ac) low sensitivity to water combines with similarity between evolution of two bands in OH region and resistance, another material (SnO_2 Cl), with high sensitivity to water vapors, manifests similarity with the resistance only for the broad band between 3590 and 3040 cm~(-1). Together with high sensitivity to water vapors the latter material shows higher sensitivity to CO in dry and humid air, while SnO_2 Ac showed higher sensitivity to H_2.