We have studied the effect of doping mesoporous materials and films based on tin dioxide on their physical and chemical properties. We have studied their thermal stability, sorption, acid, and semiconductor properties. We demonstrate the advantages of using nanocomposites to obtain thermally stable layers (thickness~1 µm) with relatively high porous structural parameters (V tot = 0.460 cm 3 /g, S BET = 440 m 2 /g) and physical and chemical properties that can be varied in a targeted fashion.Today no resistive type gas sensor exists that has 100% selectivity with respect to a single gas. Therefore development of a system of gas sensors ("electronic nose") capable of selectively detecting chemically different gases or vapors is an important scientific and applied problem. In order to properly determine the concentration of an unknown analyte in real gas mixtures, we need to combine several sensor elements having different selectivities with respect to different types of substances.The change in electrical conductivity (the sensor signal) to a significant extent is determined by the type of semiconductor, the nature and concentration of active sites on its surface, and the structure of the material: the crystallite size, the degree of crystallite agglomeration, the specific surface area [1]. A very important problem in application of semiconductor oxide sensors is their low selectivity. With the aim of changing the properties of pure oxides (to improve thermal stability and selectivity of sensors based on them), systems (nanocomposites) are designed by introducing additives into the oxides: platinum group metal oxides or other oxides. For example, we know that addition of SiO 2 to tin oxide improves its thermal stability [2], addition of In 2 O 3 improves the sensor responses to ethanol vapor, H 2 , CH 4 , and CO [3], addition of Fe 2 O 3 improves response to ethanol vapor [1], addition of CeO 2 improves response to ethanol vapor [4], CH 4 , and CO [5], addition of V 2 O 5 improves response to NH 3 [1], addition of TiO 2 improves response to H 2 [6].The aim of this work is to investigate the possibility of controlling the physical and chemical properties of layers of materials based on mesoporous tin dioxide by varying the synthesis conditions and also the conditions for doping them with different oxides, including semiconductors.
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