We have conducted a comparative study of the synthesis conditions for mesoporous materials and films based on tin dioxide in the presence of different types of templates, and we have studied their thermal stability and sorption properties. We demonstrate the advantage of using alcoholic reaction media and nonionic templates (triblock copolymers to obtain thin films of mesoporous SnO 2 with relatively high parameters for the porous structure (V meso = 0.15 cm 3 /g, S BET = 147 m 2 /g) and cassiterite crystallite sizes down to 2.7 nm, significantly smaller than the thickness of the walls.The increased interest in studying oxide semiconductor materials over the past decade is because of their promising catalytic, photocatalytic, and optical (in particular, luminescent, photochromic, etc.) properties. Tin dioxide is a wide-gap n-type semiconductor and is used mainly as a catalyst for oxidation of organic compounds, the working material for sensitive elements of conductimetric gas sensors mainly based on reducing gases H 2 , CO, and hydrocarbons [1,2], and also is a widely used material for electrodes in rechargeable lithium batteries [3]. Designing tin dioxide-based high-sensitivity materials for chemical sensors requires development and perfecting of reproducible methods for obtaining thermally stable films (thin layers) with an extended surface on different types of substrates. The sol-gel method and also the template synthesis method using surfactants hold a special place among the methods making it possible to substantially increase the specific surface area of tin dioxide. Moreover, synthesis of mesoporous oxides is associated with a number of difficulties connected with too rapid hydrolysis of precursors, crystallization of the oxides themselves (on the walls of mesoporous materials), and consequently breakdown of the mesostructure during detemplating. Among synthetic approaches making it possible to improve the stability and adsorption characteristics of mesoporous materials, we should single out the use of nonaqueous reaction media and inhibition of crystallization by introducing other hydroxides into the gel. The method for synthesizing mesostructural materials from alcoholic media using metal alkoxides makes it possible to obtain multicomponent materials with a homogeneous distribution of components over the entire volume, and to better control the process in the gel formation stage.The aim of this work was to develop and identify the conditions and characteristic features of a reproducible template method for obtaining thermally stable thin films based on mesoporous tin dioxide as working elements of chemical sensors, to determine the effect of various factors (nature of the template, composition of the reaction medium, aging and detemplating conditions, etc.) on their structural and sorption characteristics and thermal stability.As the basis for the method, we chose a procedure similar to that described in [4]. Anhydrous tin chloride was added to a solution of surfactant (Pluronic-127 or Pluronic-123) in...
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