The template sol-gel method for synthesis of tin (iv) oxide nanoparticles

Abstract

Background . It is known that the presence of templates greatly affects on physical and chemical properties of the synthesized powders. Therefore, investigation of powders synthesis SnO 2 in the presence and absence of templates by sol-gel method are scientific and practical interest. O bjective . The purpose this paper was synthesis of SnO 2 nanoparticles in absence and presence of template non-ionic type (ethylene glycol and PEG) by sol-gel method and characterization of obtained powders. M ethods . In paper synthesized the tin (IV) oxide powders by sol-gel method with and without the use of templates. The ethylene glycol and polyethylene glycol with a molecular weight of 6000 (PEG 6000) was used as templates. R esults . The minimum temperature for crystallization of hydrated tin (IV) oxide powders is defined by thermal analysis. It is found that the heat treatment under these conditions leads to the formation of the polycrystalline powders pure rutile modification with a low degree of crystallinity and with a structure approximated to amorphous state. It is shown that the sol-gel method produces nanocrystalline (0.8–3.5 nm) and nanoparticulate (10–15 nm) powders of tin oxide (IV), and the use of template-PEG 6000 2–4 times reduces the size of crystallites. It is shown that the increase in mass of content template PEG-6000 from 1 to 10–75 % results in a slight distortion of the crystal lattice of tin oxide (IV). The calculated value of the bandgap for SnO 2 is equal to 3,69 eV. This value is in good agreement with literature data. Conclusions. The use of sol-gel method allows to obtain of nanoparticle SnO 2 powders, and template –significantly smaller crystallite size SnO 2 (to 0.8 nm). It is shown that minimum temperature for receiving of crystalline SnO 2 is 350 °C.