Synthesis of porous SnO2 films by electrochemical anodizing

Abstract

The results of the investigation of the microstructural and the optical properties of tin oxide films obtained by electrochemical oxidation are presented in the article. Synthesis was conducted anodized dioxide tin in aqueous solution of sodium hydroxide and oxalic acid. Synthesis of porous tin dioxide was carried out by singlestep or multistage methods. The time characteristics of the anodizing process in various electrolytes have been studied. There is a different nature of the time dependence of magnitude of the current anodizing from the chemical composition of the electrolyte. Obtained electron microscopic pictures membranes porous dioxide. The pore sizes of the tin dioxide films were determined. Microanalysis of the quantitative elemental composition of the films showed the formation of SnO2 oxide in the process of electrochemical anodization. The luminescence and Raman scattering spectra of SnO2 films obtained in various electrolytes during the one-stage and two-step methods of synthesis have also been studied. The change in the chemical composition of the electrolyte used or the method of synthesis of tin dioxide films does not lead to the appearance of additional luminescence bands in the luminescence spectra. There is only redistribution in the intensities of the existing luminescence bands. Spectra of Raman scattering of films obtained in NaOH correspond to the literature data. In the case of anodizing in an electrolyte based on H2C2O4, the Raman scattering spectra differ from the spectra observed for the SnO2 film anodized in NaOH and for tin dioxide nanostructures obtained in other studies. At the same time spectra of Raman scattering films the same with the one-stage and two-stage methods of synthesis.