Funct. Mater. 2020; 27 4: 695-702.

doi:https://doi.org/10.15407/fm27.04.695

Composite materials based on nanoporous SiO2-matrices and TiO2 nanoparticles

O.N.Bezkrovnaya1, I.M.Pritula1, O.M.Vovk1, Yu.A.Gurkalenko2, A.N.Shaposhnik3, D.S.Sofronov3, Y.V.Taranets1

1Institute for Single Crystals, STC Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
2Institute for Scintillation Materials, SSI Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
3Division of Functional Materials Chemistry, STC Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine

Abstract: 

SiO2:TiO2 composites were obtained by saturation of SiO2-matrices (with a porosity of ~ 30 % and ~ 42 %) with a suspension of TiO2 nanoparticles and subsequent annealing to 700°C. It was shown that, due to annealing of the composites in the temperature range of 400-700°C, there was observed agglomeration of TiO2 nanoparticles in the pores of the SiO2-matrices, that manifested itself in an increase of the absorption in wavelength range of 390-800 nm. The presence of diffraction rings in the electron microdiffraction images confirms formation of TiO2 crystallites in SiO2:TiO2 composites. The content of titanium in the composite less than 1 % relative to silicon did not allow to reveal crystalline TiO2 phase in the composites by powder X-ray diffraction method. TiO2 is probably present in the composites based on SiO2-matrices with high porosity both in the form of crystallites and in amorphous state.

Keywords: 
SiO<sub>2</sub>-matrices, TiO<sub>2</sub> nanoparticles, composites, absorption.

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