A study on structure, morphology, optical properties, and photocatalytic ability of SrTiO 3 /TiO 2 granular composites
| Autor: | Nguyen Xuan Huy, Nguyen Van Minh, Le Thi Mai Oanh, Do Danh Bich, Doan Thi Thuy Phuong |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoluminescence Absorption spectroscopy Scanning electron microscope 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Lattice constant Absorption edge Transmission electron microscopy Photocatalysis Grain boundary Electrical and Electronic Engineering Composite material 0210 nano-technology |
| Zdroj: | Physica B: Condensed Matter. 532:37-41 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2017.04.028 |
| Popis: | (1-x)SrTiO3-xTiO2 granular composites with x=0.3, 0.4, 0.5, 0.6, 0.7, and 0.8 were synthesized by sol-gel process. Structure, morphology, optical properties, and photocatalytic activity were investigated in detail using x-ray diffraction (XRD) analysis, Raman scattering, field-emission scanning electron microscopy (FE-SEM), Transmission Electron Microscopy (TEM), ultraviolet-visible (UV–vis) absorption spectra, and photoluminescence (PL). XRD analysis showed the formation of single phase for parent phases and the present of two component phases in all composites without any impurity. A tight cohesion between TiO2 and SrTiO3 (STO) at grain boundary region was inferred from lattice parameter change of STO. Moreover, FE-SEM images revealed a granular structure of composite in which SrTiO3 particles were surrounded by smaller TiO2 nanoparticles. As TiO2 concentration increased, absorption edge firstly shifted to the left for composite with x=0.3 and then shifted gradually to the right with further increasing of TiO2 content from 30 mol% to 80 mol%. Composites exhibited a stronger photocatalytic activity than parent phases, with the highest efficiency at 50 mol% of TiO2. PL analysis result showed that the recombination rate of photogenerated electron-hole pairs decreased in composite sample, which partly explained the enhanced photocatalytic property. |
| Databáze: | OpenAIRE |
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