期刊
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
卷 71, 期 -, 页码 61-68出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2017.07.004
关键词
Titanium dioxide; Gd ions; Photocatalysis; Reactive oxygen species
类别
资金
- National Authority for Scientific Research and Innovation - ANCSI, Core Programme [PN16 30-02 02]
Gd doped TiO2 nanoparticles with different dopant concentration were prepared by sol-gel method. The crystalline structure of all samples corresponds to the tetragonal anatase phase. Gds(3+) doping inhibit the grain size and increase the micro-strains. The decrease of the nanoparticles size by doping was evidenced by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). Specific bands of brookite phase appear in Raman spectra. Electron Spin Resonance (ESR) spectroscopy and high resolution transmission electron microscopy (HRTEM) proved the presence of Gd3+ ions substitutionally incorporated at Ti4+ sites of TiO2 lattice. All the samples show photocatalytic activity against RhB and the best performance was obtained using 0.3% Gd-doped TiO2 nanoparticles. The presence of hydroxyl radical at the solid liquid interface was evidenced using ESR experiment coupled with spin-trapping technique and their influence on photocatalytic activity of the samples was highlighted. With increasing Gd doping level a little increase of the optical band gap was determined.
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