skip to main content

Title: Surface modification of sol–gel synthesized TiO{sub 2} nanoparticles induced by La-doping

The influence of La-doping in the range of 0.5–6.0 mol% on structural and morphological properties of TiO{sub 2} nanopowders synthesized by sol–gel routine has been investigated by XRPD, AFM, EDS and BET measurements, as well as Raman spectroscopy. The XRPD and Raman measurements have revealed the anatase phase as dominant in all nanopowders, with crystallite size decreasing from ∼ 15 nm in pure TiO{sub 2} to ∼ 12 nm in La-doped samples. The BET data suggest that all samples are fully mesoporous, with mean pore diameters in the range of ∼ 6–8 nm. The specific surface area and the complexity of pore structure are greater in doped samples than in pure TiO{sub 2} sample. The spectroscopic ellipsometry has apparently shown that the band gap has been gradually increased with the increase of La content. The STM and STS techniques have been used successfully to evaluate the surface morphology and electronic properties of La-doped nanopowders. All investigated properties have been related to photocatalytic activity, tested in degradation of a metoprolol tartrate salt (0.05 mM), and induced by UV-radiation. All doped samples showed increased photocatalytic activity compared to pure TiO{sub 2}, among which the 0.65 mol% La-doped sample appeared to be themore » most efficient. - Highlights: • Effects of La-doping on structural, morphological and electronic properties of TiO{sub 2} nanopowders. • Surface morphology and electronic properties of La-doped nanopowders evaluated by STM/STS. • Spectroscopic ellipsometry shown gradual increase of bandgap with the increase of La content. • Photocatalytic activity of samples was tested in degradation of MET under UV light.« less
Authors:
 [1] ;  [2] ;  [1] ;  [2] ; ;  [1] ;  [3] ;  [4] ; ;  [1]
  1. Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade (Serbia)
  2. Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad (Serbia)
  3. Faculty of Mining and Geology, Laboratory for Crystallography, University of Belgrade, Đušina 7, 11000 Belgrade (Serbia)
  4. Institute of Nuclear Sciences “Vinča”, University of Belgrade, 11001 Belgrade (Serbia)
Publication Date:
OSTI Identifier:
22288736
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 88; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMIC FORCE MICROSCOPY; DOPED MATERIALS; ELLIPSOMETRY; NANOSTRUCTURES; PHOTOCATALYSIS; POWDERS; RAMAN SPECTROSCOPY; SCANNING TUNNELING MICROSCOPY; SPECIFIC SURFACE AREA; TITANIUM OXIDES; ULTRAVIOLET RADIATION