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Title: Photoluminescence and photocatalytic activity of flowerlike hierarchical TiO{sub 2}:Sm{sup 3+} microspheres

Graphical abstract: Flowerlike hierarchical TiO{sub 2}:Sm{sup 3+} microspheres were successfully prepared via a solvothermal method. The crystalline size decreased with increasing Sm{sup 3+} concentration. Each TiO{sub 2}:Sm{sup 3+} microsphere consists of several dozen nanopetals, which are composed of several aggregated nanothorns. Under 290, 360, 362, and 368 nm excitation, the {sup 4}G{sub 5/2} → {sup 6}H{sub 5/2}, {sup 4}G{sub 5/2} → {sup 6}H{sub 7/2}, and {sup 4}G{sub 5/2} → {sup 6}H{sub 9/2} transitions were observed. The luminescence intensity increased with increasing Sm{sup 3+} concentration, up to about 1.5 mol%, and then decreased abruptly. In addition to the aforementioned photoluminescence properties, TiO{sub 2}:Sm{sup 3+} microspheres can present photocatalytic activity for the degradation of RhB. - Highlights: • Flowerlike hierarchical TiO{sub 2}:Sm{sup 3+} microspheres were synthesized by a solvothermal method. • TiO{sub 2}:Sm{sup 3+} microspheres can present photocatalytic activity for the degradation of RhB. • The optical properties of TiO{sub 2}:Sm{sup 3+} microspheres with different Sm{sup 3+} concentration were studied in detail. - Abstract: Flowerlike hierarchical TiO{sub 2}:Sm{sup 3+} microspheres were successfully prepared via a solvothermal method. The results of the X-ray diffraction measurements revealed that the TiO{sub 2}:Sm{sup 3+} microspheres were anatase phase. The crystalline size of microspheres decreased with increasingmore » Sm{sup 3+} concentrations. Each TiO{sub 2}:Sm{sup 3+} microsphere consists of several dozen nanopetals, which are composed of several aggregated nanothorns. Under 290, 360, 362, and 368 nm excitation, the {sup 4}G{sub 5/2} → {sup 6}H{sub 5/2}, {sup 4}G{sub 5/2} → {sup 6}H{sub 7/2}, and {sup 4}G{sub 5/2} → {sup 6}H{sub 9/2} transitions were observed. The luminescence intensity increased with increasing Sm{sup 3+} concentration, up to about 1.5 mol%, and then decreased abruptly. The peak positions and the shape of emissions were independent of Sm{sup 3+} concentrations. In addition to the aforementioned photoluminescence properties, TiO{sub 2}:Sm{sup 3+} microspheres can possess superior photocatalytic activity for the degradation of RhB. In addition, the BET surface areas increased with increasing Sm{sup 3+} concentrations, which should be benefit for RhB adsorption.« less
Authors:
 [1] ;  [1] ; ;  [2] ; ; ; ; ;  [1]
  1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)
  2. State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22345213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 50; 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; ADSORPTION; EXCITATION; OPTICAL PROPERTIES; PEAKS; PHOTOCATALYSIS; PHOTOLUMINESCENCE; SAMARIUM IONS; SYNTHESIS; TITANIUM OXIDES; X-RAY DIFFRACTION