Phase control of yttrium (Y)-doped TiO2 nanofibers and intensive visible photoluminescence
- Authors
- Kumar, Koppala Siva; Song, Chan-Geun; Bak, Geon Myeon; Heo, Gaeun; Seong, Maeng-Je; Yoon, Jong-Won
- Issue Date
- Dec-2014
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Y-doped TiO2 nanofibers; Electrospinning; Raman; UV-Visible diffuse reflectance; Photoluminescence
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.617, pp 683 - 687
- Pages
- 5
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 617
- Start Page
- 683
- End Page
- 687
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/11477
- DOI
- 10.1016/j.jallcom.2014.08.067
- ISSN
- 0925-8388
1873-4669
- Abstract
- Yttrium (Y)-doped TiO2 nanofibers were successfully fabricated by electrospinning and the subsequent calcination of the as-spun nanofibers. The X-ray diffraction and Raman scattering results showed that the incorporation of Y into TiO2 impedes the rutile-phase growth, facilitates the anatase phase growth. Estimated grain sizes are reduced from 15.71 nm to 8.8 nm with increasing Y-doping concentration. Raman scattering studies confirm the existence of slight brookite phase in case of Y-doped TiO2 nanofibers. Field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM) images revealed that the nanofibers comprised of nanoparticles and that Y-doping reduced the nanoparticle size. The optical band gap energy increased with increasing Y-doping, which can be ascribed to both quantum confinement effect and pure anatase phase transformation from mixed rutile-anatase phase. Y-doping induced a blue-shift of the broad visible photoluminescence (PL) peak and an increase of PL intensity with the concurrent decrease grain size. For 3 at.% Y-doped TiO2 nanofibers PL intensity enormously increased due to defect-related centers on the surface. (C) 2014 Elsevier B.V. All rights reserved.
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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