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Nakaruk A. Lin C. Y. W. Channei D. Koshy P. Sorrell C. C. 《Journal of Sol-Gel Science and Technology》2012,61(1):175-178
Thin films of TiO2 doped with Fe and Mn were deposited on F-doped SnO2-coated glass by spin coating. Dopant concentrations of 3–7 wt% (metal basis) were used. The structural, chemical, and optical
characteristics of the films were investigated. Laser Raman microspectroscopy and glancing angle X-ray diffraction data showed
that the films consisted of the anatase polymorph of TiO2. X-ray photoelectron spectroscopy data indicated the presence of Fe3+, Mn4+, and Mn3+ in the doped films, as predicted by calculated thermodynamic stability diagrams, and the occurrence of atomic disorder and
associated structural distortion. Ultraviolet–visible spectrophotometry data showed that the optical indirect band gap of
the films decreased significantly with increasing dopant levels, from 3.36 eV (undoped) to 2.95 eV (7 wt% Fe) and 2.90 eV
(7 wt% Mn). These improvements are attributed to single (Fe) or multiple (Mn) shallow electron/hole trapping sites associated
with the dopant ions. 相似文献
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A. Nakaruk C. Y. Lin D. S. Perera C. C. Sorrell 《Journal of Sol-Gel Science and Technology》2010,55(3):328-334
Essentially fully dense titania thin films were spin coated on fused quartz substrates under identical conditions and subjected
to annealing over the range 750°–900°C. The films were of a consistent ~400 nm thickness. The anatase → rutile phase transformation
temperature was between 750°C and 800°C, with first-order kinetics; annealing at 900°C yielded single-phase rutile. Silicon
contamination from the fused quartz substrate was considered to be critical since it suppressed both titania grain growth
(maintaining constant grain size) and the phase transformation (occurring at an unusually high temperature); its presence
also was considered to be responsible for the formation of lattice defects, which decreased the transmittances and the band
gaps. 相似文献
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