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18 results on '"Arab, Shermin"'

16. Solvothermal synthesis of a highly branched Ta-doped TiO2.

Author

Arab, Shermin, Dongsheng Li, Kinsinger, Nichola, Zaera, Francisco, and Kisailus, David

Subjects
TANTALUM, TITANIUM dioxide, SCANNING electron microscopy, ELECTRON microscopy, ALKOXIDES
Abstract

We present a low-temperature, hydrothermal synthesis method for Ta-doped TiO2. Here, alkoxide-based precursors are mixed at low temperatures to suppress differential hydrolysis and phase separation. This method ensures homogeneous, molecular mixing of the Ta dopant with the native oxide up to a concentration of ∼ 2.5 at.%. X-ray diffraction and energy dispersive spectrometer analyses confirm a uniformly doped rutile TiO2. Scanning electron microscopy and transmission electron microscopy analyses reveal a highly branched structure. Optoelectronic properties of these structures were investigated using ultraviolet-visible spectroscopy and low-temperature photoluminescence. [ABSTRACT FROM AUTHOR]

Published
2011
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18. First principle calculation of stability and effects of doping on sulfur-doped TiO2

Author

Arab, Shermin and Lake, Roger

Abstract

In this paper, we present the band gap reduction effect of sulfur doping on TiO2in anatase phase. This study is based on Density Functional Theory (DFT). For these calculations, several types of supercells consisting of 48 atoms in anatase phase are used to study the optoelectronic properties and band gap energy of sulfur-doped TiO2. The band gap reduction effect of sulfur doping as a function of concentration is also studied here. The most stable substitution site for sulfur is predicted based on theoretical calculations. Based on the previous experimental results and the recent theoretical calculations in this paper, it is proven that sulfur doping is a promising approach for band gap reduction of TiO2for a wide variety of energy-based applications.

Published
2011
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