Preparation of silver-titanium dioxide core-shell (Ag@TiO2) nanoparticles: Effect of Ti-Ag mole ratio
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Author list: Angkaew S., Limsuwan P.
Publisher: Elsevier
Publication year: 2012
Volume number: 32
Start page: 649
End page: 655
Number of pages: 7
ISSN: 1877-7058
Languages: English-Great Britain (EN-GB)
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Abstract
Silver-titanium dioxide core-shell (Ag@TiO2) nanoparticles were prepared via a reduction reaction of silver nitrate followed by a sol-gel process of titanium tetraisopropoxide (TTIP). The silver core was prepared from 10 ml of 5- mM silver nitrate solution with hydrazine as a reducing agent, and cetyltrimethylammonium bromide as a stabilizing agent. The resulting solution was treated with 1 ml of TTIP solution in ethanol with concentration between 1, 2, 3, 4 and 5 mM (mole ratios of Ti:Ag were 2, 4, 6, 8, and 10 %, respectively). Morphology of the resulting materials was investigated by transmission electron microscope (TEM). The TEM results showed that the core-shell (Ag@TiO 2) structure was found only in solutions with low Ti:Ag mole ratio (2-6 %) while the composite morphology with Ag particles randomly embedded in TiO2 matrix was found with higher Ti:Ag mole-ratio. The Ag@TiO 2 particles contain silver core (diameter of 10-15 nm) surrounded by the TiO2 shell with the shell thickness of 10-20 nm in the solution with 2% mole-ratio and 20-50 nm in that with 6% mole-ratio. Optical spectrometric measurements found that the surface plasmon resonance (SPR) peak of silver nanoparticles was red-shifted from about 410 nm (in solution of silver nanoparticles) to about 425-430 nm (in the solutions of Ag/TiO2 nanoparticles) and it was not significantly affected by the content of TiO 2. ฉ 2010 Published by Elsevier Ltd.
Keywords
Core shell, silver, Silver/Titanium dioxide, titanium dioxide
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