Synthesis and Characterization of Titania-Coated Silver Nanoparticles

Authors: Amar Kumbhar; George Chumanov

Source: Journal of Nanoscience and Nanotechnology, Volume 4, Number 3, March 2004 , pp. 299-303(5)

Publisher: American Scientific Publishers

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Abstract:

Silver particles of 70 ± 10 nm mean diameter were coated with uniform layers of amorphous titania by the hydrolysis and polycondensation process using titanium(IV) n-butoxide in aqueous solution. Because of the large dielectric function of titania, a shift to the longer wavelengths was observed for the plasmon resonance maximum of coated silver nanoparticles. By changing the alkoxide to particles ratio in the reaction mixture, thickness ranging from 5 to 20 nm was obtained. Hydrothermal treatment performed on coated particles at 350°C for 4 h converted amorphous titania to the anatase crystalline form. The anatase form was confirmed by X-ray powder diffraction. More red shift of the plasmon resonance was observed for the hydrothermally treated samples compared with the particles coated with amorphous titania.

Keywords: TITANIA; SILVER; NANOPARTICLES; PLASMON RESONANCE; SOL-GEL; HYDROTHERMAL

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2004.032

Publication date: 2004-03-01

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Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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