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AC Conductivity and Diffuse Reflectance Studies of Ag-TiO2 Nanoparticles

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Abstract

Silver (Ag)-TiO2 nanoparticles synthesized by a low-temperature hydrothermal method in the anatase phase have been investigated by x-ray diffraction. Transmission electron microscopy has been used for morphological studies. Surface areas were studied by the Brunauer–Emmett–Teller method. Alternating-current (AC) conductivity and dielectric properties were studied for various dopant levels of 0.25 wt.%, 0.5 wt.%, and 1.0 wt.% at 300 K in the frequency range from 42 Hz to 5 MHz. AC conductivity and dielectric properties of TiO2 nanoparticles were greatly affected by loading with Ag. At high frequencies, the materials showed high AC conductivity and low dielectric constant. Diffuse reflectance studies were carried out for various dopant levels at 300 K by ultraviolet–visible (UV–Vis) spectroscopy. Considerable absorption of visible light by 0.5 wt.% and 1.0 wt.% Ag-TiO2 nanoparticles was observed due to the decrease of the energy band gap on Ag loading.

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Authors and Affiliations

  1. Department of Physics, University of Calicut, Malappuram, 673635, Kerala, India

    A.K. Abdul Gafoor, M.M. Musthafa & P.P. Pradyumnan

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  1. A.K. Abdul Gafoor
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  2. M.M. Musthafa
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  3. P.P. Pradyumnan
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Correspondence to A.K. Abdul Gafoor.

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Abdul Gafoor, A., Musthafa, M. & Pradyumnan, P. AC Conductivity and Diffuse Reflectance Studies of Ag-TiO2 Nanoparticles. J. Electron. Mater. 41, 2387–2392 (2012). https://doi.org/10.1007/s11664-012-2174-7

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  • DOI: https://doi.org/10.1007/s11664-012-2174-7

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