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Optoelectronic properties correlation to preparation of Au/La-oxide nanocomposite films

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Author(s): Dakhel A.A.

Journal: Science of Sintering
ISSN 0350-820X

Volume: 45;
Issue: 2;
Start page: 189;
Date: 2013;
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Keywords: optical properties | Au-incorporated La oxide | composite materials | annealing in H2 gas | gold plasmon

ABSTRACT
Gold nanoparticles were grown in La-oxide thin films deposited on quartz and silicon substrates. These films were annealed in pure hydrogen gas atmosphere at 300°C for different durations 15 min, 30 min, and 45 min and characterised by the X-ray fluorescence (XRF) and X-ray diffraction. The matrix La-oxide remained amorphous up to 400°C. The fraction of Au in La-oxide host material was 7 % molar with crystallite size of 6.8 nm. The Au NPs slightly grew by annealing in H2 gas at 300 K. The samples were investigated by UV-Vis-NIR absorption spectroscopy and dc-electrical measurements. They exhibit conducting properties and with H2 gas annealing, they showed red shifting of the bandgap with remarkable reduction of optical absorption coefficient by ~25 % and remarkable increase in electrical conductivity ~124 %. A global study of the influence of low-temperature post annealing in H2 gas on the electrical, structural, optical, and optoelectronic properties was conducted.
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