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• W2006231372 abstract "Photo-formation of gold nanoparticles in the solid monoliths of Au(III)-chitosan-silica aerogels with different Au/NH(2) molar ratios has been investigated using photoacoustic spectroscopy. Upon exposing to 320 nm UV light, a new absorption feature in the visible region around 525 nm could be seen due to the surface plasmon resonance of gold particles that are generated as a result of UV-induced reduction of Au(III) to Au(0). The plasmon band becomes stronger and shows saturation effects upon increasing the UV exposure time. A blue shift of about 7 nm is also noticed on exposing the sample (Au/NH(2)=1/5) for 6h, indicating a slight decrease in the nanoparticle size due to light-induced annealing with increasing the UV exposure time. The PA signals monitored as a function of chopping frequency show omega(-1) dependence, implying the thermally thin character of Au(III)-chitosan-silica aerogels." @default.
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• W2006231372 date "2008-08-01" @default.
• W2006231372 modified "2023-10-06" @default.
• W2006231372 title "Photo-formation of gold nanoparticles: Photoacoustic studies on solid monoliths of Au(III)–chitosan–silica aerogels" @default.
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• W2006231372 doi "https://doi.org/10.1016/j.saa.2007.09.011" @default.
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