Colloidal dispersions of Au nanoparticles in polysiloxane (PSi) were prepared by mixing chloroauric acid dissolved in acetone with the vinyl-terminated Psi precursor, following by addition of Si-H containing precursor and in-oven curing at 60oC for 24 hrs. During the curing procedure, reduction of Au(III) to the zero-valent Au takes place. Absorbance and fluorescence spectra of prepared Au/PSi nanocomposites are investigated and compared with the spectra of colloidal dispersion of Au nanoparticles in PSi containing different concentrations of four polymethine dyes, introduced in vinyl-terminated Psi precursor before curing. In several cases it was found that the presence of Au nanoparticles is able to enhance the emission efficiency of dye molecules, probably due to resonance energy transfer process. The influence of the nature of dyes, as well as their concentration and concentration of nanoparticles on the fluorescence properties of investigated nanocomposites are discussed.

Experimental study of absorbance and fluorescence spectra of colloidal dispersion of Au nanoparticles in solid solutions of organic dyes in polysiloxane

247th National Meeting (2014)

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