Abstract
Gold–alginate bionanocomposite films were prepared by impregnation of alginate films withHAuCl4 followed by reduction with glucose. The mannuronate over guluronate ratio (M/G) of the polymer as well as the initial polymer concentration wereshown to influence the film thickness, the amount of trappedAu3 + ions, and the volume fraction of Au(0) nanoparticles but not the size of these colloids(about 4 nm). The homogeneity of the gold colloid dispersion within the alginate gels wasstudied by transmission electron microscopy (TEM) and confirmed by simulation of thesurface plasmon resonance (SPR) spectra using the Maxwell–Garnett model. Thecalculated spectra also provided fruitful information about the gold colloid/alginateinterface. Overall, the whole process is controlled by the balance between theM/G ratio, defining the polymer affinity for Au(III) species, and the solution viscosity,controlling the diffusion phenomena.
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