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Au nanoparticles and Au, Ag bimetal nanoparticles separately dispersed Al2O3 composite films were prepared by sol-gel method. The microstructure and optical property of the films were studied by transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS) and ultraviolet–visible (UV/vis) absorption spectra. Gold in Au/Al2O3, and gold and silver in AuAg/Al2O3 composite films exist...