The results of the synthesis of Ag-TiO 2 nanostructures were presented. The optical properties of silver nanoparticles and Ag-TiO 2 structures were studied. The size and shape of Ag-TiO 2 nanostructures were determined. The electron density in silver, the damping constant of plasma oscillations, and the ratio between the masses of the Ag core and the TiO 2 shell were determined from the absorption spectra of Ag and Ag-TiO 2 solutions. It was shown that the semiconductor shell of titanium dioxide leads to a decrease in the electron density in silver nanoparticles and the damping constant of plasma oscillations.