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Background: Semiconductor-doped glasses are treated actively through manyyears and continue to be of great interest because challenged features ofnanosized semiconductors of various chemical nature. Copper chalcogenides havediscovered the plasmonic properties in line with quantum confinement effectsspecific for major of semiconductor nanoparticles. Objective: The aim of thiswork is to study structural and optical features of the sol-gel derived silicaglasses with copper selenide nanoparticles demonstrating appearance of theplasmonic light absorption in the near IR range. Method: The samples understudy were fabricated through an original sol-gel technique realizing thesimultaneous synthesis of copper selenide and sintering of mesoporous silica.The copper selenide glasses were characterized with X-ray diffraction (XRD),transmission electron microscopy (TEM) and optical absorption spectroscopy.Results: Formation of nanocrystalline Cu2-xSe particles of the size range fromtens nm through 100-150 nm is established with XRD and TEM techniques. Theprincipal optical properties are presented by the featured absorption in thevisible and near-IR ranges. Eg was evaluated for the direct transitions in therange of 2.10-2.36 eV. The plasmonic resonance in the nanoparticles due toincreased carrier concentration originated by intrinsic defectness of Cu2-xSenanoparticles with variable stoichiometry. Its energy can be controlled byCu/Se ratio in the synthesis procedure.

Structural studies of the silica sol-gel glasses doped with copper selenide nanoparticles with plasmonic resonance absorption