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

TL;DR

This study investigates the structural and optical properties of silica glasses doped with copper selenide nanoparticles, revealing plasmonic resonance absorption in the near-infrared range and demonstrating control over resonance energy via synthesis parameters.

Contribution

It introduces an original sol-gel synthesis method for embedding copper selenide nanoparticles in silica glasses and characterizes their plasmonic properties for the first time.

Findings

Nanocrystalline Cu2-xSe particles formed within silica glasses.

Optical absorption features in visible and near-IR ranges.

Plasmonic resonance energy tunable by Cu/Se ratio.

Abstract

Background: Semiconductor-doped glasses are treated actively through many years and continue to be of great interest because challenged features of nanosized semiconductors of various chemical nature. Copper chalcogenides have discovered the plasmonic properties in line with quantum confinement effects specific for major of semiconductor nanoparticles. Objective: The aim of this work is to study structural and optical features of the sol-gel derived silica glasses with copper selenide nanoparticles demonstrating appearance of the plasmonic light absorption in the near IR range. Method: The samples under study were fabricated through an original sol-gel technique realizing the simultaneous 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 from tens nm through 100-150 nm is established with XRD and TEM techniques. The principal optical properties are presented by the featured absorption in the visible and near-IR ranges. Eg was evaluated for the direct transitions in the range of 2.10-2.36 eV. The plasmonic resonance in the nanoparticles due to increased carrier concentration originated by intrinsic defectness of Cu2-xSe nanoparticles with variable stoichiometry. Its energy can be controlled by Cu/Se ratio in the synthesis procedure.