One-pot synthesis of Ag nanoparticle/Ag-doped SiO2 composite film and their enhancement effect for CdSe QDs

Abstract

In this work, Ag nanoparticle/Ag-doped SiO2 composite films were prepared with AgNO3 and tetraethoxysilane precursors through a simple and environmentally friendly sol–gel method under high annealing temperatures. The effect of different annealing temperatures (400[Formula: see text]C, 500[Formula: see text]C, 600[Formula: see text]C, and 700[Formula: see text]C) on the structural and optical characters of the composite films was investigated. The localized surface plasmon resonance (LSPR) effect of the Ag nanoparticle/Ag-doped SiO2 composite films enhanced the fluorescence intensity of CdSe quantum dots (QDs). Scanning electron microscopy (SEM), UV-vis spectrophotometer and photoluminescence (PL) spectroscopy were used to characterize the morphology and optical properties of the composite nanostructure.