Study on Preparation of Ag - SiO2 Nanocomposite Material Enhancing Fluorescence for Rhodamine 6G

Ag - SiO2 nanocomposite material was synthesized by the Stöber method and reduction process. SEM images showed that SiO2 in the form of a nanosphere, and an average particle size of 165 nm, and Ag nanoparticles possess an average particle size of 17 nm, distributed quite evenly on the surface of SiO2 nanospheres. The UV - Vis absorption spectrum of Ag - SiO2 material presents a broad band at 400 nm attributed to plasmon surface resonance of Ag nanoparticles. Mixing up solutions of Ag - SiO2 and R6G, a fluorescence band of Rhodamine 6G (R6G) at 570 nm increased 86 times compared with that of only R6G. The as-prepared Ag - SiO2 nanocomposite material also increased the fluorescence intensity of R6G with concentration varying from 0.1 to 100 ppm.