Optical Studies of Fluorescent Mesoporous Silica Nanoparticles

摘要

Spherically shaped mesoporous silica nanoparticles(MSNs) having honeycomb like porous structure were synthesized by sol—gel method.Transmission electron microscopy(TEM),surface area measurement and X-ray diffractometry were used,revealing the hexagonal shaped pores in MSNs.MSNs with surface area of 1104.47 m^2/g and large porosity of 2.8 nm in pore diameter and 0.87 cm^3/g in pore volume were synthesized.TEM images showed spherical nanoparticles of ~ 200—300 nm having honeycomb like pores.Stilbene 420 laser dye was incorporated in MSNs and photoluminescence spectra of stilbene 420 in MSNs and in ethanol had been studied.Stilbene 420 laser dye showed high fluorescence intensity in the fluorescence spectra of MSNs than that of ethanol.The prolonged fluorescence lifetime decay of stilbene in MSNs and the increase in fluorescence intensity for stilbene 420 in MSNs would make these nanomaterials more useful for nanosensors and nanolasers application.