Preparation of composite PMMA microbeads hybridized with fluorescent YVO4:Bi3+,Eu3+ nanoparticles

Poly(methyl methacrylate) (PMMA) microbeads are hybridized with fluorescent YVO4:Bi3+,Eu3+ nanoparticles using the layer-by-layer adsorption technique. The composite beads A are prepared by adsorbing negatively-charged YVO4:Bi3+,Eu3+ nanoparticles onto positively-charged PMMA beads modified with poly(allylamine hydrochloride) (PAH). The composite beads B are prepared by adsorbing nanoparticles onto PMMA beads with multiple alternate layers of PAH and poly(sodium 4-styrenesulfonate) (PSS), i.e., with (PAH/PSS)4/PAH layers. The composite beads C are prepared by adsorbing 300 deg. C heated nanoparticles with negative charge onto PMMA beads with single PAH layer. These three kinds of composite beads are compared in terms of the amount of adsorbed nanoparticles and the fluorescent intensity.