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Fabrication of Ag@SiO 2 @Y 2 O 3 :Er Nanostructures for Bioimaging: Tuning of the Upconversion Fluorescence with Silver Nanoparticles

2010; American Chemical Society; Volume: 132; Issue: 9 Linguagem: Inglês

10.1021/ja909108x

1943-2984

Fan Zhang, Gary B. Braun, Yifeng Shi, Yichi Zhang, Xiaohong Sun, Norbert O. Reich, Dongyuan Zhao, Galen D. Stucky,

Quantum Dots Synthesis And Properties

We demonstrated that the nanostructures comprising silver cores and dense layers of Y2O3:Er separated by a silica shell are an excellent model system to study the interaction between upconversion materials and metals in nanoscale. This architecture allows for versatile control of the Y2O3:Er−metal interaction through control of the silica dielectric spacer thickness and the metal-core size. Finally, the nanoparticles are potentially interesting as fluorescent labels in, for instance (single particle), imaging experiments or bioassays which require low background or tissue penetrating wavelengths.