Abstract

A facile one-pot water-in-oil microemulsion method has been developed for the synthesis of a novel core-shell Ag-graphene@SiO2 nanocomposite with fluorescein isothiocyanate (FITC) doped in the shell. During the preparation process, reducing both Ag+ and graphene oxide, and loading of Ag nanoparticles on graphene were occurred in the microemulsion simultaneously. Then FITC was covalently doped in the silica shell through a copolymerization reaction with tetraethoxysilane (TEOS). The morphology and optical properties of the nanocomposite were characterized by transmission electron microscope (TEM), UV-Vis spectrum, fluorescence emission spectrum and FT-IR spectrum, respectively. The results showed that the emission intensity from the as-prepared nanocomposite was 3-fold higher than that of control silica nanoparticles in which graphene was absent. The graphene in the as-prepared nanocomposite exhibited an enhanced effect for the metal enhanced fluorescence (MEF). This enhancement offers a potential increase in overall nanoprobe detectability. This work could provide new insights into fabrication of Ag-graphene based nanocomposites and facilitate their application.

Links

Publisher Full Text

Authors

Yin D, Liu B, Zhang L, Wu M

Institution

College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.

Source

Journal of biomedical nanotechnology 8:3 2012 Jun pg 458-64

MeSH

Fluorescein-5-isothiocyanate
Fluorescent Dyes
Graphite
Materials Testing
Nanostructures
Particle Size
Porosity
Silicon Dioxide
Silver
Surface Properties

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22764415