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Preparation of a Novel Core–Shell Ag-Graphene@SiO2 Nanocomposite for Fluorescence Enhancement

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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.

Keywords: FLUORESCEIN ISOTHIOCYANATE; GRAPHENE; METAL ENHANCED FLUORESCENCE; MICROEMULSION METHOD; SILVER

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jbn.2012.1394

Publication date: June 1, 2012

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  • Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.
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