title: Preparation of a novel core-shell Ag-graphene@SiO2 nanocomposite for fluorescence enhancement.
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.
authors: College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
authors: Dongguang
authors: D
authors: Yin
authors: Binhu
authors: B
authors: Liu
authors: Le
authors: L
authors: Zhang
authors: Minghong
authors: M
authors: Wu
mesh_terms: D016650:Fluorescein-5-isothiocyanate / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis*; D006108:Graphite / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005456:Fluorescent Dyes; D012834:Silver; D012822:Silicon Dioxide; D006108:Graphite; D016650:Fluorescein-5-isothiocyanate