Flexible graphene films were prepared by the filtration of water-soluble noncovalently functionalized graphene sheets with pyrenebutyrate. The work presented here will not only open a new way for preparing water-soluble graphene dispersions but also provide a general route for fabricating conducting films based on graphene.

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3D Fe3O4-graphene nanocomposites were conveniently prepared via a direct hydrothermal grafting method. On the basis of the unique properties of both single-crystalline Fe3O4 and 3D chemically reduced graphene oxide, with characteristics such as ultralow density and high surface area, the as-prepared graphene-Fe3O4 nanocomposites showed high-performance microwave absorption ability and have the potential for application as advanced microwave absorbers.

Three-dimensional dendritic gold nanostructures (3D-DGNs) were prepared at room temperature through an aqueous/organic interfacial reaction of hydrogen tetrachloroaurate (HAuCl 4 , in aqueous phase) and 3,4-ethylenedioxythiophene (EDOT, in organic phase) without the use of any seeds, templates, surfactants, or stabilizers. SEM and TEM studies indicated that the 3D-DGNs compose of numerous nanowires with diameters around 30 nm and each wire brings a nanosheet head with thickness of 80 ( 5 nm. The effects of reaction conditions including the concentrations of HAuCl 4 and EDOT, the reaction temperature, and the organic solvents on the morphology of 3D-DGNs were systematically investigated and a possible mechanism for the formation of 3D-DGNs was proposed. The 3D-DGNs can be used as substrates for surface-enhanced Raman scattering (SERS). They exhibited much higher surface enhancement than those of conventional electrochemically roughed gold surfaces and gold nanorods when 4-mercaptopyridine (4MP) was used as a molecule probe. The enhancement factor of 3D-DGN substrate was measured to be (1.9 ( 0.4) × 10 6 , and the limit of detection (LOD) was determined to be lower than 1 × 10 -10 M.

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