3D Plasmonic Ensembles of Graphene Oxide and Nobel Metal Nanoparticles with Ultrahigh SERS Activity and Sensitivity

Figure 3

(a) Scheme illustrating the self-assembly of graphene oxide (GO) and gold nanorods (GNRs). CTAB-capped GNRs and GO sheets display positive and negative charge, respectively. (b) Photographs of GO/GNRs aqueous solutions with different mass ratio. Blue box: a lot of aggregates in the solutions. Red box: no aggregates in the solutions. (c) TEM image of GO/GNRs at the mass ratio of 1 : 2 (Inset: GO-GNRs-GO sandwich). (d) TEM image of GO/GNRs at the mass ratio of 1 : 10 (Inset: GNRs-GO-GNRs sandwich).

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