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Graphene/NI as SERS sensors. Schematic diagram of the deposition of free-floating gold nanoislands/graphene SERS substrate onto the tip of the optical fiber (a). Scanning electron micrograph of graphene/AuNI SERS substrate on the tip of the optical fiber (gold is false-colored) (b). Scale bars: 150 μm, 2 μm in the left inset, 500 nm in the right inset. Raman spectra of 1-butanethiolate from graphene/AuNI-coated optical fibers (red) and unstructured 100 nm thick gold film (black) (c).
