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Transfer printing process of graphene on a metal surface.
(a) Raman spectra of as grown graphene on copper (green) and transfer printed graphene on silver (blue) and gold (red) surface. The intensity of the defect mode (D) is negligibly small. (b) Transmission spectra of multilayer graphene on transparent quartz substrates. Each layer has around 2% optical absorption. (c) Schematic representation of the Kretschmann configuration used to excite surface plasmon-polariton on graphene-gold surface. (d) Surface plasmon resonance curves for gold surface before (red) and after (blue) transfer printing graphene. The wavelength of the incident light is 632 nm. The presence of the graphene introduces 1° shift in the resonance angle.
(a) TM-polarized reflectivity maps of multilayer graphene on a silver surface. (b) Overlaid reflection spectra of multilayer graphene-silver surface at constant angle (42°). (c) The resonance wavelength and the FWHM of SPP on graphene-silver surface as a function of layer number. (d) Calculated dispersion relations of SPP on silver surface using Drude model (red curve) and frequency dependent dielectric constant (blue curve). The dispersion relation of graphene coated surface is shown with black line. The inset shows the magnified dispersion relation of silver surface coated with multilayer graphene. The green line is the dispersion relation of light in free space.
Overlaid binding interaction plot for BSA for concentration from 40 nM to 500 nM interacting with graphene layer. The inset shows the calculated time constant of the exponential saturation curves. The slope of the curve provides association constant ka of 2.4 × 10−5 M−1 s−1.
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