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Tuning surface-enhanced Raman scattering from graphene substrates using the electric field effect and chemical doping
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic and optical image of the GFET device. The dashed line indicates the raster scan direction, while back gate voltage, Vbg, is scanned from 50 V to −50 V. Raman signals of methylene blue (MB) are obtained throughout the scanning process. (b) The resistance of graphene at various gate voltages before/after coating MB molecules. The scan direction is indicated by arrows.

Image of FIG. 2.
FIG. 2.

(a) Raman spectra of MB molecules on graphene at two gate voltages, 50 V and −50 V. A Raman spectrum of MB on SiO2 surface (no graphene) is included as a reference. Enhancement from graphene is evident. (b) Intensities of the 1621 cm−1 Raman peak of MB at various gate voltages. Error bar of one standard deviation is included in the plot. The laser excitation is ∼0.2 mW/μm2 and 20 s integration. †: peak from Si. *: G-band of graphene.

Image of FIG. 3.
FIG. 3.

(a) Raman spectra of hole-doped, electron-doped, and normal graphene. Insets are stack plots to show the shifts. The laser excitation is 514 nm at ∼2 mW/μm2 and 1 s integration. (b) Raman intensity of MB molecules on the hole-doped, normal and electron-doped graphene with 647 nm excitation. The spectra are normalized according to the 520 cm−1 Si Raman peak (labeled by †) among different substrates. G-band from graphene is labeled by *.

Image of FIG. 4.
FIG. 4.

(a) The combined results from Fig. 2(b) and Fig. 3(b) : plot of the SERS enhancement from the intensities of MB at 1621 cm−1 for different doping levels of graphene. SERS enhancement is normalized to undoped graphene value. The red and blue lines serve as a visual guide.

Image of FIG. 5.
FIG. 5.

Plot of the normalized SERS enhancement at 1621 cm−1 of MB as a function of the change in electron density in the graphene with respect to normal graphene. The enhancement is normalized to the undoped graphene value. The line serves as a visual guide.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning surface-enhanced Raman scattering from graphene substrates using the electric field effect and chemical doping