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Far-infrared study of substrate-effect on large scale graphene
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Image of FIG. 1.
FIG. 1.

of in FIR region. represents the transmission of the graphene sample relative to that of substrate. The dashed curve shows the fit result using Drude model. The dip at is an artifact due to low instrumental FIR intensity. The inset shows absolute transmission of the and Si (0.5mm) without graphene. We determine of Si and from their transmission levels. See the dashed lines. The dip at is due to optical phonon of (Si).

Image of FIG. 2.
FIG. 2.

of graphene transferred on with polar oxide buffer and ZnO. The dashed curves show the fit from the multilayer optical transmission analysis. Inset shows the absolute transmission of the insulating composite substrates. of the buffer-layer is determined from the transmission level at low frequency region.

Image of FIG. 3.
FIG. 3.

of graphene on with organic polymer buffer PMMA and HMDS. Inset shows the carrier density (n) and scattering rate as function of for the different buffer-layers.


Generic image for table
Table I.

Drude model fit result for different buffer-layers: plasma frequency , scattering rate , carrier density N, and mobility . d and are the thickness and dielectric constant, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Far-infrared study of substrate-effect on large scale graphene