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Making graphene visible

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arxiv 0705.0259 v3 pith:VYFN75IS submitted 2007-05-02 cond-mat.mes-hall cond-mat.other

Making graphene visible

P. Blake , K. S. Novoselov , A. H. Castro Neto , D. Jiang , R. Yang , T. J. Booth , A. K. Geim , E. W. Hill This is my paper
classification cond-mat.mes-hall cond-mat.other
keywords graphenesilicondioxidethicknessexperimentalalbeitapproxcertain
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Microfabrication of graphene devices used in many experimental studies currently relies on the fact that graphene crystallites can be visualized using optical microscopy if prepared on top of silicon wafers with a certain thickness of silicon dioxide. We study graphene's visibility and show that it depends strongly on both thickness of silicon dioxide and light wavelength. We have found that by using monochromatic illumination, graphene can be isolated for any silicon dioxide thickness, albeit 300 nm (the current standard) and, especially, approx. 100 nm are most suitable for its visual detection. By using a Fresnel-law-based model, we quantitatively describe the experimental data without any fitting parameters.

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