Abstract
We report a systematic investigation of the colour contrast (CC)of graphene (one, two and three layers) on 50, 72 and 80 nm thickAl2O3/Si(100) and 100 and300 nm thick SiO2/Si(100). The CC is determined by the analysis of optical microscopy images taken under whitelight illumination. A corresponding assignment of graphene in the single-layer, double-layerand trilayer phases is made using micro-Raman spectroscopy. A quantitative evaluationallows us to conclude that the colour contrast between 72 nm alumina and graphene issignificantly larger than that between 300 nm silicon oxide and graphene (by factors of 2.2,2.0 and 3.3 for the single-layer, double-layer and trilayer graphene flakes respectively).Moreover, data indicate that, to increase visibility, the use of a red or a green light ispreferable.
Published Version
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