Thickness-Dependent Morphologies of Gold on N-Layer Graphenes

摘要

Since their discovery in 2004,n1nn-layer graphenes havenattracted intense interest due to their unique structure; interesting,nnovel properties;n2,3nand significant dependence of properties onnthe layer number “n”.n4,5nFor example, in monolayer and bilayerngraphene, the carriers correspond to massless and massive Diracnfermions and the quantum hall effect occurs at different fillingnfactors, respectively.n4,5nIn this work we report that gold depositednby thermal evaporation on graphenes interact differently withnthese substrates depending on the layer number of graphenes.nThis results in different morphologies of gold film on graphenesnwith different layer numbers. The differences observed with SEMn(scanning electron microscopy) can be used to identify andndistinguish graphenes especially if they are mixed with differentnlayer numbers. Compared to the usual two methods reportednpreviously, this technique with SEM is more convenient, has anhigher throughput than that based on AFM (atomic forcenmicroscopy),n1nand has a higher spatial resolution than that basednon Raman spectroscopy.