Electronic Hybridization of Large-Area Stacked Graphene Films

• DOI: 10.1021/nn304834p
• Publication Date: 2012-12-14T21:17:03Z
• Authors: Jeremy T. Robinson; Scott W. Schmucker; C. Bogdan Diaconescu; James P. Long; James C. Culbertson; Taisuke Ohta; Adam L. Friedman; Thomas E. Beechem
• Keywords: Bilayer graphene

Direct, tunable coupling between individually assembled graphene layers is a next step towards designer two-dimensional (2D) crystal systems, with relevance for fundamental studies and technological applications. Here we describe the fabrication characterization of large-area (> cm^2), coupled bilayer on SiO2/Si substrates. Stacking two films leads to direct electronic interactions layers, where resulting film properties are determined by local twist angle. Polycrystalline have "stained-glass window" appearance explained emergence narrow absorption band in visible spectrum that depends Direct measurement layer orientation via electron diffraction, together Raman optical spectroscopy, confirms persistence clean interfaces over large areas. Finally, demonstrate interlayer can be reversibly turned off through chemical modification, enabling optical-based detection schemes. Together, these results suggest individual 2D crystals form electronically systems suitable large-scale