Synthesis of quasi-free-standing bilayer graphene nanoribbons on SiC surfaces

Myriano H. Oliveira, Jr. (), Joao Marcelo J. Lopes (), Timo Schumann, Lauren A. Galves, Manfred Ramsteiner, Katja Berlin, Achim Trampert and Henning Riechert
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Myriano H. Oliveira, Jr.: Paul-Drude-Institut für Festkörperelektronik
Joao Marcelo J. Lopes: Paul-Drude-Institut für Festkörperelektronik
Timo Schumann: Paul-Drude-Institut für Festkörperelektronik
Lauren A. Galves: Paul-Drude-Institut für Festkörperelektronik
Manfred Ramsteiner: Paul-Drude-Institut für Festkörperelektronik
Katja Berlin: Paul-Drude-Institut für Festkörperelektronik
Achim Trampert: Paul-Drude-Institut für Festkörperelektronik
Henning Riechert: Paul-Drude-Institut für Festkörperelektronik

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Scaling graphene down to nanoribbons is a promising route for the implementation of this material into devices. Quantum confinement of charge carriers in such nanostructures, combined with the electric field-induced break of symmetry in AB-stacked bilayer graphene, leads to a band gap wider than that obtained solely by this symmetry breaking. Consequently, the possibility of fabricating AB-stacked bilayer graphene nanoribbons with high precision is very attractive for the purposes of applied and basic science. Here we show a method, which includes a straightforward air annealing, for the preparation of quasi-free-standing AB-bilayer nanoribbons with different widths on SiC(0001). Furthermore, the experiments reveal that the degree of disorder at the edges increases with the width, indicating that the narrower nanoribbons are more ordered in their edge termination. In general, the reported approach is a viable route towards the large-scale fabrication of bilayer graphene nanostructures with tailored dimensions and properties for specific applications.

Date: 2015
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DOI: 10.1038/ncomms8632

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