Grain selective Cu oxidation and anomalous shift of graphene 2D Raman peak in the graphene-Cu system



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Bartolomé Vílchez, Javier and Cremades Rodríguez, Ana Isabel and Álvarez Fraga, Leo and Aguilar Pujol, Montserrat X. and Cortijo Campos, Sandra and Prieto de Castro, Carlos and Andrés Miguel, Alicia de (2019) Grain selective Cu oxidation and anomalous shift of graphene 2D Raman peak in the graphene-Cu system. 2D Materials, 6 (1). ISSN 2053-1583

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Understanding the interaction between graphene and its supporting substrate is of paramount importance for the development of graphene based applications. In this work the interplay of the technologically relevant graphene-Cu system is investigated in detail as a function of substrate grain orientation in Cu polycrystalline foils. While (100) and (111) Cu grains show the well-known graphene-enhanced oxidation, (110) grains present a superior oxidation resistance compared to uncovered Cu and an anomalous shift of its graphene 2D Raman band which cannot be explained by the known effects of strain and doping. These results are interpreted in terms of a weak graphene-Cu coupling at the (110) grains, and show that graphene can actually be used as anticorrosion coating, contrary to previously reported. The anomalous shift is suggested to be the result of an enhanced outer Raman scattering process which surpasses the usually dominant inner process. Since Raman spectroscopy is widely used as first and main characterization tool of graphene, the existence of an anomalous shift on its 2D band not only challenges the current theory of Raman scattering in graphene, but also has profound implications from an experimental point of view.

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© 2019 IOP Publishing
Funding by the Spanish Ministerio de Economia y Competitividad (MINECO) under Project MAT2015-65356-C3-1-R and Comunidad de Madrid Excellence Network under Project S2013/MIT-2740 is acknowledged. LA-F and SC acknowledge FPI grants (BES-2013-062759 and BES-2016-076440 respectively) from MINECO.

Uncontrolled Keywords:Copper substrate; Growth; Spectroscopy; Orientation; Kinetics; Cu(110); Transition; Evolution; Spectrum; Crystal; Graphene; Raman spectroscopy; Copper oxidation; Strain; Graphene-substrate interaction
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:50709
Deposited On:17 Jan 2019 14:53
Last Modified:22 Jan 2020 12:36

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