RT Journal Article
T1 Grain selective Cu oxidation and anomalous shift of graphene 2D Raman peak in the graphene-Cu system
A1 Bartolomé Vílchez, Javier
A1 Cremades Rodríguez, Ana Isabel
A1 Álvarez Fraga, Leo
A1 Aguilar Pujol, Montserrat X.
A1 Cortijo Campos, Sandra
A1 Prieto de Castro, Carlos
A1 Andrés Miguel, Alicia de
AB 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.
PB IOP Publishing
SN 2053-1583
YR 2019
FD 2019-01
LK https://hdl.handle.net/20.500.14352/13000
UL https://hdl.handle.net/20.500.14352/13000
LA eng
NO © 2019 IOP PublishingFunding 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.
NO Ministerio de Economia y Competitividad (MINECO)
NO FPI from MINECO
NO Comunidad de Madrid
DS Docta Complutense
RD 28 abr 2024