Alicia de Andras: Oxidation of Copper Covered by Graphene: the relevance of copper morphology and crystalline structure

posted 27 May 2019, 12:09 by info admin
Instituto de Ciencia de Materiales de Madrid - CSIC, Cantoblanco 28049 Madrid, Spain. 

Graphene is an impermeable membrane to gases, however, copper foils used to catalyze 
graphene synthesis by CVD are more heavily oxidized in the mid and long term than graphene free copper. Oxidation rate depends strongly on copper morphology, such as the presence and density of grain boundaries, and on the crystalline orientation of the surface. Totally different oxidation rates are found in single crystalline bulk or thin film copper (slow rates) than in polycrystalline foils (high rates) where, additionally, oxidation is highly inhomogeneous [1]. The observed difference in oxidation rates for the different surfaces is drastically enhanced compared to graphene free copper.  In fact, in some conditions, it is possible to obtain very stable copper surfaces as, for example, in copper mesogrids covered by graphene [2].  Different facets of this complex subject will be presented and discussed, as the modification of copper surface and grain orientation achieved during graphene growth, the several mechanisms involved in oxidation or the observed anomalous G and 2D frequencies behavior in oxidation resistant surfaces [1,3].   

1. L. Alvarez-Fraga, J. Rubio-Zuazo, F. Jiménez-Villacorta, E. Climent-Pascual, R. Ramirez, C. Prieto, A. de Andrés. Chem. Mater. 29, 3257−3264 (2017)
2. L. Álvarez-Fraga, J. Bartolomé, M. Aguilar-Pujol, R. Ramírez, C. Prieto, A. de Andrés. Appl. Surf. Sci. (Revised versión, 2019)
3. J. Bartolomé, L. Álvarez-Fraga, M. Aguilar-Pujol, S. Cortijo, A. Cremades, C. Prieto, A. de Andrés. 2D Materials 6, 015023 (2019)

Prof. Alicia de Andrés received her PhD in Physics from the Autonomous University of Madrid and did postdoctoral trainings at the Laboratoire pour l’Ultisation du Rayonment Electromagnétique (LURE, Université Paris Sud) and at the Technische Universität in Berlin. Since 2008, she is Research Professor at the Materials Science Institute in Madrid – Spanish Council for Scientific Research (ICMM - CSIC).  Leader of the Graphene based hybrid materials group and head of the Optical Spectroscopies Laboratory. Her research over the past 15 years has focused on the development and study of materials with applications in spintronics and optoelectronics. At present her interests are mainly focused in developing i) graphene and 2D-TMDs based materials for applications in optical sensing and imaging and ii) materials for lighting and photovoltaics based on rare earth doped nanoparticles and metal organic frameworks as well as metal-organic perovskites.