Formation and stability of highly conductive semitransparent copper Meso-grids covered with graphene



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Álvarez Fraga, Leo and Bartolomé Vílchez, Javier and Aguilar Pujol, Montserrat X. and Ramírez Jiménez, Rafael and Prieto, Carlos and Alicia de, Andrés (2019) Formation and stability of highly conductive semitransparent copper Meso-grids covered with graphene. Applied surface science, 493 . pp. 32-40. ISSN 0169-4332

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We report on the formation of highly stable and robust hybrid semitransparent electrodes based on a percolated mesoscale copper grid covered with graphene. Copper films sputtered on transparent substrates are used to synthesize graphene by CVD and annealed to form metallic grids covered with graphene. The copper grid density can be controlled by varying annealing temperature and time, obtaining excellent sheet resistance ( < 0.7 Omega/sq). The single layer graphene that covers the whole sample modifies the preferred crystalline orientation favoring (110) copper grains when treated up to 1050 degrees C. However, when annealed few degrees below bulk copper melting temperature, graphene is partially eliminated, probably due to the high pressure of copper vapor generated underneath, and copper forms isolated dots with mainly (111) orientation. During graphene synthesis, similar to 70% of the copper film is evaporated but, once graphene layer is completed the remaining copper fraction is constant up to almost bulk copper melting temperature demonstrating that graphene is an excellent barrier against copper evaporation. Contrary to the enhanced oxidation of copper foils with graphene, these graphene-Cu grids are extremely stable in ambient conditions maintaining an almost unchanged performance for years. The copper based meso-grids are highly stable and robust and present a suitable surface for organic- and biomolecules provided by the continuous graphene layer.

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©2019 Elsevier
The research leading to these results has received funding from MINECO (MAT2015-65356-C3-1-R) and Comunidad de Madrid (S2013/MIT-2740, PHAMA2.0-CM). We also acknowledge the MINECO for financial support and provision of synchrotron radiation facilities at BM25 SpLine, the Spanish CRG, and Juan Rubio-Zuazo for technical support.

Uncontrolled Keywords:Transparent electrode; Metal; Diffraction; Nanowires; Copper grids; Graphene; Oxidation; Grain orientation; Electrode; Stability
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:59197
Deposited On:20 Feb 2020 12:45
Last Modified:01 Nov 2021 23:00

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