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Nanomaterials 2016, 6(9), 161;

Copper Micro-Labyrinth with Graphene Skin: New Transparent Flexible Electrodes with Ultimate Low Sheet Resistivity and Superior Stability

Department of Materials Science and Engineering and Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
Academic Editor: Ho Won Jang
Received: 15 July 2016 / Revised: 18 August 2016 / Accepted: 31 August 2016 / Published: 1 September 2016
(This article belongs to the Special Issue 2D Nanomaterials: Graphene and Beyond Graphene)
View Full-Text   |   Download PDF [2356 KB, uploaded 1 September 2016]   |  


We have developed self-assembled copper (Cu) micro-labyrinth (ML) with graphene skin for transparent flexible electrodes of optoelectronic devices. The Cu ML is simply formed by heating a thin Cu film with a 100-nm thickness on a SiO2/Si substrate at 950 °C under hydrogen ambient to block the oxidation. Moreover, the Cu ML can have graphene skin at the surface by inserting carbo-hydroxyl molecules (CxHy) during heating due to the catalytic decomposition of C–H bonds on the Cu surface. The Cu ML with graphene skin (Cu ML-G) has superior sheet resistivity below 5 Ω/sq and mechanical flexibility without cracks at the bending radius of 0.1 cm. Although the transmittance of Cu ML-G is a little lower (70%~80%) than that of conventional metallic nanowires electrodes (such as Ag, ~90% at the visible wavelength), it has good thermal stability in conductivity without any damage at 200 °C due to a micro-sized pattern and graphene skin which prohibits the surface migration of Cu atoms. View Full-Text
Keywords: Cu micro-labyrinth; transparent flexible electrode; graphene Cu micro-labyrinth; transparent flexible electrode; graphene

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yu, H.K. Copper Micro-Labyrinth with Graphene Skin: New Transparent Flexible Electrodes with Ultimate Low Sheet Resistivity and Superior Stability. Nanomaterials 2016, 6, 161.

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