Journal
NANOTECHNOLOGY
Volume 31, Issue 32, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab8d67
Keywords
laser-reduced graphene oxide; flexible electrode; graphene electrode; laser fabrication
Funding
- Spanish Ministry of Economy, Industry and Competitiveness [ENE2017-89210-C2-1-R]
- AGAUR of Generalitat de Catalunya [2017 SGR 1086, 2017 SGR 1771]
- Spanish Ministry of Economy and Competitiveness, through the 'Severo Ochoa' Programme for Centres of Excellence in RD [SEV-2015-0496]
- Romanian Ministry of Research and Innovation, CCCDI-UEFISCDI, within PNCDI III [PN-III-P1-1.2-PCCDI-2017-0350/01.03.2018]
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The fabrication of bendable electronic devices is a scientific-technological area of very rapid advance in which new materials and fabrication techniques are being continuously developed. In these kinds of devices, the fabrication of flexible conductive electrodes adherent to the substrate is a key factor. Further, eco-friendliness, low cost and fast production are essential requirements for the successful progress of new technologies. In this work, a novel method for obtaining graphene-based flexible electrodes is presented. Conductive films were obtained by means of the visible laser irradiation of graphene oxide layers deposited on polyethylene terephthalate substrates and self-standing membranes sandwiched between glass slides. Despite the low power of the laser system, the numerical simulations indicate the development of temperatures over 1000 K throughout the irradiated material. The laser-induced spatially confined heating leads to the reduction of the graphene oxide material, whereas the glass-based sandwich assembly avoids reoxidation from the surrounding air. By scanning and pixelated modes, reduced graphene oxide electrodes, up to 100 mu m in thickness, and with a resistivity as low as 6 x 10(-4) omega m, were obtained in an easy and versatile way. Proof-of-concept microsupercapacitors and electrochemical sensors were fabricated with this technique, showing promising performance.
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