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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:18 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Physics and Technology of Renewable and Alternative Energy Sources
Title:
Morphic transitions of graphene under laser induction: from honeycombs to nanowires and the role of precursors
Authors:
A. TILIAKOS, C. CEAUS, A. CUCU, S.M. IORDACHE, A.M.I. TREFILOV, I. STAMATIN
Affiliation:
University of Bucharest, Faculty of Physics, 3Nano-SAE Research Center,
405 Atomistilor Str, Bucharest-Magurele, Ilfov, Romania, 077125
E-mail
thanasis_tiliakos@hotmail.com
Keywords:
Graphene, laser induction, laser reduction, structural transition, supercapacitor
Abstract:
Carbon-based solid-state supercapacitors have a long history that has seen the employment of various forms of carbon as electrode materials. Starting from porous activated carbon, current research efforts have shifted towards exploiting the properties of graphene to initiate a new chapter in supercapacitor technology. One of the latest trends has seen the use of lasers to inscribe electrode designs directly onto carbon-based substrates by reducing the starting material to multi-layered porous graphene. Initial implementations have employed self-standing graphene oxide (GO) thin films and industrial laser cutters (CNCs); later implementations have succeeded in utilizing affordable commercial technology (LightScribe drives) to reduce graphene oxide films deposited on specialized media (LightScribe DVDs). The latest advances have abandoned graphene oxide as a precursor –thus avoiding the time and cost for the production of the material- in favor of polyimide (PI) films, which are laser-induced into porous graphene sponges via laser CNCs. In this research, we employ both materials to manufacture graphene electrodes for comparing dual-plane supercapacitor implementations. Finally, we analyze the effect of laser operating parameters (power level, scan rate, printing resolution, pitch size, and perpendicular displacement) on the structure and stability of the laser-induced graphene. We determine the optimal windows of laser operating parameters for the induction method, and we observe the morphic transitions of graphene, from honeycomb lattices to amorphous carbon and nanowires, over a range of laser parameters.
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