Laser-induced porous graphene films from commercial polymers.
basic_science · Level V
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- Record sourced from PubMed, PMID 25493446.
- Also identified by DOI 10.1038/ncomms6714 and PMC identifier 4264682.
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Abstract
The cost effective synthesis and patterning of carbon nanomaterials is a challenge in electronic and energy storage devices. Here we report a one-step, scalable approach for producing and patterning porous graphene films with three-dimensional networks from commercial polymer films using a CO<sub>2</sub> infrared laser. The sp<sup>3</sup>-carbon atoms are photothermally converted to sp<sup>2</sup>-carbon atoms by pulsed laser irradiation. The resulting laser-induced graphene (LIG) exhibits high electrical conductivity. The LIG can be readily patterned to interdigitated electrodes for in-plane microsupercapacitors with specific capacitances of >4 mF cm<sup>-2</sup> and power densities of ~9 mW cm<sup>-2</sup>. Theoretical calculations partially suggest that enhanced capacitance may result from LIG's unusual ultra-polycrystalline lattice of pentagon-heptagon structures. Combined with the advantage of one-step processing of LIG in air from commercial polymer sheets, which would allow the employment of a roll-to-roll manufacturing process, this technique provides a rapid route to polymer-written electronic and energy storage devices.