• Ruiz-Zepeda, Francisco
• Yakobson, Boris I.
• Tour, James M.
• Lin, Jian
• Yacaman, Miguel Jose
• Samuel, Errol L. G.
• Liu, Yuanyue
• Peng, Zhiwei

Abstract

<p>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 CO₂ infrared laser. The sp³-carbon atoms are photothermally converted to sp²-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 &gt;4 mF cm^-2 and power densities of ∼9 mW cm^-2. 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.</p>

Topics

• porous
• impedance spectroscopy
• polymer
• Carbon
• electrical conductivity