Flexible in-plane Micro-Supercapacitor Prepared by Laser Annealing and Ablation of a Graphene/Polyamide Acid Composite

• Published in: Journal of Photopolymer Science and Technology Vol. 35; no. 2; pp. 143 - 146
• Main Authors: Watanabe, Akira, Rahman, Ashiqur, Cai, Jinguang, Akhtaruzzaman, Md
• Format: Journal Article
• Language: English
• Published: Hiratsuka The Society of Photopolymer Science and Technology(SPST) 16.12.2022; Japan Science and Technology Agency
• Subjects: Activated carbon; Capacitance; Diffusion layers; Electrodes; Flexible electronics; Graphene; In-plane micro-supercapacitor; Ion diffusion; Laser ablation; Laser annealing; Laser beam annealing; Laser direct writing; Multilayers; Polyamide resins; Supercapacitors
• ISSN: 0914-9244; 1349-6336
• DOI: 10.2494/photopolymer.35.143

An in-plane micro-supercapacitor (MSC) which has a unique interdigitated electrode structure with through-holes was developed by laser annealing and ablation of a carbon/polyamide acid composite coating on a polyimide film. The laser annealing of a composite film consisting of multi-layer graphene or activated carbon remarkably lowered the resistivity by laser carbonization of polyamide acid. The laser ablation was conducted to make an interdigitated electrode with a through-hole structure. The through-holes were effective to improve the capacitance of an in-plane MSC by enhancing the ion diffusion in carbon layer because the surface area of carbon layer can be increased using front and back sides of a polyimide film. An in-plane MSC consisting of an asymmetric interdigitated electrode which had an activated carbon composite layer on the front side and a multi-layer graphene composite on back side of a polyimide film showed the improvement of capacitance.