Multiple change in the electrical capacity of laser-induced graphene at varied synthesis modes

Laser-induced graphene (LIG) is a graphene-like highly porous electrically conductive film material synthesized by laser pyrolysis of a carbon-containing dielectric material. This paper reports on the findings regarding the influence of LIG synthesis modes on its electrical capacitance. Synthesis of LIG was carried out by line-by-line scanning of a cw CO$_2$ laser beam over the surface of polyimide film, and the electrical capacitance of the obtained samples was determined by potentiodynamic method using a two-electrode scheme in sulfuric acid solution. It was found that by decreasing the laser beam scanning speed and adjusting the laser power it is possible to increase the specific capacitance of LIG from 2.6 to 27 mF/cm$^2$.