ИСТИНА

Laser-induced graphene (LIG) is a highly porous electrically conductive carbon material obtained by laser pyrolysis of a carbon-containing precursor. Due to its good electrical conductivity, it is a promising material for use in various fields of modern electronics, power engineering and medical instrumentation. In this work, we present the results of the study of LIG film samples synthesized on the surface of a polyimide film using a cw CO2-laser. We have found that in such films, the generation of nanosecond photocurrent pulses isobserved when their surface is irradiated with pulsed laser radiation of nanosecond duration. It has been established that the polarity of photocurrent pulses depends on the direction of the exciting radiation wave vector. It was also shown that the efficiency of photocurrent generation is affected by the synthesis conditions: power of the CO2-laser, the laser beam velocity, the distance between the lines and the direction of the laser beam movement across the surface of the polyimide film. The identified features of the photoreponse of LIG film structures allow them to be used as high-speed laser pulse energy meter, orientation sensors, tracking devices, and various angle-measuring devices. The report discusses these and other features of the discovered effect. The study was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation (N 1022040600237-3-1.3.2).