Influence of the laser irradiation on the electrochemical and spectroscopic peculiarities of graphene-chitosan composite film

Activation of the chitosan-modified graphene cast on indium-tin-oxide electrodes was performed with laser irradiation. The composite electrodes were characterised spectroscopically and electrochemically applying Fourier transform infrared and Raman spectroscopies, cyclic voltammetry and electrochemical impedance spectroscopy, respectively. Significant rise in the double-layer capacitance was obtained after the laser irradiation of the modified graphene film formed from its dispersion in chitosan solution. Effect of the laser irradiation depended on a load of the modified graphene in the film. The laser treatment improved electrochemical properties of the electrodes made of the modified chitosan-graphene-film due to creation of edge defects and formation of nanocrystalline structures from graphene flakes.