Interaction of oxidized multi-wall carbon nanotubes with coronen on graphite electrodes: electrochemical examination

The possibilities of activation of carbon electrodes by oxidized multi-walled carbon nanotubes and hybrid nanomaterials based on carbon nanotubes and coronen, which can be considered as an elementary fragment of graphene, have been investigated. The electrochemical properties of the modified electrodes were studied by the cyclic voltammetry method on the example of slate-pencil graphite electrodes and carbon electrodes obtained by screen printing. It is shown that modification of the electrode surface with carbon nanotubes repeatedly increases the efficiency of electrochemical processes in both systems, which indicates the prospects for the use of graphite slates-pencils in electroanalysis and for the creation of bioelectrodes. However, contrary to expectations, the adsorption of coronen on oxidized multi-walled carbon nanotubes reduces the observed effect. A diagram of the proposed interaction of nanotubes and coronen is given, that explains the results obtained. Simulation of the processes of electrocatalytic oxidation-reduction of methylene blue on modified electrodes confirms the proposed diagram of interaction of oxidized carbon nanotubes and coronen.