Département de chimie moléculaire

An efficient and easy way of designing free standing redox buckypaper electrodes via the elegant combination of multi-walled carbon nanotubes (MWCNTs) and a bis-pyrene deriv. is reported. This bis-pyrene 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (bis-Pyr-ABTS) acts as a cross-linker between the nanotubes and assures the formation of a mech. reinforced buckypaper, obtained by a classical filtration technique of a MWCNT suspension in the presence of bis-Pyr-ABTS. In addn., the ABTS deriv. assures a mediated electron transfer to laccase. The electroactive buckypapers were characterized in terms of morphol., cond., and electrochem. properties. Two setups were evaluated. The first consisted of the immobilization and wiring of laccase enzymes via an inclusion complex formation between the hydrophobic cavity of laccase and the pyrene groups of bis-Pyr-ABTS that are not $π$-stacked to the nanotubes. The second approach was to evaluate the mediated electron transfer using laccase in soln. For this setup, the developed mediator electrodes demonstrated high performances with max. currents up to 2 mA ± 70 $μ$A and an excellent operational stability for two weeks with daily one hour discharges using refreshed laccase solns. [on SciFinder(R)]