✍ Scribed by Paweł Krysiński
No coin nor oath required. For personal study only.
Suitably modified mono-and bimolecular films, including bilayer lipid membranes (BLMs), o er exceptionally good opportunities for probing electric field effects on charge transfer and redox reactions in biosensor and molecular electronics research and development.
This work presents the redox reactions of tetracyano-p-quinodimethane (TCNQ) molecules incorporated in a self-assembled octadecanethiol monolayer (SAM) on polycrystalline gold electrodes, depending upon the type of supporting electrolyte cations and their concentration. Our results show that TCNQ-modified Au-SAM electrodes exhibit selectivity versus alkali metal cations in aqueous supporting electrolyte (10 kJ mol 21 difference between K 1 and Li 1 and between Cs 1 and K 1 ). The slope of the 'calibration curves' for Li 1 and K 1 is about 59 mV per decade of concentration of the analyte. The explanation of this behaviour is based on the Donnan potential model; however, an ionpairing effect can also be involved. Our preliminary results show also that the TCNQ molecules within the octadecanethiol monolayer may act as a molecular redox device. *
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