Journal
LANGMUIR
Volume 26, Issue 11, Pages 9088-9093Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la9047215
Keywords
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Funding
- Federal Ministry of Education and Research of Germany (BMBF) [BioHySys 0311993]
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Two new hydrophilic, poly(ethylene glycol) (PEG)-based redox copolymers bearing electrochemically active ferrocene (Fc) and thiol/disulfide anchoring functionalities were synthesized. These copolymers are shown to adsorb on gold surfaces causing polymeric self-assembled monolayers (pSAMs) that possess triple functions: redox-active, ionic-tunable, and bio-inert. Both immobilized polymers showed redox potentials at +400 mV (Ag|AgCl), and facilitate the electrocatalytical oxidation of NADH. Additionally, interfacial architecture of the polymers is affected by an increase in Ca2+ concentration, which leads to an amplification of the electrochemical response. The electrode current, measured for NADH-oxidation, increased by 80% after addition of 10 mM Ca2+ ions. Considering the Ca2+ influence on the heterogeneous electron transfer a structural model of the immobilized polymers is proposed based on the strong chelating abilitiy of noncyclic PEG moieties.
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