Abstract
Covalently grafted Kolliphor®EL (a poly-ethylene-glycol based "transporter molecule" for hydrophobic water-insoluble drugs; MW ca. 2486; diameter ca. 3-5 nm) at the surface of a glassy carbon electrode strongly affects the rate of electron transfer for aqueous redox systems such as Fe(CN)63-/4-. XPS data confirm mono-layer grafting after electrochemical anodisation in pure Kolliphor®EL. Based on voltammetry and impedance measurements, the charge transfer process for the Fe(CN)63-/4- probe molecule is completely blocked after Kolliphor®EL grafting and in the absence of a "guest". However, in the presence of low concentrations of suitable ferrocene derivatives as "guests", mediated electron transfer across the mono-layer via a "shuttle mechanism" is observed. The resulting amplification of the ferrocene electroanalytical signal is investigated systematically and compared for 5 ferrocene derivatives. The low concentration electron shuttle efficiency decreases in the sequence dimethylaminomethyl-ferrocene > n-butyl-ferrocene > ferrocene-dimethanol > ferrocene-acetonitrile > ferrocene-acetic acid.
Original language | English |
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Pages (from-to) | 15458-15465 |
Journal | ACS Applied Materials and Interfaces |
Volume | 7 |
Issue number | 28 |
Early online date | 9 Jul 2015 |
DOIs | |
Publication status | Published - 22 Jul 2015 |
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Frank Marken
- Department of Chemistry - Professor
- Institute for Sustainable Energy and the Environment
- Centre for Sustainable Chemical Technologies (CSCT)
- Water Innovation and Research Centre (WIRC)
- Centre for Nanoscience and Nanotechnology
- IAAPS: Propulsion and Mobility
- Centre for Bioengineering & Biomedical Technologies (CBio)
- Institute of Sustainability and Climate Change
Person: Research & Teaching, Affiliate staff
Equipment
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High Performance Computing (HPC) Facility
Chapman, S. (Manager)
University of BathFacility/equipment: Facility