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β‐Methylumbelliferone Surface Modification and Permeability Investigations at PENTEL ™ Graphite Electrodes
Author(s) -
Warren Susan,
Seddon Brian,
Pilkington Ruth,
Crossely Alison,
Holdway Philip,
Dempsey Eithne
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900184
Subject(s) - umbelliferone , graphite , surface modification , electrode , fluorescence , chemistry , adsorption , electrochemistry , chemical engineering , analytical chemistry (journal) , materials science , chromatography , organic chemistry , optics , coumarin , physics , engineering
Electrochemical and micro‐imaging analysis of a commercial graphite‐composite material is presented following electro‐oxidation with β‐methylumbelliferone. Charge‐transfer surface modification was observed for the graphite electrode, presumed to have arisen from adsorbed interfacial umbelliferone moieties. The molecular permeability of the new surface towards a range of similar, yet size‐variable (23 Å 3 –136 Å 3 ) molecular redox probes is discussed. Red‐shift fluorescence in confocal microscopy offers further support for the presence of a surface‐bound umbelliferone layer. An SEM‐platinum profiling technique was used as an imaging tool to map the umbelliferone surface and size‐distribution of electro‐active sites.