Β‐Methylumbelliferone Surface Modification and Permeability Investigations at PENTEL™ Graphite Electrodes. Issue 5 (9th January 2020)

• Record Type: Journal Article
• Authors: Warren, Susan; Seddon, Brian; Pilkington, Ruth; Crossely, Alison; Holdway, Philip; Dempsey, Eithne
• Is Part Of: Electroanalysis. Volume 32:Issue 5(2020)
• Page Start: 1034
• Page End: 1042
• Publication Date: 2020-01-09
• Subjects: β-methyl-umbelliferone -- graphite pencil electrode -- selective polymer layer; Electrochemical analysis -- Periodicals; Chemistry, Analytical -- Periodicals; Electrochemistry -- Periodicals; 543.4
• DOI: 10.1002/elan.201900184
• Languages: English
• ISSNs: 1040-0397

Abstract

Abstract: 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. Abstract : Electro‐oxidation of β‐methylumbelliferone at a graphite‐composite material is examined electrochemically and via surface interrogation. Molecular redox probes are used for surface permeability studies together with Pt depositon for surface profiling.