Analysis of catechol, 4-methylcatechol and dopamine electrochemical reactions on different substrate materials and pH conditions
No Thumbnail Available
Access rights
openAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2018-12-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
309-321
309-321
Series
Electrochimica Acta, Volume 292
Abstract
The electrochemical behavior of several structurally related catecholamine molecules has been investigated on different electrode materials with cyclic voltammetry, infrared spectroscopy and scanning tunnelling microscopy. Emphasis was on the identification of subsequent chemical processes that follow the main electron transfer step and complicate the interpretation of the mechanism, including the polymerization reaction and fouling of the electrode surface. Among the materials investigated, gold was found out to be the most active for the oxidation of catechol, 4-methylcatechol and dopamine. At the same time, it was also the electrode least sensitive to fouling after voltammetric cycling, exhibiting the highest reversibility. The effect of pH was also investigated. Increase in pH enhanced the processes of quinone hydroxylation and polymerization. Spectroscopic measurements allowed detection of both solution and adsorbed species participating in the oxidation and polymerization processes. Finally, STM results showed the formation of polydopamine granules on gold surfaces, which grew in size as the number of cycles increased. Measured height of the granules, less than 0.5 nm, suggests a flat orientation of the molecules conforming the polymer.Description
Keywords
Catecholamines, Cyclic voltammetry, Dopamine, In situ infrared spectroscopy, Scanning tunnelling microscopy
Other note
Citation
Chumillas, S, Palomäki, T, Zhang, M, Laurila, T, Climent, V & Feliu, J M 2018, ' Analysis of catechol, 4-methylcatechol and dopamine electrochemical reactions on different substrate materials and pH conditions ', Electrochimica Acta, vol. 292, pp. 309-321 . https://doi.org/10.1016/j.electacta.2018.08.113