Analysis of catechol, 4-methylcatechol and dopamine electrochemical reactions on different substrate materials and pH conditions

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Analysis of catechol, 4-methylcatechol and dopamine electrochemical reactions on different substrate materials and pH conditions. / Chumillas, Sara; Palomäki, Tommi; Zhang, Meng; Laurila, Tomi; Climent, Victor; Feliu, Juan M.

In: Electrochimica Acta, Vol. 292, 01.12.2018, p. 309-321.

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@article{b8e907ec67f94efd8ec0927d597eae2a,
title = "Analysis of catechol, 4-methylcatechol and dopamine electrochemical reactions on different substrate materials and pH conditions",
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.",
keywords = "Catecholamines, Cyclic voltammetry, Dopamine, In situ infrared spectroscopy, Scanning tunnelling microscopy",
author = "Sara Chumillas and Tommi Palom{\"a}ki and Meng Zhang and Tomi Laurila and Victor Climent and Feliu, {Juan M.}",
year = "2018",
month = "12",
day = "1",
doi = "10.1016/j.electacta.2018.08.113",
language = "English",
volume = "292",
pages = "309--321",
journal = "Electrochimica Acta",
issn = "0013-4686",

}

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TY - JOUR

T1 - Analysis of catechol, 4-methylcatechol and dopamine electrochemical reactions on different substrate materials and pH conditions

AU - Chumillas, Sara

AU - Palomäki, Tommi

AU - Zhang, Meng

AU - Laurila, Tomi

AU - Climent, Victor

AU - Feliu, Juan M.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - 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.

AB - 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.

KW - Catecholamines

KW - Cyclic voltammetry

KW - Dopamine

KW - In situ infrared spectroscopy

KW - Scanning tunnelling microscopy

UR - http://www.scopus.com/inward/record.url?scp=85054716130&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2018.08.113

DO - 10.1016/j.electacta.2018.08.113

M3 - Article

VL - 292

SP - 309

EP - 321

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -

ID: 29792412