Modulating Electrode Kinetics for Discrimination of Dopamine by a PEDOT:COOH Interface Doped with Negatively Charged Tricarboxylate

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dc.contributor.authorMeng, Lingyin
dc.contributor.authorTurner, Anthony P. F.
dc.contributor.authorMak, Wing Cheung
dc.date.accessioned2020-10-20T10:42:52Z
dc.date.available2020-10-20T10:42:52Z
dc.date.issued2019-08-26
dc.description.abstractThe rapidly developing field of conducting polymers in organic electronics has many implications for bioelectronics. For biosensing applications, tailoring the functionalities of the conducting polymer’s surface is an efficient approach to improve both sensitivity and selectivity. Here, we demonstrated a facile and economic approach for the fabrication of a high-density, negatively charged carboxylic-acid-group-functionalized PEDOT (PEDOT:COOH) using an inexpensive ternary carboxylic acid, citrate, as a dopant. The polymerization efficiency was significantly improved by the addition of LiClO4 as a supporting electrolyte yielding a dense PEDOT:COOH sensing interface. The resulting PEDOT:COOH interface had a high surface density of carboxylic acid groups of 0.129 μmol/cm2 as quantified by the toluidine blue O (TBO) staining technique. The dopamine response measured with the PEDOT:COOH sensing interface was characterized by cyclic voltammetry with a significantly reduced ΔEp of 90 mV and a 3-fold increase in the Ipa value compared with those of the nonfunctionalized PEDOT sensing interface. Moreover, the cyclic voltammetry and electrochemical impedance spectroscopy results demonstrated the increased electrode kinetics and highly selective discrimination of dopamine (DA) in the presence of the interferents ascorbic acid (AA) and uric acid (UA), which resulted from the introduction of negatively charged carboxylic acid groups. The negatively charged carboxylic acid groups could favor the transfer, preconcentration, and permeation of positively charged DA to deliver improved sensing performance while repelling the negatively charged AA and UA interferents. The PEDOT:COOH interface facilitated measurement of dopamine over the range of 1–85 μM, with a sensitivity of 0.228 μA μM–1, which is 4.1 times higher than that of a nonfunctionalized PEDOT electrode (0.055 μA μM–1). Our results demonstrate the feasibility of a simple and economic fabrication of a high-density PEDOT:COOH interface for chemical sensing, which also has the potential for coupling with other biorecognition molecules via carboxylic acid moieties for the development of a range of advanced PEDOT-based biosensorsen_UK
dc.identifier.citationMeng L, Turner APF, Mak WC. (2019) Modulating Electrode Kinetics for Discrimination of Dopamine by a PEDOT:COOH Interface Doped with Negatively Charged Tricarboxylate. ACS Applied Materials and Interfaces, Volume 11, Issue 37, 2019, pp. 34497-34506en_UK
dc.identifier.issn1944-8244
dc.identifier.urihttps://doi.org/10.1021/acsami.9b12946
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15904
dc.language.isoenen_UK
dc.publisherAmerican Chemical Societyen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectelectrode kineticsen_UK
dc.subjectdopamine discriminationen_UK
dc.subjectcarboxylic acid groupsen_UK
dc.subjectcitrate dopingen_UK
dc.subjectPEDOTen_UK
dc.titleModulating Electrode Kinetics for Discrimination of Dopamine by a PEDOT:COOH Interface Doped with Negatively Charged Tricarboxylateen_UK
dc.typeArticleen_UK

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