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Fast pulsed amperometric waveform for miniaturised flow-through electrochemical detection: Application in monitoring graphene oxide reduction

Citation

Islam, MA and Koreshkova, AN and Gupta, V and Lewis, T and Macka, M and Paull, B and Mahbub, P, Fast pulsed amperometric waveform for miniaturised flow-through electrochemical detection: Application in monitoring graphene oxide reduction, Electrochimica Acta, 328 Article 135087. ISSN 0013-4686 (2019) [Refereed Article]


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DOI: doi:10.1016/j.electacta.2019.135087

Abstract

A fast pulsed waveform (2-steps at +400mV and −400 mV, 10ms each, 50Hz cycle repetition) was developed incorporated within a miniaturised EC detector, and used to demonstrate the pulsed amperometric detection (PAD) of hydrazine in a flow-based analytical system. In contrast to standard amperometric detection (AD), a subsequent surface oxide reduction step was applied within the PAD waveform. The PAD applied within a simple flow-injection analysis (FIA) method provided a limit of detection (LOD) just as low as 0.8nM of hydrazine (RSD 5%, n=9, linearity r2 = 0.99 for 1 nM-100 μM), which is one order of magnitude lower than the lowest LOD reported todate. Significantly, the LOD was obtained using 520 times lower electrode surface area, flow rate, and sample volume, than in previous methods, with 15 times faster cycle repetition frequency than alternative PAD based studies reported in literature. Practical application of the PAD waveform was demonstrated by monitoring the temporal consumption of reducing agents during graphene oxide reduction experiments, separated using chromatographic methods (hydrazine in IC and ascorbic acid in HPLC).

Item Details

Item Type:Refereed Article
Keywords:pulsed amperometric detection and fast waveform, miniaturised flow-based electrochemical detection, hydrazine and ascorbic acid, graphene oxide reduction
Research Division:Chemical Sciences
Research Group:Physical Chemistry (incl. Structural)
Research Field:Electrochemistry
Objective Division:Manufacturing
Objective Group:Industrial Chemicals and Related Products
Objective Field:Industrial Chemicals and Related Products not elsewhere classified
UTAS Author:Islam, MA (Mr Arif Islam)
UTAS Author:Koreshkova, AN (Ms Aleksandra Koreshkova)
UTAS Author:Gupta, V (Dr Vipul Gupta)
UTAS Author:Lewis, T (Associate Professor Trevor Lewis)
UTAS Author:Macka, M (Professor Mirek Macka)
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Mahbub, P (Dr Parvez Mahbub)
ID Code:135449
Year Published:2019
Deposited By:Chemistry
Deposited On:2019-10-21
Last Modified:2019-12-24
Downloads:0

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