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Wireless radio frequency detection of greatly simplified polymeric membranes based on a multifunctional ionic liquid

Kavanagh, Andrew and Matthias, Hilder and Noel , Clark and Radu, Aleksandar and Diamond, Dermot (2011) Wireless radio frequency detection of greatly simplified polymeric membranes based on a multifunctional ionic liquid. Electrochimica Acta, 56 (24). pp. 8947-8953. ISSN 0013-4686

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Abstract

In this paper, we report our ongoing investigations into the properties of poly(vinyl)chloride (PVC) based polymeric membranes incorporating the ionic liquid (IL) trihexyltetradecylphosphonium dicyanamide [P6,6,6,14][DCA] which fulfils several key functions - plasticiser, ligand and transducer dye. Upon co-ordination with Cu2+ ions, a yellow colour is generated within the membrane. Similarly exposure of a membrane to Co2+ ions produces a blue colour, whilst the IL is capable of co-ordinating both ions simultaneously, thereby generating a green optical response. Using Wireless Radio Frequency (WRF) detection however, the inherent conducting nature of these membranes can now also be exploited as a sensor signal. WRF is a novel detection technique which monitors the conductivity of a given sample wirelessly, allowing non-contact detection and measurement of IL-PVC membranes as they pass through the channel. The various co-ordinated membranes produce a discriminatory drop in the resulting signal, which is a direct function of the specific metal ion (Cu2+, Co2+ or a mixture) co-ordinated to the IL. The results of the novel WRF technique have been validated principally by electrochemical impedance spectroscopy (EIS) and also by portable x-ray fluorescence (XRF). Keywords: Ionic Liquids, Electrochemical Sensors, Polymeric Sensors

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Ionic liquids; Electrochemical sensors; Polymeric sensors
Subjects:Physical Sciences > Electrochemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.electacta.2011.07.121
Copyright Information:© 2011 Elsevier Ltd.
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland under grant 07/CE/I1147 including the SFI-funded National Access Programme (NAP) grant NAP210, Enterprise Ireland grant 07/RFP/MASF812, which is part of EU-MATERA initiative, DCU Career Start Fellowship 2008
ID Code:16492
Deposited On:07 Oct 2011 14:22 by Andrew Kavanagh. Last Modified 07 Oct 2011 14:22

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