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Polyaniline coated micro-capillaries for continuous flow analysis of aqueous solutions

Florea, Larisa orcid logoORCID: 0000-0002-4704-2393, Diamond, Dermot orcid logoORCID: 0000-0003-2944-4839 and Benito-Lopez, Fernando orcid logoORCID: 0000-0003-0699-5507 (2013) Polyaniline coated micro-capillaries for continuous flow analysis of aqueous solutions. Analytica Chimica Acta, 759 . pp. 1-7. ISSN 0003-2670

Abstract
The inner walls of fused silica micro-capillaries were successfully coated with polyaniline nanofibres using the “grafting” approach. The optical response of polyaniline coatings was evaluated during the subsequent redoping–dedoping processes with hydrochloric acid and ammonia solutions, respectively, that were passed inside the micro-capillary in continuous flow. The optical absorbance of the polyaniline coatings was measured and analysed in the wavelength interval of [300–850 nm] to determine its optical sensitivity to different concentrations of ammonia. It was found that the optical properties of polyaniline coatings change in response toammonia solutions in a wide concentration range from 0.2 ppm to 2000 ppm. The polyaniline coatings employed as a sensing material for the optical detection of aqueous ammonia have a fast response time and a fast regeneration time of less than 5 seconds at room temperature. The coating was fully characterised by Scanning Electron Microscopy, Raman Spectroscopy, absorbance measurements and kinetic studies. The response of the coatings showed very good reproducibility, demonstrating that this platform can be used for the development of micro-capillary integrated sensors based on the inherited sensing properties of polyaniline.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:polyaniline; continuous flow; sensor; ammonia; micro-capillary
Subjects:Physical Sciences > Chemistry
DCU Faculties and Centres:Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.aca.2012.11.027
Copyright Information:© 2013 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Irish Research Council, Science Foundation Ireland under the CLARITY award (07/CE/I1147).
ID Code:17679
Deposited On:20 Dec 2012 10:33 by Larisa Florea . Last Modified 17 Sep 2018 12:39
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