Nov 20, 2014 - voltammetry with the electro active potassium hexacyanoferrate(II). The ... electrochemical device was tested with a range of potassium.
University of Colombo, Sri Lanka
Annual Research Symposium 2014
University-Industry Collaboration to Strengthen the Knowledge Hub of Sri Lanka
PROCEEDINGS November 20th - 21st 2014
Proceedings of the Annual Research Symposium 2014, University of Colombo, November 20 th - 21 st 2014
Fabrication and Development of Novel and Simple Paper-based Electrochemical Devices N. A. A. B. Nissanka, H. H. A. M. Ruvini, T. G. Vithanage, H. R. Perera and Migelhewa N. Kaumal Department of Chemistry This paper describes the fabrication and the characterization of a simple electrode system that can be used in paper based electrochemical devices. Paper based electrochemical devices have emerged as a simple and powerful platform for the development of low cost analytical devices. Commercially available varnish paint was used as an alternative for the previously reported wax based fabrication methods. The channels and detection/reaction zones were developed using hydrophobic varnish patterns on filter papers. A three electrode system was constructed on the detection/reaction zone by drawing working and counter electrodes using commercially available graphite pencils. The reference electrode was drawn using conductive silver paint which is different from silver/ silver chloride paint previously reported in literature. The electrochemical behavior was characterized using cyclic voltammetry with the electro active potassium hexacyanoferrate(II). The voltammograms exhibit sharp peaks at 0.1 V and 4.0 V potentials which are the typical values for potassium hexacyanoferrate(II). Prepared paper-based electrochemical device was tested with a range of potassium hexacyanoferrate(II) concentrations (1, 2, 4, 5 mM). Resultant anodic and cathodic peak currents showed a linear relationship (y = 1 10-06x + 3 1006 , R² = 0.9646 and y = 2 10-06x + 6 10-06, R² = 0.9584) of with the concentrations of potassium hexacyanoferrate(II). Based on these results, it can be concluded that these simple and novel fabrication and electrode development methods are suitable for the fabrication of paper-based electrochemical devices. Keywords: paper-based voltammetry.
