Recent Progress in Disposable Ion-Selective Sensors for Environmental Applications

Abstract:

Solid-contact Ion Selective Electrodes (SC-ISEs) for the detection of lead are prepared on screen printed substrates in order to have low-cost and disposable sensors which may be useful in long-term environmental monitoring. It is shown that the materials used as solid contact layer, the deposition techniques and their thickness affect greatly the performances of the sensors. Poly(3-octylthiophene-2,5-diyl) (POT) and poly-3,4-ethylenedioxithiophene (PEDOT) are employed in this investigation. A trend showing an optimum is found for sensors prepared with POT as the batch reproducibility depends on the amount drop-cast, i.e., thickness. In case of PEDOT which is grown amperometrically the trend is more complex but an optimum for the batch reproducibility is again found depending on the current density. In the latter case, the film thickness and the overoxidation degree of the polymer probably concur in determining a more complex relationship.

• Periodical: Advances in Science and Technology (Volume 77)
• Pages: 65-70
• DOI: https://doi.org/10.4028/www.scientific.net/AST.77.65
• Online since: September 2012
• Authors: Giusy Matzeu, Claudio Zuliani, Dermot Diamond
• Keywords: Conducting Polymer, Environmental Sensor, Ion-Selective Electrode (ISE), Lead Detection, Water Quality

References

[1] C. Zuliani, D. Diamond, Opportunities and Challenges of using Ion-Selective Electrodes in Environmental Monitoring and Wearable Sensors, Electrochim. Acta. (2012), In Press.

DOI: 10.1016/j.electacta.2012.04.147

[2] D. Diamond, S. Coyle, S. Scarmagnani, J. Hayes, Wireless Sensor Networks and Chemo-/Biosensing, Chemical Reviews. 108 (2007) 652.

DOI: 10.1021/cr0681187

[3] R. Byrne, D. Diamond, Chemo/bio-sensor networks, Nature Materials. 5 (2006) 421.

[4] S. Anastasova, A. Radu, G. Matzeu, C. Zuliani, U. Mattinen, J. Bobacka, D. Diamond, Disposable solid-contact ion-selective electrodes for environmental monitoring of lead with ppb limit-of-detection, Electrochim. Acta. 73 (2012) 93-97.

DOI: 10.1016/j.electacta.2011.10.089

[5] J. Bobacka, A. Ivaska, Chemical Sensors based on conducting polymers, in: S. Cosnier and A. Karyakin (Ed.), Electropolymerization. Concepts, Materials, and Applications, Wiley-VCH, Weinheim, Germany, 2010, p.173.

DOI: 10.1002/9783527630592.ch9

[6] J. Bobacka, A. Ivaska, Electrochemical Sensor Analysis, in: Alegret, S., Merkoçi, A. (Ed.), Comprehensive Analytical Chemistry, Elsevier, 2007, p.73.

[7] J. Bobacka, A. Ivaska, A. Lewenstam, Potentiometric Ion Sensors, Chemical Reviews. 108 (2008) 329.

DOI: 10.1021/cr068100w

[8] G. Matzeu, C. Zuliani, D. Orpen, D. Diamond, (in preparation).

[9] X. Du, Z. Wang, Effects of polymerization potential on the properties of electrosynthesized PEDOT films, Electrochim. Acta. 48 (2003) 1713-1717.

DOI: 10.1016/s0013-4686(03)00143-9

[10] B. Paczosa-Bator, J. Peltonen, J. Bobacka, A. Lewenstam, Influence of morphology and topography on potentiometric response of magnesium and calcium sensitive PEDOT films doped with adenosine triphosphate (ATP), Anal. Chim. Acta. 555 (2006) 118-127.

DOI: 10.1016/j.aca.2005.08.085

[11] J. Bobacka, A. Lewenstam, A. Ivaska, Electrochemical impedance spectroscopy of oxidized poly(3,4-ethylenedioxythiophene) film electrodes in aqueous solutions, J Electroanal Chem. 489 (2000) 17-27.

DOI: 10.1016/s0022-0728(00)00206-0