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Sensors 2015, 15(9), 22343-22363; doi:10.3390/s150922343

Electrochemical Interrogation of G3-Poly(propylene thiophenoimine) Dendritic Star Polymer in Phenanthrene Sensing

Sensor Lab, Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa
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Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 7 June 2015 / Revised: 23 August 2015 / Accepted: 27 August 2015 / Published: 3 September 2015
(This article belongs to the Section Chemical Sensors)
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Abstract

A novel dendritic star-copolymer, generation 3 poly(propylene thiophenoimine) (G3PPT)-co-poly(3-hexylthiophene) (P3HT) star co-polymer on gold electrode (i.e., Au|G3PPT-co-P3HT) was used as a sensor system for the determination of phenanthrene (PHE). The G3PPT-co-P3HT star co-polymer was synthesized via in situ electrochemical co-polymerization of generation 3 poly (propylene thiophenoimine) and poly (3-hexylthiophene) on gold electrode. 1HNMR spectroscopy was used to determine the regioregularity of the polymer composites, whereas Fourier transform infrared spectroscopy and scanning electron microscopy were used to study their structural and morphological properties. Au|G3PPT-co-P3HT in the absence of PHE, exhibited reversible electrochemistry attributable to the oligo (thiophene) ‘pendants’ of the dendrimer. PHE produced an increase in the voltammetric signals (anodic currents) due to its oxidation on the dendritic material to produce catalytic current, thereby suggesting the suitability of the Au|G3PPT-co-P3HT electrode as a PHE sensor. The electrocatalysis of PHE was made possible by the rigid and planar oligo-P3HT species (formed upon the oxidation of the oligo (thiophene) pendants of the star-copolymer), which allowed the efficient capture (binding) and detection (electrocatalytic oxidation) of PHE molecules. View Full-Text
Keywords: alternating current voltammetry; cyclic voltammetry; square wave voltammetry; phenanthrene; star-copolymer sensor alternating current voltammetry; cyclic voltammetry; square wave voltammetry; phenanthrene; star-copolymer sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Makelane, H.R.; Tovide, O.; Sunday, C.E.; Waryo, T.; Iwuoha, E.I. Electrochemical Interrogation of G3-Poly(propylene thiophenoimine) Dendritic Star Polymer in Phenanthrene Sensing. Sensors 2015, 15, 22343-22363.

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