Simultaneous Analysis Of Heavy Metal Ions Using Conductive Polymers Comprising Graphene | 18719
Journal of Analytical & Bioanalytical Techniques
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Functionalized polyterthiophenes comprising graphene were synthesized in a solution containing graphene and
functionalized tertiophene monomers, 3?-(2-aminopyrimidyl)-2,2?:5?,2??-terthiophene (APTT), 3?-2(carboxylic acid)-
2,2?:5?,2??-terthiophene (TTCA), and 3?-(p-benzoic acid)-2,2?:5?,2??-terthiophene (TTBA). Interaction between functional
groups of graphene oxide (GO) and the monomers in an aprotic nonaqueous solution offers the formation of uniform and
stable polymer film. Spectroelectrochemical properties of the conductive polymers were characterized employing in-situ UV-
Visible spectroscopy. Morphologies and compositions of the polymer materials were confirmed using SEM, FE-TEM, and XPS
analyses, which show homogeneous and functionalized poly(terthiophenes-GO) composition. We observed that the heavy
metal ions (Cd(II), Pb(II), Cu(II), and Hg(II)) can be deposited on the poly(APTT-GO) layer via the complex formation
reaction. Thus, stripping voltammetry was performed for the analysis of the ions in very low concentration by scanning the
potential from -1.0 to +0.5 V after pre-concentration. The results show the distinct anodic stripping peak of each ion at -0.75,
-0.49, -0.05, +0.15 V, corresponding to Cd(II), Pb(II), Cu(II), and Hg(II) ions, showing detection limit of ~1ppb.
Suk-Ho Baek received his Bachelor degree in 2013 from the Kosin University and now he is a Master student in the Pusan National University. His research
interests include heavy metal ions sensors for chemical real time applications.
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