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Abstract

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.

Biography

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.