Browsing by Author "Tadesse, Beniam"
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Item Electrocatalysis at copolymer of 3- Methylthiophene and 3- Hexylthiophene modified electrodes(2007-03) Tadesse, Beniam; Yohannes, Teketel (PhD)The electrochemical polymerizations and characterization studies were made for the monomers 3-hexylthiophene (3HT) and 3-methylthiophene (3MT) with respect to Pt, GC and Au electrodes. The electrochemical properties of the corresponding polymers poly(3- hexylthiophene) (P3HT) , poly(3-methylthiophene) (P3MT) were also studied in a monomer free LiClO4 - acetonitrile solutions. Copolymers were shown to be electrochemically synthesized from the monomers 3HT and 3MT and showed intermediate electrochemical properties between their corresponding homopolymers. The optimum copolymer ratio, polymerization potential and deposition time that are required to obtain the best electrocatalytic effect was also demonstrated using various redox species. The electrocatalytic effect of this copolymer was studied on selected inorganic and organic samples. It was found that poly(3HT-co-3MT) modified platinum electrode is highly selective and sensitive towards these redox species. The detection limits for poly(3HT-co-3MT) modified Pt electrode were also shown for these redox species. Key words; poly(3-hexylthiophene), poly(3-methylthiophene), poly(3HT-co-3MT), Electrochemical Polymerization, Electrocatalysis.