Controlled electrocopolymerization of thiophene with N-ethyl carbazole: In-situ and EX-situ spectroelectrochemical investigation and conductivity relationship

Esma Sezer, A. Sezai Saraç*

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Özet

Polymerization of thiophene (Th) was studied in the presence of N-ethyl carbazole (ECz) by in-situ and ex-situ spectroelectrochemical measurements. In-situ spectroelectrochemical measurements allow determining some soluble thiophene oligomers. Cooligomeric species of Th-ECz (which give peaks at 376, 400 nm) are in parallel line with the findings from CV measurements (current values of peaks of electrogrowth of polymer). Results also suggest that ethylcarbazole and thiophene react on the electrode surface as well as in solution, and the percentage of ECz incorporated into the polymer structure is less than in the case of the electrode surface reaction. CV's of PECz, PTh and P [Th-co-ECz] formation indicate shifts in Ep and corresponding current changes. Increase in peak currents intensities of ECz in the presence of Th, Ip1 for ECz, Th, [Th-co-ECz] is 0.05 mA, 1.6 mA, 2.0 mA, respectively, giving a ratio of 1/32/40 (Ip1) and 1/9/21 (I p2) supporting the inclusion of ECz into copolymer structure. The conductivities of PTh and copolymer-measured by four-point-probe technique (at mole ratio of nTh/nEcz=25) were found as 42 mS/cm and 36 mS/cm, respectively, giving a ratio of 42/36 = 1.67, which is in line with Ip values of electro growth of copolymer on the Pt [i.e., for ratios of P[Th-co-Ecz]/PTh of Ip1, 40/32 = 1.3 and for Ip2=21/9 =2.3].

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)79-94
Sayfa sayısı16
DergiInternational Journal of Polymeric Materials and Polymeric Biomaterials
Hacim53
Basın numarası1
DOI'lar
Yayın durumuYayınlandı - Oca 2004

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