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Electrochemical Impedance Spectroscopic Measurements of Sexithiophene–Effect of the Electrode Nature and the Dopant (CuCl 2 ) Content
Author(s) -
NESSARK Belkacem,
MAOUCHE Naïma
Publication year - 2009
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200990107
Subject(s) - chemistry , electrode , dopant , conductivity , electrochemistry , doping , analytical chemistry (journal) , electrical impedance , redox , chloride , copper , inorganic chemistry , optoelectronics , materials science , organic chemistry , electrical engineering , engineering
Electrochemical impedance spectroscopic (EIS) measurements of sexithiophene (6T) were carried out according to the Pt/6T/M sandwich structure configuration, for various electrode materials (M=GC, ITO, Ag, Cu, Al) and for different doping levels of copper chloride (CuCl 2 ). The results demonstrate that two types of charge transport are involved in the redox process at the electrode/6T interface and inside the bulk oligomer. The complex‐plane impedance plots obtained for various doping levels of CuCl 2 exhibit arc shapes. The charge‐transfer resistance measured from the diagrams decreases systematically with the addition of the salt, leading to an increase of the oligothiophene conductivity.