Poly(3-alkylthiophenes) and polydiphenylamine copolymers: a comparative study using electrochemical impedance spectroscopy

被引:16
作者
Bento, Danielly Cristina [1 ]
Rodrigues Maia, Elaine Cristina [1 ]
Pinto Rodrigues, Paulo Rogerio [2 ]
Moore, Gregory J. [3 ]
Louarn, Guy [4 ]
de Santana, Henrique [1 ]
机构
[1] Univ Estadual Londrina, Dept Quim, BR-86051990 Londrina, PR, Brazil
[2] Univ Estadual, Ctr Oeste, Dept Quim, BR-85040080 Guarapuava, PR, Brazil
[3] Yardney Tech Prod Inc, East Greenwich, RI USA
[4] Univ Nantes, CNRS, Inst Mat Jean Rouxel IMN, F-44322 Nantes, France
关键词
MORPHOLOGY; TRANSPORT; ELECTRODE; CELLS;
D O I
10.1007/s10854-013-1467-9
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This study compares the electrical properties of two homopolymers, poly(3-methylthiophene) and poly(3-octylthiophene), and their copolymers with polydiphenylamine, previously synthesized electrochemically on a platinum wire electrode (average area 0.19 cm(2)) in 0.100 mol L-1 LiClO4 at 18 A degrees C. Based on the cyclic voltammetry data from these systems, electrochemical impedance spectroscopy (EIS) was used to evaluate the resistive and capacitive properties of the homo- and copolymers using the open-circuit potential (OCP) and overvoltage potential methods. The copolymer of poly(3-methylthiophene) and polydiphenylamine showed lower resistivity between films obtained by OCP and overvoltage potential. For all EIS images obtained by overvoltage potential there was a drop in resistivity and lower variation among the capacitance values. Using a Bode plot, we observed two time constants related to the radical cation and dication species, as characterized by Raman spectroscopy. Using scanning electron microscopy, it was possible to observe the changes in the morphological structures of the copolymers by comparison with the homopolymers, confirming the influence of greater active area on the improved conductivity of the copolymers.
引用
收藏
页码:4732 / 4738
页数:7
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