Determination of the dopant weight fraction in polyaniline films using a quartz-crystal microbalance

被引:34
作者
Ayad, M. M. [1 ]
Zaki, E. A.
Stejskal, J.
机构
[1] Tanta Univ, Fac Sci, Dept Chem, Tanta, Egypt
[2] Acad Sci Czech Republ, Inst Macromol Chem, CR-16206 Prague 6, Czech Republic
关键词
dopant weight fraction; polyaniline; polyaniline film; thin film; quartz-crystal microbalance;
D O I
10.1016/j.tsf.2007.05.057
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electrical conductivity of polyaniline depends on factors such as degree of oxidation, type of protonation, and dopant weight fraction. The last of these factors is connected with the loss of mass during the deprotonation of polyaniline, and can thus conveniently be determined in situ by the use of a quartz microbalance. This is illustrated in the present paper which concerns the determination of the weight fraction of acid in thin polyaniline films prepared by the chemical oxidation of aniline in the aqueous solutions of sulfuric and phosphoric acids. It is illustrated that the deprotonation-reprotonation processes are fast, complete, and reversible. Polyaniline has sulfate counter-ions in 0. 1 M sulfuric acid while, in 0.5-1 M sulfuric acid, hydrogen sulfate counter-ions are present. The quartz microbalance involving polyaniline films can be used in the sensing of the acidity. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:8381 / 8385
页数:5
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