Synthesis and thermoelectric properties of hydrochloric acid-doped polyaniline

• Published in: Synthetic metals 2010-06, Vol.160 (11), p.1153-1158
• Main Authors: Li, Junjie, Tang, Xinfeng, Li, Han, Yan, Yonggao, Zhang, Qingjie
• Format: Article
• Language: English
• Subjects: Applied sciences; Coefficients; Electrical conductivity; Electrical resistivity; Exact sciences and technology; Hydrochloric acid-doping; Metallic character; Organic polymers; Physicochemistry of polymers; Polyaniline; Polyanilines; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Resistivity; Synthesis; Temperature dependence; Thermoelectric properties; Thermoelectricity; Trends
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2010.03.001

A series of hydrochloric acid-doped polyaniline (PANI) were prepared by chemical oxidative polymerization. And the effects of HCl-doping concentration on the thermoelectric properties in the temperature range of 303–423 K were discussed. The results show that an increase in HCl-doping concentration will lead to a trend of first increase and then decrease in both the electrical conductivity and thermoelectric figure-of-merit ZT, accompanied by the opposite trend of the Seebeck coefficient. The maximum ZT can reach 2.67 × 10 −4 at 423 K when HCl-doping concentration is 1.0 M. Moreover, the temperature dependence of the electrical conductivity shows a transition from non-metallic to metallic sign with doping level increasing, while the Seebeck coefficient of all the samples has a metallic character.