期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 42, 期 7, 页码 1346-1351出版社
SPRINGER
DOI: 10.1007/s11664-012-2368-z
关键词
Conducting polymer; polyaniline; doping concentration; variable-range hopping; thermoelectric properties; anisotropy
资金
- MEXT Regional Innovation Cluster Program (Global Type) Yamaguchi Green Valley
- JSPS KAKENHI [21310077]
- Grants-in-Aid for Scientific Research [21310077] Funding Source: KAKEN
The temperature dependence of the thermoelectric properties was investigated for polyaniline (PANI) films doped with different concentrations of (+/-)-10-camphorsulfonic acid (CSA) with molar ratio x of CSA to two phenyl-nitrogen units of x = 1 to 0.2. All PANI-CSA films exhibit p-type conduction. The temperature dependence of the electrical conductivity of the films with low CSA concentrations is consistent with a transport mechanism of variable-range hopping. On the other hand, the Seebeck coefficient above room temperature shows a linear increase with temperature, attributed to the metallic nature of PANI-CSA. As the CSA concentration decreases, the absolute value of the Seebeck coefficient increases while the electrical conductivity extremely decreases, probably due to the changes not only in the carrier concentration but also in the degree of structural disorder. The power factor increases monotonically with increasing CSA concentration toward x = 1 (the maximum limit). The thermal conductivity value of CSA-PANI film with x = 1 is as low as about 0.20 W m(-1) K-1 in the through-plane direction and about 0.67 W m(-1) K-1 in the in-plane direction. The thermoelectric figure of merit ZT in the in-plane direction is estimated to be approximately 1 x 10(-3) for x = 1.
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