Thermoelectric Properties of Polyaniline Films with Different Doping Concentrations of (±)-10-Camphorsulfonic Acid
Thermoelectric Properties of Polyaniline Films with Different Doping Concentrations of (±)-10-Camphorsulfonic Acid
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DOI：
10.1007/s11664-012-2368-z
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发表时间：
2013-07
影响因子：
2.1
通讯作者：
H. Anno;M. Hokazono;F. Akagi;M. Hojo;N. Toshima
中科院分区：
文献类型：
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作者：
H. Anno;M. Hokazono;F. Akagi;M. Hojo;N. Toshima
研究了不同浓度的（±）-10-邻苯二磺酸（CSA）掺杂聚苯胺（PANI）薄膜的热电性能随温度的变化关系，CSA与两个苯基氮单元的摩尔比x = 1 ~ 0.2。所有的PANI-CSA膜均为双位p型导电。具有低CSA浓度的膜的电导率的温度依赖性与可变范围跳跃的传输机制是一致的。另一方面，在室温以上的塞贝克系数显示出随温度的线性增加，归因于PANI-CSA的金属性质。随着CSA浓度的降低，塞贝克系数的绝对值增加，而电导率极大地降低，这可能是由于不仅载流子浓度的变化，而且结构无序程度的变化。功率因数随着CSA浓度向x = 1（最大限值）的增加而单调增加。在x = 1的情况下，CSA-PANI膜的热导率值在贯穿面方向上低至约0.20 W m-1 K-1，在面内方向上低至约0.67 W m-1 K-1。平面方向的热电优值估计约为1 × 10− 3（x = 1）。
The temperature dependence of the thermoelectric properties was investigated for polyaniline (PANI) films doped with different concentrations of (±)-10-camphorsulfonic acid (CSA) with molar ratioxof CSA to two phenyl-nitrogen units ofx= 1 to 0.2. All PANI-CSA films exhibitp-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 towardx= 1 (the maximum limit). The thermal conductivity value of CSA-PANI film withx= 1 is as low as about 0.20 W m−1K−1in the through-plane direction and about 0.67 W m−1K−1in the in-plane direction. The thermoelectric figure of meritZTin the in-plane direction is estimated to be approximately 1 × 10−3forx= 1.