Large Change of Electrical Conductivity and Absorption Spectrum of Poly(3-alkylthiophene) at the Solid-Liquid Phase Transition
Large Change of Electrical Conductivity and Absorption Spectrum of Poly(3-alkylthiophene) at the Solid-Liquid Phase Transition
复制标题
聚(3-烷基噻吩)固液相变时电导率和吸收光谱的大变化
DOI：
10.1143/jjap.27.l1612
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
R. Sugimoto
中科院分区：
文献类型：
--
作者：
K. Yoshino;D. Park;Bok;M. Onoda;R. Sugimoto
聚（3-烷基噻吩）如聚（3-十二烷基噻吩）和聚（3-二十二烷基噻吩）的电导率在熔点以阶梯方式降低。吸收光谱在相变时也迅速变化。这些现象进行了讨论，在液体状态下，由于噻吩环的共面性的降低伴随着显着的构象变化的能量带隙的增加。在电导率和吸收光谱的温度依赖性中也观察到大的滞后。在预熔区的热色性可以解释为有效缩短共轭长度，由于在共轭链上的几个点上的噻吩环的扭转的引入。
Electrical conductivity of poly(3-alkylthiophene) such as poly(3-dodecylthiophene) and poly(3-docosylthiophene) decreases in a step-wise manner at the melting point. The absorption spectra also changes rapidly at the phase transition. These phenomena are discussed in terms of the increased energy band gap in the liquid state due to the decrease of the co-planarity of thiophene rings accompanied by remarkable conformation changes. Large hysteresis was also observed in the temperature dependence of conductivity and absorption spectra. Thermochromism in the premelting region can be explained by effective shortening of the conjugation length due to the introduction of torsion of the thiophene rings at several points on a conjugated chain.