Effective Production of Poly(3-alkylthiophene) Nanofibers by means of Whisker Method using Anisole Solvent: Structural, Optical, and Electrical Properties
Effective Production of Poly(3-alkylthiophene) Nanofibers by means of Whisker Method using Anisole Solvent: Structural, Optical, and Electrical Properties
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DOI：
10.1021/ma801128v
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发表时间：
2008-11-11
期刊：
影响因子：
5.5
通讯作者：
Ito, Kohzo
中科院分区：
文献类型：
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作者：
Samitsu, Sadaki;Shimomura, Takeshi;Ito, Kohzo
为了有效地制备高长径比聚(3-烷基噻吩基)(P3AT)纳米纤维，开发了以苯甲醚为溶剂的晶须法制备高长径比聚(3-烷基噻吩基)(P3AT)纳米纤维，并研究了烷基链长对纳米纤维形成的影响及其性能。纳米纤维具有高度为3-4 nm、宽度为24-27 nm的各向异性横截面，其横截面随着烷基链长的增加而略有增加，长径比达到100-1000。纳米纤维由104多个平行堆叠的沿纳米纤维长轴延伸的聚合物骨架和由烷基侧链隔开的2-3层聚合物骨架层组成。纳米纤维的形成源于聚合物主链之间具有吸引力的pi-pi*相互作用和烷基侧链的结晶所诱导的P3AT的准一维结晶。掺AuCl3纳米网络和单根纳米纤维的载流子输运性质都可以用准一维可变范围跳跃(VRH)模型来解释，而与烷基链长无关，这表明局域化载流子的随机势的起源不应该归因于纳米根之间的桥接，而应该归因于单个纳米纤维所涉及的某些因素。
The whisker method using anisole solvent was developed for effective production of high-aspect-ratio poly (3-alkylthiophene) (P3AT) nanofibers, and alkyl chain length dependence on nanofiber formation and their properties were fully investigated. The nanofibers have an anisotropic cross section of 3-4 nm height and 24-27 nm width, which slightly increase with the alkyl chain length, and the aspect ratio reaches 100-1000. The nanofibers consist of more than 104 parallel stacks of the extended polymer backbones along the nanofiber long axis and of 2-3 laminated layers of the polymer backbones separated by alkyl side chains. The nanofiber formation originates from quasi-one-dimensional crystallization of P3ATs induced by both an attractive pi-pi* interaction between polymer backbones and the crystallization of alkyl side chains. Carrier transport properties of a AuCl3-doped nanotiber network and single nanofibers, both of which are explained by a quasi-one-dimensional variable-range hopping (VRH) model irrespective of alkyl chain length, indicate that the origin of the random potential that localizes the carriers should be attributed not to the bridges between nanotibers but to some factor involved in a single nanofiber.