Conductive poly(3-hexylthiophene) nanofibers and single crystals covered by coily dielectric oligomers and distinctions between their structures developed by self-seeding and isothermal approaches
Conductive poly(3-hexylthiophene) nanofibers and single crystals covered by coily dielectric oligomers and distinctions between their structures developed by self-seeding and isothermal approaches
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DOI：
10.1007/s13738-017-1239-1
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发表时间：
2018-02-01
影响因子：
2.4
通讯作者：
Abbasi, Farhang
中科院分区：
文献类型：
--
作者：
Agbolaghi, Samira;Zenoozi, Sahar;Abbasi, Farhang
比较了使用聚（3-己基噻吩）（P3 HT）-嵌段-线圈低聚物开发的模糊纳米纤维和单晶。掠射广角X射线散射和选区电子衍射结果表明，P3 HT纳米纤维和单晶主要为侧边生长，聚苯乙烯、聚甲基丙烯酸甲酯和聚乙二醇的介电线圈块覆盖在P3 HT纳米纤维和单晶表面，导致P3 HT主链纵向的晶体表面出现刷状区域。原子力显微镜观察表明，自引晶法生长的单晶体比相应的纳米纤维（长0.8-21 μ m，厚1.5-23 nm）明显长（26-181 μ m）和厚（59 nm-1.4 μ m）。P3 HT主链在单晶中在己基侧链和π-π堆积方向上也更紧密地堆积，特别是在甲苯中（13.42-14.63和3.30-3.47埃）比在纳米纤维中（15.03-16.17和3.51-3.67埃）。端线圈块导致纳米纤维和单晶中的层间距略高。较短的P3 HT链在单晶中彼此层叠;然而，它们大多在纳米纤维中延伸。极性溶剂、较低的结晶温度和较短的P3 HT链增加了单晶中的骨架层压。
Fuzzy nanofibers and single crystals developed using poly(3-hexylthiophene) (P3HT)-block-coily oligomers were compared. Based on grazing wide angle X-ray scattering and selected area electron diffraction patterns, grown crystalline structures were mainly edge-on. P3HT fuzzy nanofibers and single crystals were covered by the dielectric coily blocks of polystyrene, poly(methyl methacrylate), and poly(ethylene glycol), leading to brush-like regions on surface of crystals in longitude of P3HT backbones. The atomic force microscopy demonstrated that the single crystals grown by self-seeding method were significantly longer (26-181 mu m) and thicker (59 nm-1.4 mu m) than the corresponding nanofibers (0.8-21 mu m in length and 1.5-23 nm in thickness). P3HT backbones were also more intimately stacked in single crystals in both hexyl side chains and pi-pi stacking directions, particularly in toluene (13.42-14.63 and 3.30-3.47 angstrom) than in nanofibers (15.03-16.17 and 3.51-3.67 angstrom). End coily blocks resulted in slightly higher layer spacings in both nanofibers and single crystals. Shorter P3HT chains were laminated on each other in single crystals; however, they were mostly extended in the nanofibers. Poorer solvents, lower crystallization temperatures, and shorter P3HT chains increased the backbone lamination in single crystals.