Selective Nucleation of Poly(3-hexyl thiophene) Nanofibers on Multilayer Graphene Substrates
Selective Nucleation of Poly(3-hexyl thiophene) Nanofibers on Multilayer Graphene Substrates
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DOI：
10.1021/acsmacrolett.5b00038
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发表时间：
2015-05-01
影响因子：
7.015
通讯作者：
Hayward, Ryan C.
中科院分区：
文献类型：
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作者：
Acevedo-Cartagena, Daniel E.;Zhu, Jiaxin;Hayward, Ryan C.
我们证明，石墨烯表面提供高选择性的聚（3-己基噻吩）（P3 HT）纳米纤维（NF）从过饱和溶液的成核。溶剂条件被确定为引起结晶和熔融之间的广泛滞后，以室温为中心，产生亚稳的解决方案是稳定的，对均匀的成核长时间，但允许通过石墨烯的异质成核。P3 HT晶体的选择性生长被发现支持在Si或ITO衬底上的多层石墨烯（MLG），与成核动力学，是更快的MLG在Si上，但在这两种情况下慢于高度取向的热解石墨（HOPG）。虽然NFs垂直生长的基板上的面向P3 HT链的取向，我们观察到边缘上的取向在干燥的薄膜，大概是由于毛细管力，导致崩溃的NFs在溶剂蒸发到基板上。
We demonstrate that graphene surfaces provide highly selective nucleation of poly(3-hexyl thiophene) (P3HT) nanofibers (NFs) from supersaturated solutions. Solvent conditions are identified that give rise to a wide hysteresis between crystallization and melting centered around room temperature, yielding metastable solutions that are stable against homogeneous nucleation for long periods of time but that allow for heterogeneous nucleation by graphene. Selective growth of P3HT crystals is found for multilayer graphene (MLG) supported on either Si or ITO substrates, with nucleation kinetics that are more rapid for MLG on Si but slower in both cases than for highly oriented pyrolytic graphite (HOPG). Although the NFs grow vertically from the substrate with face-on orientation of P3HT chains, we observe edge-on orientation in dried films, presumably due to capillary forces that cause collapse of the NFs onto the substrate during solvent evaporation.