State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate University of the Chinese Academy of Sciences, People's Republic of China.
Phys Chem Chem Phys. 2013 Jan 28;15(4):1208-15. doi: 10.1039/c2cp42614e.
This work focuses on both the structure manipulation and the crystallizing mechanism investigation of the well-known methanofullerene, [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM). PCBM crystals with two novel structures, i.e., five-fold twinned and cubic crystals are obtained by the introduction of the mica substrate and the polymer blenders (P3HT and PS) into PCBM thin films under thermal annealing. The morphology and nanostructure of these crystals have been well investigated with AFM, TEM and XRD techniques. The roles of the mica substrate and the polymer blenders have been studied by varying the annealing temperature, the substrate, the polymer benders and the blending ratio. It has been proved that both the PCBM intermolecular and PCBM-mica interactions influence the PCBM crystallization process. The mica substrate has been proved to have the epitaxial effect on PCBM crystallization. The polymer blenders have been suggested to weaken the PCBM intermolecular interaction and limit PCBM molecular diffusion.
这项工作重点研究了著名的富勒烯衍生物[6,6]-苯基-C（61）-丁酸甲酯（PCBM）的结构调控和结晶机制。通过在热退火过程中将云母衬底和聚合物共混剂（P3HT 和 PS）引入 PCBM 薄膜中，得到了两种新型结构的 PCBM 晶体，即五重孪晶和立方晶体。利用 AFM、TEM 和 XRD 技术对这些晶体的形貌和纳米结构进行了很好的研究。通过改变退火温度、衬底、聚合物共混剂和共混比，研究了云母衬底和聚合物共混剂的作用。结果证明，PCBM 分子间相互作用和 PCBM-云母相互作用都影响 PCBM 的结晶过程。云母衬底对 PCBM 的结晶具有外延效应。聚合物共混剂被认为可以削弱 PCBM 分子间相互作用并限制 PCBM 分子扩散。
