六溴三聚吲哚在不同溶剂中的可控自组装结构

Tunable Self-assemble Structures of Hexabromotriindole in Different Solvents

研究了六溴三聚吲哚在不同溶剂中的自组装行为,并通过改变溶剂的极性和沸点调控自组装结构。结果表明,通过向六溴三聚吲哚的N,N′-二甲基甲酰胺(DMF)溶液中添加不同极性的第2种溶剂(添加后六溴三聚吲哚为1×10-3 mol·L-1),其自组装结构可以进行调控。降低六溴三聚吲哚溶液的浓度(0.5×10-3 mol·L-1)发现,分子可自组装成岛状结构。表明分子自身间相互作用较强,分子首先堆积成较小的核,然后以此为中心向四周生长。添加极性较强的溶剂有利于分子的重组,形成较长的纳米线;添加非极性溶剂时分子容易团聚,生长的纳米线的长度较短。

A solution-processed hexabromotriindole self-assembly behavior on substrate have been investigated.The experimental results showed that the molecules closely stacked with each other and self-assembly into well-ordered nanostructure in protonic solvent（dimethylformamide） could be controlled through adding second solvent to different polarities with the evapoation of the solvents（hexabromotriindole 1×10-3 mol·L-1）.The addition of a higher polarity solvent facilitates the assembly of the molecules into longer and well-defined nanowires.The low polarity solvent will lead to shorter nanowires.The solution with a lower concentration（hexabromotriindole 0.5×10-3 mol·L-1） will assembly into well-identified ＂islands＂ on the substrate surface.This revealed that the intermolecular interactions are stranger than those of the interactions between molecules and substrate.