科研之友
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摘要
The self-assembly and crystal growth process of N,N'-di(9H-fluoren-9- ylidene)benzene-1,4-diamine (diFYBD) on mica have been studied by Atomic Force Microscopy (AFM). The solution concentration was found to significantly affect on the self-assembly process and crystal morphology. On the other hand, the π-conjugated molecular structure determined the molecular adsorption configurations on mica due to the π-πinteractions. At a lower concentration, the diFYBD molecules forming microcrystals assembled into the dendritic configuration. With the increasing solution concentration, the coverage was improved significantly and the porous membrane structure formed. At a higher concentration, the molecules grew into crystal blocks. The significant change of surface morphologies had a directly relationship with the depositional rate of microscrystals on the underlying lattice due to the solvent evaporation rate. The phenomenon provides directly insight into organic crystal nucleation, growth, as well as the surface morphological evolution process.
- 出版日期2010-12
- 单位华南理工大学
