Self-Assembly of Carbazole-Based Dendrimers by Solvent Vapor Annealing: From Fibers to Spherulites

详细信息    查看全文

• 作者：Zicheng Ding ; Rubo Xing ; Lidong Zheng ; Yue Sun ; Xingdong Wang ; Junqiao Ding ; Lixiang Wang ; Yanchun Han
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：December 29, 2011
• 年：2011
• 卷：115
• 期：51
• 页码：15159-15166
• 全文大小：1129K
• 年卷期：v.115,no.51(December 29, 2011)
• ISSN：1520-5207

文摘

The self-assembly behavior of H1-BCz, a first-generation dendrimer with phenyl-carbazole as core and carbazole as dendrons, was systemically studied by solvent-vapor annealing. The morphologies of spin-coated H1-BCz film on various substrates changed from giant crystalline fibers of several millimeters to spherulites with a decrease in tetrahydrofuran vapor pressure. At high vapor pressure, dewetting easily took place in the amorphous films, and single fibers or fiber clusters formed. The fibers grew from nuclei formed at the place where it does not dewet. The fibers grew larger by continuous nucleation and growth at the growth front of the fiber until all the substance on the substrate was consumed. As the vapor pressure decreased, dewetting did not so easily happen, and fibers packed more tightly and spherulites were obtained. Through characterization of the crystals and films, we speculate that 3D H1-BCz crystal formed by overlapping 2D lamellar structure. The 蟺鈥撓€ interactions and van der Waals interactions among H1-BCz molecules and solvent may be the main force driving the self-assembly of H1-BCz.