Atomic force microscope characterization of self-assembly behaviors of cyclo[8] pyrrole on solid substrates

作者：Xu, Hai^*; Zhao, Siqi; Xiong, Xiang; Jiang, Jinzhi; Xu, Wei; Zhu, Daoben; Zhang, Yi; Liang, Wenjie; Cai, Jianfeng^*

来源：Chemical Physics Letters, 2017, 674: 151-156.

DOI：10.1016/j.cplett.2017.02.063

• Solution casting
• Self-assembly
• Porphyrin analogue
• pi-pi interaction

Cyclo [8] pyrrole (CP) is a porphyrin analogue containing eight alpha-conjugated pyrrole units which are arranged in a nearly coplanar conformation. The pi-pi interactions between CP molecules lead to regular aggregations through a solution casting process. Using tapping mode atomic force microscope (AFM), we investigated the morphology of self-assembled aggregates formed by deposition of different CP solutions on different substrates. We found that in the n-butanol solution, nanofibrous structures could be formed on the silicon or mica surface. Interestingly, on the highly oriented pyrolytic graphite (HOPG) surface, or silicon and mica surface with a toluene solution, only irregular spherical structures were identified. The difference in the nanomorphology may be attributed to distinct interactions between molecule-molecule, molecule-solvent and molecule-substrate.

• 出版日期2017-4-16
• 单位中国科学院; 中南大学