Understanding the Formation Process of Exceptionally Long Fullerene-Based Nanowires

摘要

In a recent study [1], it was demonstrated that exceptionally long fullerene nanowires, with a length-to-width aspect ratio as large as ~3000-5000, can be grown from 1,2,4-trimethylbenzene solution of C_(60). We have performed a thorough theoretical analysis, aiming at gaining an in-depth understanding of the exceptionally large aspect ratio of C_(60)-based nanowires. By accounting for different interactions in the system we have calculated the structures of the unit cell and determined the role of the fullerene and of the solvent molecules in the crystallization process of the nanowires. We have calculated the adhesion energy of C_(60) molecules to the nanowire surface, and on the basis of this explained the growth anisotropy of the crystal. To get a more profound understanding of the nanowire growth mechanism we have also considered the influence of electron polarization on the growth anisotropy and studied the possible polymerization reactions occurred between the C_(60) and the solvent molecules.