title: Chiral carbonaceous nanotubes containing twisted carbonaceous nanoribbons, prepared by the carbonization of chiral organic self-assemblies.
abstract: Single-handed helical silica nanotubes containing chiral organic self-assemblies were prepared by using a supramolecular templating approach. After carbonization and the removal of the silica, single-handed helical carbonaceous nanotubes that contained twisted carbonaceous nanoribbons were obtained. It is believed that the nanotubes formed as a result of the adsorption of low-molecular-weight gelators. The twisted nanoribbons were formed because of the carbonization of the organic self-assemblies. The samples were characterized by using field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and circular dichroism. For the samples carbonized at 900 °C for 3.0 h, a partially graphitized structure was identified. The circular dichroism (CD) spectra indicated that the twisted nanoribbons exhibited optical activity. The CD spectrum was simulated by using time-dependent density functional theory. The results suggested that the CD signals originated from the chiral stacking of aromatic rings.
authors: Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (P. R. China), Fax: (+86) 512-65882052.
authors: Hongjing
authors: H
authors: Huo
authors: Yi
authors: Y
authors: Li
authors: Yuan
authors: Y
authors: Yuan
authors: Shuwei
authors: S
authors: Lin
authors: Baozong
authors: B
authors: Li
authors: Mingliang
authors: M
authors: Wang
authors: Yonggang
authors: Y
authors: Yang
keywords: carbon; chirality; helicity; nanotubes; self-assembly