Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration
Natsumi Komatsu, Motonori Nakamura, Saunab Ghosh, Daeun Kim, Haoze Chen, Atsuhiro Katagiri, Yohei Yomogida, Weilu Gao, Kazuhiro Yanagi, Junichiro Kono
Abstract
, 633). However, a full understanding of the mechanism of such global alignment has not been achieved. Here, we report results of a series of systematic experiments that demonstrate that the CNT alignment direction can be controlled by the surface morphology of the filter membrane used in the vacuum filtration process. More specifically, we found that the direction of parallel grooves pre-existing on the surface of the filter membrane dictates the direction of the resulting CNT alignment. Furthermore, we intentionally imprinted periodically spaced parallel grooves on a filter membrane using a diffraction grating, which successfully defined the direction of the global alignment of CNTs in a precise and reproducible manner. These results are promising not only for developing novel devices based on macroscopically aligned CNTs but also for understanding the microscopic physical mechanism of the alignment process.