Dual formation of carpets of large carbon nanofibers and thin crystalline carbon nanotubes from the same catalyst-underlayer system |
| |
| Authors: | Gilbert D Nessim Matteo Seita Kevin P O’Brien Scott A Speakman |
| |
| Affiliation: | aDepartment of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States;bDepartment of Materials, ETH Zürich, Wolfgang-Pauli-Str., CH-8093 Zürich, Switzerland;cComponents Research department, Intel Corporation, Hillsboro, OR 97124, United States;dCenter for Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States |
| |
| Abstract: | A dense, micron-tall layer of carbon nanofibers (CNFs) was grown above a layer of carbon nanotubes (CNTs) during the same synthesis using a thick cobalt catalyst (15 nm). The CNFs had large diameters (100 nm) and were amorphous while the CNTs had small diameter (10–20 nm) and were crystalline. Base growth mechanism was at play for both the nanofibers and the nanotubes. High-resolution transmission electron microscopy characterization suggested that the main mechanisms leading to the growth of the two structures were based on the dewetting of the catalyst layer and its subsequent alloying with the Ta underlayer. We can extend these principles to grow diverse carbon nanostructures during the same synthesis using appropriate multilayer thin films for different applications, especially for electrochemical cells and supercapacitors. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
