Synthesis and structural characterization of thin multi-walled carbon nanotubes with a partially facetted cross section by a floating reactant method |
| |
Authors: | YA Kim M Endo Y Kaburagi J Shan S Tsuruoka |
| |
Affiliation: | a Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan b Faculty of Engineering, Musashi Institute of Technology, Tamazutsumi, Setagaya-Ku, Tokyo 158-8557, Japan c Bussan Nanotech Research Institute Inc., 600 Tanaka-cho, Akishima, Tokyo 196-8522, Japan |
| |
Abstract: | Here we describe synthesis of very unusual multi-walled carbon nanotubes through a catalytic chemical vapor deposition method using a floating reactant method and subsequent thermal treatment up to 2600 °C in a large quantity. Main characteristics of these nanotubes are (1) relatively wide distribution of diameters ranging from 20 to 70 nm and linear, long macro-morphology (aspect ratio >100), (2) highly straight and crystalline layers, (3) high purity through removal of metallic impurity, (4) very low interlayer spacing (0.3385 nm) and low R value (ID/IG = 0.0717), (5) high G′ intensity over intensity of G band (G′/G = 0.85) and strongly negative magnetoresistance value of −1.08% at 77 K and 1 T. The unusual microstructure of thin multi-walled carbon nanotubes with a partially facetted cross-sectional shape caused by thermal treatment is mainly ascribed to abrupt density changes (from 1.89 to 2.1 g/cm3) within a confined nanosized space, accompanying with the phase separation. |
| |
Keywords: | Carbon nanotubes Thermal treatment Transmission electron microscopy Microstructure |
本文献已被 ScienceDirect 等数据库收录! |
|