Thermal and electrical conduction properties of vertically aligned carbon nanotubes produced by water-assisted chemical vapor deposition

✍ Scribed by Atsuto Okamoto; Itaru Gunjishima; Takashi Inoue; Megumi Akoshima; Hidenori Miyagawa; Tomohito Nakano; Tetsuya Baba; Masaki Tanemura; Gendo Oomi

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 953 KB
• Volume: 49
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2010.09.024

✦ Synopsis

We present both thermal and electrical conduction properties of vertically aligned carbon nanotubes (VACNTs), synthesized by the water-assisted chemical vapor deposition method using Fe-Ti-O nanoparticles as catalyst. Thermal diffusivity and electrical resistance of VACNTs have been measured by the laser flash method and direct-current four-terminal method, respectively. The VACNTs are found to have thermal diffusivities of the same order as isotropic graphite and the electrical characteristics of semiconductors. The electrical resistance shows a T À1/4 temperature dependence, which implies that the conduction of electrons is dominated by 3D Mott variable range hopping.