2009 年 60 巻 4 号 p. 262
Carbon nanotubes (CNT) are generally obtained using vapor phase methods such as CVD, for which catalytic metals are necessary for carbon deposition. Recently, a liquid phase method was also developed for preparing CNTs. This method is simpler than usual vapor phase methods. We studied preparation of CNTs using this liquid phase method with an alcohol solution and non-catalytic substrates, and observed CNT production. In this study, we investigated CNT preparation using liquid phase method with ohmic heating of substrates in an alcohol solution. Mainly, Ti was used as the substrate and CH3OH was used as the reactant. The substrate was chemically polished and washed with acetone before the experiments. After the substrate was soaked in the alcohol solution, the CNT preparation experiments were started. Fiber-shaped deposits were observed on the Ti substrate using SEM. Evaluation by Raman spectroscopy revealed spectra attributable to single-wall carbon nanotubes [SWCNTs] on Ti and Zr substrates. Fiber-shaped deposits in the SEM image were identified as CNTs using Raman spectroscopy. Results show that the Ti substrate was the most effective for preparation of CNT using a liquid phase method by ohmic heating of substrates in an alcohol solution.