Synthesis of carbon nanotubes on carbon fibers by means of two-step thermochemical vapor deposition

Nozomu Sonoyama, Mikio Ohshita, Akio Nijubu, Hidetoshi Nishikawa, Hironori Yanase, Hayashi Jun-Ichiro, Tadatoshi Chiba

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The present study aimed at development of a method for synthesizing multi-walled carbon nanotubes (CNTs) on carbon paper substrates (CP) at densities as high as those so far reported for CNTs formed on quartz substrates. Applying conditions optimized for CNTs synthesis on quartz substrates, in which CP was heated at 1073 K, being placed parallel to the flow of m-xylene/ferrocene vapor, resulted in formation of extremely few deposits on CP. Forced vapor flow through the CP greatly improved the frequency and homogeneity of deposition of the Fe-bearing nanoparticles, but these became encapsulated by carbon and deactivated. The addition of H2S to the vapor further enhanced nanoparticle deposition. Moreover, it enabled the subsequent formation of CNTs at densities as high as 2-6 × 109 cm-2. In order to realize such high population densities, it was found essential to perform CVD in a two-stage sequence commencing with nanoparticles deposition at 1073 K followed by the formation and growth of CNTs at 1273 K, with the H2S concentration in the vapor phase optimized throughout within a range of 0.014-0.034 vol%.

Original languageEnglish
Pages (from-to)1754-1761
Number of pages8
JournalCarbon
Volume44
Issue number9
DOIs
Publication statusPublished - Aug 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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