CVD synthesis and purification of single-walled carbon nanotubes using silica-supported metal catalyst

R. Engel-Herbert, H. Pforte, T. Hesjedal

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

We report the growth of single-walled carbon nanotubes (SWNTs) from silica aerogel by methane chemical vapor deposition (CVD). Bimetallic Fe/Mo supported by amorphous silica forms nanostructures that are catalytically active at the growth temperature. Despite the flexibility gained by using silica as a support matrix, the as-grown nanotube samples need to be further purified for applications in nanodevices. Our experiments show that the treatment in hydrofluoric acid selectively removes the silica matrix,while the amorphous carbon deposits can be selectively removed by oxidation. The influence of the oxidation and etching parameters on the SWNT yield is discussed. The optimized purification procedure renders SWNTs only.

Original languageEnglish (US)
Pages (from-to)2589-2593
Number of pages5
JournalMaterials Letters
Volume61
Issue number11-12
DOIs
StatePublished - May 1 2007

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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