Robust Forests of Vertically Aligned Carbon Nanotubes Chemically Assembled on Carbon Substrates

David Garrett, Benjamin Flavel, Joseph Shapter, Keith Baronian, Alison Downard

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    Forests of vertically aligned carbon nanotubes (VACNTs) have been chemically assembled on carbon surfaces. The structures show excellent stability over a wide potential range and are resistant to degradation from sonication in acid, base, and organic solvent. Acid-treated single-walled carbon nanotubes (SWCNTs) were assembled on amineterminated tether layers covalently attached, to pyrolyzed photoresist films. Tether layers were electrografted to the carbon substrate by reduction of the p-aminobenzenediazonium cation and oxidation of ethylenediamine. The aminemodified surfaces were incubated with cut SWCNTs in the presence of N,N'-dicyclohexylcarbodiimide (DCC), giving forests of vertically aligned carbon nanotubes (VACNTs). The SWCNT assemblies were characterized by scanning electron microscopy, atomic force microscopy and electrochemistry. Under conditions where the tether layers slow electron transfer between solution-based redox probes and the underlying electrode, the assembly of VACNTs on the tether layer dramatically increases the electron-transfer rate at the surface. The grafting procedure, and hence the preparation of VACNTs, is applicable to a wide range of materials including metals and semiconductors.

    Original languageEnglish
    Pages (from-to)1848-1854
    Number of pages7
    JournalLangmuir
    Volume26
    Issue number3
    DOIs
    Publication statusPublished - 2 Feb 2010

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