Industrial compatible re-growth of vertically aligned multiwall carbon nanotubes by ultrafast pure oxygen purification process

Ian Y.Y. Bu, Kai Hou, Daniel Southcott Engstrøm

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Reproducible high-yield purification process of multiwalled carbon nanotubes (CNTs) was developed by thermal annealing in ultrapure oxygen. The optimized condition involves thermal annealing via a PID controlled heater in high purity oxygen at temperature of 450°C for 180s, which burns out amorphous carbon and reactivate nickel catalyst. Controlling of the purification temperature is important for high yield CNTs, as excessive high annealing temperature results in deformation of the CNTs. Unlike hazardous wet purification treatments, purified CNTs remained vertically aligned and offer the possibility of tailored CNTs length through layer-by-layer process. The purification process is glass compatible and can be adapted to industrial synthesis of CNTs.
    Original languageEnglish
    JournalDiamond and Related Materials
    Volume20
    Issue number5-6
    Pages (from-to)746-751
    ISSN0925-9635
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Ultrafast
    • Carbon nanotubes.
    • Purification
    • Re-growth

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