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    Preparation and Characterisation of Vertically Aligned Carbon Nanotubes

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    Author
    Xu, Rui
    Date
    2010
    Permanent Link
    http://hdl.handle.net/10092/4474
    Thesis Discipline
    Chemistry
    Degree Grantor
    University of Canterbury
    Degree Level
    Masters
    Degree Name
    Master of Science

    This thesis presents the preparation of vertically aligned carbon nanotubes using porous anodic alumina templates via thermal chemical vapour deposition. The characteristics of prepared carbon nanotubes in terms of tube diameter, length, density, uniformity and alignment were investigated.

    The formation of porous anodic alumina membranes was studied. In order to prepare well-ordered porous anodic alumina templates, three approaches towards anodization of aluminium were examined. Effects of Al surface morphology and anodization conditions on the formation of the porous anodic alumina membrane were investigated.

    Co catalyst was electrochemically deposited at the bottom of the pores of porous anodic alumina templates by applying an alternating current. Prior to the AC electrodeposition, the barrier layer at the base of the pores was thinned in order to facilitate the deposition process. The thinning effect of three barrier layer thinning approaches was examined. The effect of electrodeposition duration on the pore filling was investigated.

    Carbon nanotubes were grown using Co-loaded porous anodic alumina templates via thermal chemical vapour deposition of C₂H₄. Effects of the presence of the Co catalyst, the amount of Co deposited at the bottom of the pores and the presence of water vapour on the carbon nanotube growth were examined. The characteristics of the grown carbon nanotubes in terms of tube diameter, length, density, uniformity and alignment were investigated. Moreover, a post-treatment after the carbon nanotube growth was proposed in order to obtain vertically aligned carbon nanotubes.

    In addition, vertically aligned carbon nanotubes were grown on Si chips. Two methods were used to prepare a catalytic layer on the Si chips for carbon nanotube growth.

    Subjects
    Preparation
     
    Characterisation
     
    Vertically Aligned Carbon Nanotubes
    Collections
    • Science: Theses and Dissertations [3449]
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    https://canterbury.libguides.com/rights/theses

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