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Fabrication of graphitic carbon nanostructures and their electrochemical applications

  • Author / Creator
    Du, Rongbing
  • New methods to fabricate nanometer sized structures will be a major driving force in transforming nanoscience to nanotechnology. There are numerous examples of the incorporation of nanoscale structures or materials enhancing the functionality of a device. Graphitic carbon is a widely used material in electroanalysis due to a number of advantageous properties such as wide potential window, low cost, mechanical stability, and applicability to many common redox systems. In this thesis, the fabrication of nanometer sized graphitic carbon structures is described. These structures were fabricated by using a combination of electron-beam lithography (EBL) and pyrolysis. EBL allows for the precise control of shape, size and location of these carbon nanostructures. The structure and electrochemical reactivity of thin films of the pyrolyzed material is initially examined. The methodology to fabricate nanosized carbon structures and the structural and electrical characterization of the nanostructure is presented. The nanometer sized carbon structures fabricated in this work are being applied as nanoelectrodes. For nanoband structures, we observe a limiting current plateau which is characteristic of radial diffusion to cylindrical ultramicroelectrodes. Their voltammetric behaviour shows good agreement with classical theoretical predictions. Both carbon film and nanoband electrodes have been used as substrates for metal electrodeposition. The size and morphology of the deposited Au particles depends greatly on the substrate. On the nanoband electrodes, the Au particles exhibit a multi-branched or dendridic morphology. Their size and surface area are much larger than those electrodeposited on the carbon film electrode under the same conditions. The surface enhanced Raman spectroscopy (SERS) properties of the gold deposited on the nanobands was studied. A high enhancement in Raman intensity for a molecular layer on the nanoband supported gold is observed.

  • Subjects / Keywords
  • Graduation date
    2010-06
  • Type of Item
    Thesis
  • Degree
    Doctor of Philosophy
  • DOI
    https://doi.org/10.7939/R3H40W
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Doctoral
  • Department
    • Department of Chemistry
  • Supervisor / co-supervisor and their department(s)
    • McDermott, Mark (Chemistry)
  • Examining committee members and their departments
    • McCreery, Richard (Chemistry)
    • McCarley, Robin (Chemistry)
    • Buriak, Jillian (Chemistry)
    • Brett, Michael (Electrical & Computer Engineering)
    • Harrison, D. Jed (Chemistry)