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Related Experiment Videos

Purification process for vertically aligned carbon nanofibers.

Cattien V Nguyen1, Lance Delziet, Kristopher Matthews

  • 1NASA Ames Research Center, Moffett Field, California, USA.

Journal of Nanoscience and Nanotechnology
|August 12, 2003
PubMed
Summary

This study introduces a straightforward method to remove iron catalyst particles from vertically aligned carbon nanofibers. This purification process ensures the integrity of the carbon nanotube structure for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Vertically aligned carbon nanofibers (VACNFs) are crucial for sensor and electrode applications.
  • Plasma-enhanced chemical vapor deposition (PECVD) is a common method for producing VACNFs.
  • Iron catalyst particles at the tip of VACNFs can impede performance and require removal.

Purpose of the Study:

  • To develop a simple and effective purification process for removing iron catalyst particles from VACNFs.
  • To assess the impact of the purification process on the structural integrity of the carbon nanofibers.

Main Methods:

  • VACNFs produced via PECVD with tip-bound iron catalyst particles were subjected to a two-step purification.
  • Step 1: Thermal oxidation in air at 200-400°C to swell iron particles via iron oxide formation.

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  • Step 2: Treatment with diluted acid (12% HCl) for complete iron oxide particle removal.

    • Main Results:

    • The purification process efficiently removed all iron catalyst particles from the VACNFs.
    • Electron microscopy and Raman spectroscopy confirmed the absence of iron particles after purification.
    • No damage to the graphitic structure of the carbon nanofibers was observed.

    Conclusions:

    • A facile thermal oxidation and acid-wash method effectively purifies iron-catalyzed VACNFs.
    • This process preserves the structural integrity of carbon nanofibers, making them suitable for demanding applications.
    • The developed purification technique enhances the utility of VACNFs in nanotechnology and materials science.