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Purification of laser synthesized SWCNTs by different methods: a comparative study
Letlhogonolo Matlhoko1, Sreejarani K Pillai, Suprakas Sinha Ray
1National Centre for Nano-Structured Materials, Council for Scientific and Industrial Research, Pretoria-001, Republic of South Africa.
Journal of Nanoscience and Nanotechnology
|February 10, 2009
Summary
Different purification methods for single-walled carbon nanotubes (SWCNTs) yield varying purities from 48-78%. Prolonged calcination can selectively remove larger nanotubes, impacting material properties.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Single-walled carbon nanotubes (SWCNTs) are promising nanomaterials with diverse applications.
- Effective purification is crucial for realizing the full potential of SWCNTs.
- Laser-vaporization is a common synthesis method for SWCNTs.
Purpose of the Study:
- To compare the efficacy of various purification techniques for laser-vaporized SWCNTs.
- To assess the impact of different purification methods on SWCNT purity and characteristics.
Main Methods:
- Purification methods included gas-phase oxidation (calcination), liquid-phase oxidation (H2O2), hydrothermal treatment, and acid refluxing (HCl).
- Sample purity and characteristics were analyzed using Raman spectroscopy, Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), and Thermogravimetric Analysis (TGA).
- Multi-spot analyses were conducted to ensure sample homogeneity after purification.
Main Results:
- Purification processes resulted in SWCNT material purity ranging from 48% to 78%.
- Raman spectroscopy and TEM indicated that extended calcination selectively etches larger diameter SWCNTs.
- SEM and TGA revealed an increased density and improved oxidation resistance of SWCNTs post-purification.
Conclusions:
- The choice of purification method significantly influences the final purity and characteristics of SWCNTs.
- Calcination, while effective, can lead to preferential removal of larger diameter SWCNTs.
- Purified SWCNTs exhibit enhanced density and oxidation resistance, making them more suitable for various applications.
