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Optimization of the purification procedure for single-walled carbon nanotubes

Optimization of the purification procedure for single-walled carbon nanotubes. By: Steven Wehmeyer Supervisor: Dr. Ajay Malshe Summer REU. Acknowledgements. Mechanical Engineering Department Colleagues in MMRL Financial Support from ONR

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Optimization of the purification procedure for single-walled carbon nanotubes

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  1. Optimization of the purification procedure for single-walled carbon nanotubes By: Steven Wehmeyer Supervisor: Dr. Ajay Malshe Summer REU

  2. Acknowledgements • Mechanical Engineering Department • Colleagues in MMRL • Financial Support from ONR • Dr. Malshe, Dr. Demytro, Dr. Benamara, Ranjith John.

  3. Applications • Electronics • Transistors • Cell phones • Computers • Biomedical • Cancer treatment • Ballistic • Body armor

  4. Importance of Carbon Nanotubes • Amazing properties • Thermal conductivity 6600 W/m-K • 2-3 times higher than diamond • Elastic Modulus 1-5 TPa • 3-4 times higher than diamond • Steel ~ .2 TPa • Electrical conductivity 10^4 S/cm • Gold 4.5x10^5 S/cm • Need to be pure to take full advantage of properties

  5. Synthesis • High Pressure catalytic decomposition of carbon monoxide (HIPCO) • Arc discharge • Laser ablation • CVD Synthesis (HIPCO)

  6. General purification • Raw material • High Pressure catalytic decomposition of carbon monoxide (HIPCO) from Unidym • Elicarb from Swan Chemical Inc. • Oxidize • Heat • Acid reflux • Hydrochloric Acid (HCl) • Purified SWNT • Characterize • Transmission Electron Microscope • Thermogravimetric Analysis • Raman Spectroscopy • Time= 3-4 days

  7. Method of Purification Used • Combine oxidation and acid reflux3 • H2O2 for oxidizing and HCl for acid reflux • Different concentrations • Fenton’s reagent • Combine with carbon nanotubes and heat mixture (90-110°C) for eight hours to accelerate processes • Vacuum Filtration • Heat to remove moisture • Characterize • TEM, TGA, Raman Spectroscopy • Time= 1 day

  8. Design of Experiment

  9. Results Iron Dissolution Vacuum Filtration

  10. Characterization - TEM P7 P8

  11. Characterization • TGA • Analysis will occur Tuesday through Friday at UALR • Looking for % wt purity. Burns sample and iron is left. Percent purity can then be obtained. • Raman Spectroscopy • Light scattering Technique. Uses laser to excite phonons and shift their energy level. These Raman shifts can be used to determine information about the carbon nanotubes. Looking for diameter and length of nanotubes.

  12. Conclusions • Carbon nanotubes were purified as indicated by iron dissolution • Percent pure not known yet • TEM images have shown that no big impurities exist in samples • Process works • Further work may be needed to optimize further • Further results and conclusions will be known after analyzing samples at UALR

  13. References • Benamara, Mourad. TEM images. • Unalan, Husnu Emrah.  “Single walled carbon nanotube thin films: Properties and applications”  Diss. Rutgers The State University of New Jersey, New Brunswick, 2006. Dissertations & Theses: Full Text. ProQuest. 28 May. 2009 • Wang, Yuhuang, Hongwei Shan, Robert H. Hauge, Matteo Pasquali, and Richard E. Smalley, “A highly selective, one-pot purification method for single-walled carbon nanotubes” The Journal of Physical Chemistry B 111.6 (24 January 2007): 1249-1252

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