Production, processing and assembly of carbon nanotubes Public Deposited

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Last Modified
  • March 21, 2019
Creator
  • Geng, Huaizhi
    • Affiliation: College of Arts and Sciences, Department of Applied Physical Sciences, Materials Science Graduate Program
Abstract
  • This dissertation reports the development of a method to achieve continuous production of carbon nanotubes. The as produced carbon nanotubes were purified and further processed to tune their properties. Then dielectrophoresis as a versatile technique was used to manipulate and assemble carbon nanotubes into functional structures. In the processing part, purified carbon nanotubes are treated with strong acid then annealed at different temperatures. Combined TEM and NMR studies show that tips of SWNTs in bulk quantities can be uniformly opened by oxidation and closed by vacuum annealing at a surprisingly low temperature. The results provide a guideline on how the SWNTs should be processed for potential energy storage applications. In the assembly part, first, the results of a systematic study on the interactions of CNTs suspended in media of various viscosities and ionic conductivities with an AC field of different frequencies were reported. Then the feasibility of utilizing the dielectrophoresis for controlled assembling of functional CNT structures was explored. Finally, the automated process of assembling CNT fibrils unto sharp probes was realized and a precise control over the process was especially studied.
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  • In Copyright
Advisor
  • Zhou, Otto
Degree granting institution
  • University of North Carolina at Chapel Hill
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  • Open access
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