Abstract
This thesis is devoted to probe into the influences of the intertube interactions or intertube junctions on the physical properties of SWCNT mat, such as thermal properties, electronic transporting properties, and mechanical properties. This thesis is divided into few parts: In the chapter 1, an introduction to this thesis is given. In the chapter 2, literature review and experiment method are shown in this chapter. In the chapter 3, we use First Principe Density Function Theory to simulate the thermal property on carbon nanotube. SWCNTs packed into bundle exhibit an increase in tube rigidity and up-shift of phonon frequency by intertube force. In the chapter 4, experiments are carried out to show how thermal conductivity is influenced by internanotube junctions. In the chapter 5, experiments are performed to demonstrate the effects of ion gas adsorption, migration and desorption on carbon nanotubes. First Principe DFT calculations are given to explain the results. It is shown that the adsorptions at internanotube junctions play an important role in whole resistance of SWCNT mat. In the chapter 6, Corona discharge is used as a novel way to produce carbon nanotubes, nanofibers, graphene and porous carbon structure. In the chapter 7, Corona discharge is used as a new method to produce graphene and First Principe DFT calculations have been carried out to evaluate the graphene property.