Characterization And Application Of Carbon Nanotube Supported Nanoparticles And Carbon Nanotube/Polymer Composites

Carbon nanotubes has become one of the focus of current researches due to its unique properties. Composites based on carbon nanotubes have broad application in many areas. Using simple preparations and treatments, this thesis synthesized several carbon nanotubes supported nanoparticles and carbon nanotubes/high density polyethylene composites with special structure and functions. Many modern analysis methods were used to characterize the microstructure of the products, such as TEM,XRD,EDS,SAED,HREM,EFTEM,HAADF. Their properties on catalysis, electromagnetism and tribology were explored at the same time.Electroless deposition and impregnation were used to prepare carbon nanotubes supported Ni-Co, Sn-Pd bimetallic and oxidated nanoparticles. Nanoparticles with special core-shell structure were obtained by proper anneal treatments. The formation mechanism of different core-shell nanoparticles was discussed through microstructure characterization, and this provides useful experiences on the controllable synthesis and further application of these nanoparticles with special structure.Carbon nanotubes supported Ni-based nanoparticles were preparation and used as catalysts on hydrogenation and dehydrogenation reactions. The hydrogen storage results of hydrogen slurry mixed with toluene and this composite were studied and the effect on hydrogen storage performances by different synthesis conditions was researched. This composite was used in the catalysis reaction of dehydrogenation of cyclohexane. Comparing with the normal Raney nickel catalyst, the dehydrogenation efficiency of this composite is higher. This result has not been reported by now. It opens up a new way for the application of carbon nanotubes supported nanoparticle on new energy area.Fe-based nanoparticle supported on carbon nanotubes were synthesis and their structure and morphology were changed by different anneal treatments. The microstructure and magnetic properties of carbon nanotubes supported Fe oxides and carbides were studied. It shows that different anneal treatment can be used to control the synthesis of Fe oxides and Fe carbides, their magnetic performance can also be changed.Simple blend method was used to prepare carbon nanotubes/high density polyethylene. The distribution of carbon nanotubes in polymer matrix was characterized and the electric performances and tribological properties were studied. The results showed that carbon nanotubes filled high density polyethylene has much lower percolation threshold than carbon black filled high density polyethylene. The electric properties of this composite exhibited different temperature dependence comparing with other electric fillings. This is due to the unique structure and properties of carbon nanotubes. The addition of carbon nanotubes would also enhance the wear resistance of the composites...