Synthesis And Characterization Of Micro-Scale Carbon Materials

The point of this dissertation is to synthesize the new structure of micro-scale carbon materials and study their formation mechanism. Three synthetic routes were employed to synthesize carbon materials, such as a reductive and catalytic pyrolysis route, a single-source precursor way, and a solvothermal route. Various carbon materials were successfully synthesized, including core-shell nanostructure of carbon, helically coiled carbon nanotubes, olivary carbon microspheres and amorphous carbon nanotubes. At the same time, the formation mechanisms were also studied. The experiment work can be summarized as follow:1. A reductive and catalytic pyrolysis method was developed to prepare carbon materials. By controlling the experimental parameters, the novel structure carbon materials, such as core-shell nanostructure of carbon, olivary carbon microspheres and helically coiled carbon nanotubes, were successfully synthesized. The roles of the metals as reductant and the organic materials as the carbon source were investigated in detail. The results showed that: (a) The drastically exothermal redox reaction between metallic magnesium and ethyl ether played an key role in the formation of the core-shell nanostructure carbon. (b) The polyreaction of the acetone with enol form was important to form the olivary carbon microspheres. The polyreaction was initiated by the free radical produced by the redox reaction between metallic zinc and acetone. (c) Zinc oxide nanoparticles acted as the catalyst in the formation of helically coiled carbon nanotubes, which were produced by the redox reaction between metallic zinc and ethyl ether. And the carbon dimer played an important role in the formation of helically coiled carbon nanotubes, which was produced by pyrolysis of ethyl ether.2. Developed the single-source precursor route. In experiment, ferrocene acted as both catalysts and carbon sources. The experimental result shows oxygen plays a...