| Summary: | 碩士 === 國立交通大學 === 應用化學系所 === 92 === The thesis are divided into three parts. In the first part, a simple method to prepare carbon nanofibers is described. Pitch powders were placed above anodic aluminum oxide membranes (AAO) and heated in a tube furnace at 573 K to soften the pitch so that it can flow into the AAO channels. Then, the temperature was raised to 973 K for further carbonization. The diameter of the nanofibers (60–200nm) can be controlled by the pore size of AAO. The graphene layers of the carbon nanofibers were perpendicular (orthogonal) to the fiber axis. The d–spacing of the graphene layers was estimated to be 0.39 nm.
In the second part, acetylene was decomposed inside the AAO channels to form carbon nanotubes at 1073 K. The CNT diameter varied with the diameter of the AAO channels. The graphene layers of carbon nanotubes were parallel to the tube axis, and the d–spacing of the graphene layers was estimated to be 0.38 nm.
In the third part, aluminum foils coated with sodium or sodium hydride was served as substrates, and acetylene was used as the carbon source. The reaction was kept at 623 K for 1h to grow one-dimensional carbon structures, such as rods with diameters of several micrometers and wires with diameters of tens to hundreds nanometers. All these products were amorphous.
|
|---|
