| Summary: | 碩士 === 國防大學理工學院 === 材料科學碩士班 === 98 === The synthesis of carbon nanocoils (CNCs) and carbon nano-products using thermal chemical vapor deposition (TCVD) with C2H2/H2 as gas sources was studied in this thesis. The results of this thesis comprise three main sections. The first part, the compares the CNCs growth on silicon wafers with different palladium (Pd) nano-catalysts prepared with chemical displacement or reduced by styrene-N-isopropylacrylamide oligomer (St-co-NIPAAm). The influence of process parameters for Pd catalysts preparation, with both methods, on the CNC growth has been evaluated. These parameters have been optimized by means of SEM observation of the CNC morphology. The mechanism of the CNC growth has been also inferred from the results.
In the second part, the carbonaceous nano-products, namely, CNCs and carbon nano-rods, grown on different substrates such as anodized aluminum oxide (AAO), bulk aluminum oxide (Al2O3), nano-scale Al2O3 particles, and nano-scale Fe3O4 particles, which were used to carry the nano Pd catalysts, have been studied. The morphology and types of carbonaceous nano-products were analyzed to evaluate the influence of different substrates on the CNC growth. The possibility of CNC mass production utilizing a suitable substrate was also evaluated.
In the last section, field emission filaments were fabricated with direct growth of CNCs using our nano Pd catalysts on nickel and stainless steel wires. Their emission properties were evaluated. The result indicates that ,with a sand-blasted pretreatment, the CNCs grown on stainless wires have good field emission properties which are good for the application on field emission illumination.
|
|---|
