本研究之目的乃是以富燃料預混噴流火焰為基礎，並於外環流通入氧氣與氮氣的混合氣體以合成奈米碳結構。研究中，以同軸燃燒器的內管通入乙烯與空氣之預混氣體，外環通入氧氣/氮氣混合氣。實驗中固定內外環的流速在65 cm/s，改變內環預混氣體的乙烯濃度(10.5%、11.5%，當量比分別為 1.685、1.853)，以及外環氧氣濃度(無外環氣、15%、21%)。探討火焰型態、溫度場以及濃度場對於火焰合成奈米碳結構的影響。結果顯示，在適當的外環氧氣引入的情況下可以將火焰長度拉伸，火焰整體顏色變暗，延長了不飽和自由基在火焰中滯留的時間。溫度場的量測結果也顯示出在同一取樣高度，有適當氧氣的引入也將溫度維持在適合奈米碳結構生成的環境(約 970～1300 oC)。由SEM可觀察到在無外環氧氣加入時的碳結構產量明顯少於加入外環氧氣的環境，而在有外環氧氣加入的情況，15%的氧氣生成結果又較21%為佳。以TEM與拉曼光譜儀觀測發現在外環氧濃度15%，中心軸向位置在燃燒器出口50 mm處的奈米碳材料結構最佳。因此在本研究中可得到適當的氧氣引入可有效提升奈米碳結構生成之結論。

Synthesis of carbon nanostructures using partially premixed jet flames was investigated. In this study, both the flow speeds in both the inner and outer tubes were fixed at 65 cm/s, and ethylene/air mixture was used as premixed fuel. The influences of sampling position, gas temperature and oxygen concentration in the outer tube on the synthesis of carbon nanostructures were examined. The results showed that the increase in fuel concentration and oxygen concentration in outer tube leads to an increase of flame height and a wider range of yellow flame (sooty zone). Additionally, a quantity of carbon nano-onions were synthesized at Z = 50 ~ 60 mm for ethylene concentrations of 10.5% and 11.5% with oxygen concentrations of 15%; however, only a few carbon nanostructures were synthesized at Z = 70 mm because of the unfavorable high temperature (above 1400 oC). It has been verified that the key parameters affecting the formation and yield of CNOs were the carbon sources, and the heat source (suitable range around 970 ~ 1300 oC). Scanning electron microscopy (SEM) images confirmed the presence of spherical carbon nano-onions. With TEM and Raman spectroscopy, it was shown that the graphite structure of carbon nano-onions were better under the condition of 15% outer oxygen concentration.

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