頁籤選單縮合
題 名 | Growth of Carbon Nanotubes and Vapor-Grown Carbon Fibers Using Chemical Vapor Deposition of Methane=利用甲烷之化學氣相沈積法製備奈米碳管及氣相成長碳纖維 |
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作 者 | 李元堯; 迫田章義; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 33:5 2002.09[民91.09] |
頁 次 | 頁483-489 |
分類號 | 460.02 |
關鍵詞 | 甲烷; 化學氣相沈積法; 奈米碳管; 碳纖維; Carbon nanotube; Vapor-grown carbon fiber; VGCF; Chemical vapor deposition; CVD; Scanning electron microscopy; SEM; Pyrolysis of methane; |
語 文 | 英文(English) |
中文摘要 | 此研究主要是利用化學氣相沈積法(CVD)使得甲烷在1100°C時裂解並生成奈米碳管及碳纖維(VGCF)。我們是利用500ml/min流速的混合氣體(含20%甲烷及80%氯氣)通入石英管的反應器內使氣體反應並沈積在含有鐵觸媒的陶瓷基材上。首先將0.5M的硫酸鐵水溶液經過乾燥、脫結晶水、成核作用製備氧化鐵觸媒。在經過10-40分鐘CVD的反應之後,直徑約10nm-100nm的奈米碳管及直徑約為數微米到10微米的碳纖維(VGCF)生成。我們也在實驗中發現許多不同形狀的奈米碳管及VGCF,包括圓柱型、螺旋型、環型及片狀的碳結構等。除此之外,若改變混合氣體的流動方向180度時,VGCFs將彎曲180度。因此我們認為氣體流動方向將會改變奈米碳管及VGCF的生成方向。 |
英文摘要 | Carbon nanotubes and vapor-grown carbon fibers (VGCFs) were fabricated by means of chemical vapor deposition (CVD) of methane at 1100℃. The experiments were conducted by introducing a mixture of 20% methane and 80% nitrogen at a total flow rate of 500 ml/min into a tubular quartz reactor containing a ceramic substrate coated with iron oxide particles as catalysts for the growth of nanotubes. Iron oxide particles were formed by drying/dehydration of 0.5 M ferric sulfate aqueous solution, followed by nucleation of ferric sulfate. After a deposition time of 10 to 40 minutes, carbon nanotubes, with diameters of about 10 to 100 nm, and VGCFs, with diameters of a few to 10βm, formed. Many types of nanotubes and VGCFs, including cylindrical, spiral, ring-like and sheet-like types, were found in our study. In addition, the direction of the gas flow was reversed about halfway through the deposition process. It was discovered that the VGCFs bent 180 degrees, suggesting that the orientation of the growing nanotubes and VGCFs followed the direction of the gas flow. |
本系統中英文摘要資訊取自各篇刊載內容。