| 研究生: |
張碧真 Chang, Pi-Chen |
|---|---|
| 論文名稱: |
利用電紡絲技術製備碳化矽奈米材料之研究 Fabrication and Characterization of Nano Silicon Carbide by Electrospinning |
| 指導教授: |
陳志勇
Chen, Chuh-Yung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
| 論文出版年: | 2012 |
| 畢業學年度: | 100 |
| 語文別: | 中文 |
| 論文頁數: | 74 |
| 中文關鍵詞: | 碳化矽 、聚丙烯腈 、靜電紡絲 |
| 外文關鍵詞: | Silicon Carbide, Poly acrylonitrile(PAN), Electrospinning |
| 相關次數: | 點閱:104 下載:1 |
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碳化矽(SiC)是一具有高化學穩定性、高硬度、高導熱性以及低熱膨脹係數的陶瓷半導體材料,製備出來的碳化矽材料尺寸範圍多在微米以上,很少有奈米SiC合成技術的報導。因此本研究以聚丙烯腈(polyacrylonitrile, PAN)高分子溶液導入不同含量的二氧化矽(Silicon dioxide, SiO2),利用電紡絲技術製備出不同碳矽比例的SiO2/PAN複合奈米纖維,再以1400oC高溫鍛燒,使SiO2與PAN形成的碳纖維反應成為碳化矽奈米材料。經由掃描式電子顯微鏡觀察發現紡製出來的SiO2/PAN奈米纖維其直徑介於250nm ~400nm,且SiO2粒子均勻分散在複合奈米纖維內;經過高溫鍛燒後的奈米纖維由傅立葉轉換紅外線光譜儀(FTIR)分析,在797cm-1位置Si-C的吸收峰強度卻大幅增強,表示碳纖維與SiO2反應形成SiC;由X射線繞射儀(XRD)分析圖在2θ值為35.7度、60.0度、71.8度處均可觀察到beta-SiC結晶的特徵繞射峰,證實成功製備出具有碳化矽材料的奈米纖維;由熱重分析儀(TGA) 顯示碳矽比例為15/1、10/1和5/1的SiC/Carbon複合纖維最後剩下的重量百分比分別為65wt%、80wt%及90wt%,知道隨著碳矽比例下降,所得到的SiC材料也較多;進一步以掃描式電子顯微鏡與穿透電子顯微鏡觀察到鍛燒後的奈米纖維會形成三種結構:奈米纖維、不規則纖維和鬚晶;由高解析度TEM與電子繞射分析可以發現有SiC奈米粒子被包裹在奈米纖維之中;不規則纖維與鬚晶則是由純SiC組成的。
In this study, an electrospinning process was used to fabricate silicon dioxide (SiO2)-embedded poly acrylonitrile (PAN) nanofibers. SiO2 nanoparticles were dispersed in the PAN before spinning. The SiC nano materials were made by economical Acheson method (carbothermal reduction). The carbothermal reduction of the stabilized SiO2/PAN fibers was carried out at 1400oC for 4 h in argon atmosphere with heating rate of 5oC/min to calcine SiC nano materials.
The surface morphologies and structures of the SiO2/PAN nanofibers were characterized by scanning electron microscopy (SEM). SEM observation showed that the average diameter of the SiO2/PAN nanofibers was between 250nm and 400nm, and the SiO2 nanoparticles were embedded in the PAN nanofibers. The X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) results explicitly show that SiC was produced during carbothermal reduction. The product of SiC materials were increased with decreasing C/Si mol ratios of the precursor solution. From SEM and transmission electron microscopy (TEM) results, there are many different SiC structures including SiC/Carbon nanofibers and whiskers. The SiC particles were embedded in the SiC/Carbon nanofibers.
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校內:2017-08-15公開