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研究生： 陳文祥
Chen, Wen-Shiang
論文名稱： 以電紡絲技術製備一維氧化鋅奈米管
Electrospun One-Dimensional Zinc Oxide Nanotubes
指導教授： 郭昌恕
Kuo, Changshu
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2007
畢業學年度： 95
語文別： 英文
論文頁數： 91
中文關鍵詞： 奈米管 、電紡絲 、氧化鋅
外文關鍵詞： nanotubes, zinc oxide, electrospinning
相關次數： 點閱：91  下載：4 
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    • 本論文研究利用高分子輔助方式的電紡絲技術製備一維氧化鋅奈米管。　以化學溶解方式將鋅粉溶入聚丙烯酸高分子溶液之中，並把此不同配方的電紡絲溶液製備成鋅離子與高分子的混合奈米絲。　在富含羧基的奈米絲中，鋅離子均勻的分佈在絲的內部並形成奈米維度的聚集，以在將來形成氧化鋅晶體的成核點。　在鍛燒的過程中，鋅離子形成氧化鋅的時間較早於高分子熱裂解，使得氧化鋅形成奈米管結構。　氧化鋅奈米管的外徑可控制在100 nm至300 nm，並且擁有均勻的壁厚分佈在15 ~ 38 nm。　電紡絲溶液的配方、電紡絲法的參數和形成奈米管的機制都將在本論文中被研究與討論。

    One-dimensional zinc oxide nanotubes were fabricated via the polymer-assisted electrospinning technique. Chemically-dissolved metallic zinc powder in poly(acrylic acid) aqueous solutions were formulated to produce electrospun Zn2+/polyanion nanofibers. Homogeneously dispersed zinc ions in COOH-enriched nanofibers minimized the nano-scaled agglomerations which normally acted as the nucleation sites. Following calcination process encouraged the formation of zinc oxide from Zn2+ species prior to the thermal decomposition of polymer contents, resulting in the hollow structure of zinc oxide nanotubes. Outer diameters of zinc oxide nanotubes were controllable in the range of 100 nm to 300 nm with the uniform tube thickness of 15 ~ 38 nm. Electrospun formula, electrospinning conditions, and the formation mechanism of hollow structures were investigated and discussed in the present work.

    中文摘要 I Abstract II 誌謝 III Table of Contents IV List of Tables VII List of Illustrations VIII Chapter 1. Introduction 1 1.1. ZnO materials 1 1.2. Electrospinning 4 1.3. Electrospun inorganic materials 7 Chapter 2. Literature Reviews and Theory 10 2.1. Synthesis Techniques for ZnO Nanowires 10 A. Thermal evaporation 10 B. Chemical vapor deposition (CVD) 11 C. Hydrothermal growth method 11 D. Pulse laser deposition (PLD) 14 2.2. Growth Mechanisms 14 A. Vapor-Liquid-Solid (VLS) mechanism 14 B. Solution-Liquid-Solid (SLS) mechanism 17 C. Template growth mechanism 19 2.3. Research Motivation 21 Chapter 3. Experiments 22 3.1. Materials and Instruments 22 3.1.1. Materials 22 3.1.2. Instruments 22 3.2. Experiment process 24 3.2.1. PAA/zinc solution preparation 24 3.2.2. Fabrications of Zinc/PAA as-spun nanowires 26 3.2.3. Preparations of Zinc/PAA bulk samples 26 3.2.4. Calcination process to crystallize 1-D ZnO nanomaterials 27 3.3. Analysis instrument 30 3.3.1. Scanning Electron Microscopy (SEM): (Philips XL40 FE-SEM) 30 3.3.2. Transmission Electron Microscopy (TEM): (Hitachi HF-2000) 30 3.3.3 Fourier Transform Infrared Spectroscopy (FT-IR): (Jasco-200E) 31 3.3.4. Thermogravimetric Analyzer (TGA): (TA Instrument-Q500) 32 3.3.5. Differential Scanning Calorimetry (DSC): (TA Instrument-2920) 32 3.3.6. Glancing Incident Angle X-ray Diffractometer (GIA-XED): 33 3.3.7. UV-visible spectrometer (UV-vis): (Hitachi U-3010) 33 Chapter 4. Results and Discussions 34 4.1. As-spun PAA/Zinc nanowires 34 4.1.1. Fabricating different diameter PAA/Zinc as-spun nanowires 34 4.1.2 The interaction of PAA and Zinc in the as-spun nanowires 43 4.1.3. Thermal properties of the PAA/Zinc as-spun nanowires 45 4.1.3.1 The Glass transition temperature (Tg) of as-spun nanowires 45 4.1.3.2 The thermal decompose process of the as-spun nanowires 47 4.2. Calcined ZnO nanotubes 51 4.2.1. The formation of ZnO nanotubes 51 4.2.2. Fabricated different size ZnO nanotubes 58 4.3. Calcination process examined by FT-IR 65 4.4. Crystal structure and grain size of ZnO nanotubes 68 4.5. TEM analysis of ZnO polycrystalline nanotubes 75 4.6. Band gap energy of electrospun ZnO nanotubes 82 Chapter 5. Conclusions 84 Reference 85

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