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研究生：	歐孟融 Ou, Meng-Jung
論文名稱：	氧化鋅電紡絲的製備與分析 Fabrication and Characterization of Electrospun Zinc Oxide Nanofibers
指導教授：	郭昌恕 Kuo, Chang-Shu
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：	2012
畢業學年度：	100
語文別：	英文
論文頁數：	83
中文關鍵詞：	電紡絲、氧化鋅、黏著性
外文關鍵詞：	electrospinning, zinc oxide, nanofiber, adhesion
相關次數：	點閱：162 下載：0
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一維氧化鋅絲可藉由電紡絲技術製備。在水溶液中，鋅粉末與聚丙烯酸高分子反應。鋅氧化成鋅離子，並與聚丙烯酸高分子螯合。鋅離子與聚丙烯酸高分子水溶液拿來當作電紡絲的前驅物，製作出鋅離子混合聚丙烯酸高分子的一維電紡絲。經過鍛燒後高分子被燃燒成二氧化碳與水氣消散，留下氧化鋅。鋅離子與聚丙烯酸高分子水溶液的濃度、電紡絲工作距離及前驅物進料速率，可以改變鋅離子混合聚丙烯酸高分子以及純氧化鋅電紡絲的直徑。氧化鋅電紡絲的直徑在一百奈米這個量級，恰好有很廣泛的應用。氧化鋅電紡絲與基板間的黏著性也進行研究。氧化鋅電紡絲與基板間增加一層預製層，並且在鍛燒前進行熱壓，黏著性有改善。紫外-可見漫反射光譜可測量氧化鋅能隙。X光繞射圖譜顯示氧化鋅電紡絲是纖維鋅礦結構。從X光繞射圖譜氧化鋅電紡絲的平均晶粒尺寸可藉由謝樂爾公式計算出。

One-dimensional zinc oxide nanofibers was synthesized via electrospinning method. Zinc powder react with poly(acrylic acid) (PAA) and forms Zn2+ ions which chelate with PAA carboxylic group in an aqueous solvent. The aqueous solution of Zn2+/PAA is utilized as the electrospinning solvent and Zn2+/PAA fibers are produced. After calcination process, the polymer burned into CO2(g) and H2O(g) and only zinc oxide remained. Concentration of Zn2+ and PAA, the electrospinning working distance, and the feeding rate alter the diameters of as-spun and calcined fibers. Diameter of zinc oxide nanofibers is at about 100 nm. The adhesion between ZnO fibers and substrate were also investigated. With additional prefabricated layer between electrospun ZnO fibers and substrate and the hot-processing process prior to the calcination, the adhesion of ZnO fibers was successfully improved. Band gap of ZnO nanofibers was obtained via UV-vis diffusive reflectance spectra. X-ray diffraction (XRD) spectra showed that the structure of ZnO fibers is wurtzite. The grain size of ZnO fibers can be measured from XRD spectra via Scherrer formula.

誌謝.......................................................i 
中文摘要...................................................ii 
Abstract.................................................iii
Table of contents.........................................iv 
List of tables............................................vi 
List of illustrations....................................vii 
Chapter 1. Introduction....................................1 
1 Synthetic Approaches for 1-D ZnO Nanomaterials.........1 
1.1 Vapor-Liquid-Solid mechanism.........................2 
1.2 Vapor-Solid mechanism................................4 
1.3 Pulsed laser deposition..............................6 
1.4 Electrodeposition....................................6 
1.5 Sol-gel method.......................................8 
1.6 Hydrothermal method..................................8 
2 Electrospinning.......................................10 
2.1 Electrospinning theory..............................10 
2.2 Precursor...........................................11 
2.3 Multi jet electrospinning and mixed electrospinning.13 
2.4 Coaxial and bicomponent-jet electrospinning.........14 
2.5 Fiber alignment.....................................16 
2.6 Electrospun inorganic materials.....................19 
3 Applications of Electrospun ZnO Nanofibers............24 
3.1 Sensors.............................................24 
3.2 UV detectors........................................27 
3.3 Dye-sensitized solar cell...........................28 
3.4 Antibacteria........................................29 
3.5 Field effect transistor.............................30 
4 Research Motivation...................................30 
Chapter 2. Experiments....................................31 
1 Materials and Instruments.............................31 
1.1 Materials...........................................31 
1.2 Instruments.........................................32 
2 Experiment Process....................................33 
2.1 Zn2+/PAA solution preparation.......................33 
2.2 Fabrications of Zinc/PAA as-spun nanowires..........34 
2.3 Calcination process to crystallize 1-D ZnO nanofibers................................................35
2.4 Fabrications of samples for adhesion measurement....36 
2.4.1 Fabrications of blocking layers...................36 
2.4.2 Fabrications of prefabricated layers..............37 
2.4.3 Hot pressing process..............................38 
3 Analysis Instrument...................................40 
3.1 Scanning electron microscopy (SEM):.................40 
3.2 Glancing incident angle X-ray diffractometer (GIA-XED):.....................................................40 
3.3 Ultraviolet-visible spectrometer (UV-vis): (Hitachi U-3010).....................................................42 
Chapter 3. Results and Discussions........................43 
1 The Fiber Diameters and Fiber Mass....................43 
1.1 Diameters of as-spun and calcined nanofibers........43 
1.2 Effect of parameters on fiber diameters.............47 
1.3 The fiber mass......................................49 
2 The Adhesion of ZnO Nanofibers........................51 
2.1 Controlling the thickness of ZnO nanofibers’ layer..51 
2.2 Temperature effect on hot pressing process..........52 
2.3 Effect of the thickness of prefabricated layer......55 
2.4 Discussion on the principle of prefabricated layer..57 
3 Spectra of Nanofibers.................................57 
3.1 The UV-vis and UV-vis diffusive reflectance spectra of as-spun Zn2+/PAA and calcined ZnO fibers..................57 
3.2 Bandgap.............................................62 
4 X-Ray Diffraction Spectra.............................63 
4.1 Structure...........................................63 
4.2 Grain size..........................................69 
Chapter 4. Conclusions....................................75 
Reference.................................................76

                                    

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校內：2017-09-04公開
校外：不公開電子論文尚未授權公開，紙本請查館藏目錄

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