ZnO Nanosturctures:synthesis, characterization and applications

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研究生：	邱心怡 Chiu, Hsin-Yi
論文名稱：	ZnO Nanosturctures:synthesis, characterization and applications 氧化鋅奈米結構之製備,特性分析及其應用發展
指導教授：	嚴大任 Yen, Ta-Jen 金重勳 Chin, Tsung-Shune
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	96
中文關鍵詞：	氧化鋅、奈米結構、奈米粒子、奈米線、奈米柱
外文關鍵詞：	ZnO, nanostuctures, nanoparticles, nanowires, nanorods
相關次數：	點閱：1 下載：0
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Zero-dimensional and one-dimensional ZnO nanostructures were fabricated in this research. ZnO nanoparticles synthesized at different temperatures (55 °C, 58 °C and 62 °C) result in different particle size (11 nm, 22 nm and 36 nm for samples synthesized at 55 °C, 58 °C and 62 °C, respectively) and perform different emission colors under UV excitation. According to the particle size analysis, PL spectra and UV-Visible spectra, larger size ZnO nanoparticles have emission and absorbance wavelengths toward red shifted. Time course PL spectra of ZnO nanoparticles demonstrates the stability of ZnO nanoparticles in ethanol solution is only 9 days after synthesized. Capping a PEG polymer outside ZnO nanoparticle core not only makes ZnO nanoparticles dissolved in water, but also successfully stabilized its PL property to further 22 days. Several sets of growing parameters for growing ZnO nanowires by VLS process demonstrated the growing conditions in our furnace system. The factors that would affect the morphology of as-grown ZnO nanowires were studied. Synthesis of ZnO nanorods by aqueous chemical growth method was successfully achieved. The solubility test result of ZnO nanorods demonstrated in this research is diverse from the one which was reported in a published paper.
The purpose of this thesis is to synthesize, characterize and study the potential applications of ZnO nanostructures.

Chatper 1    Introduction    1
1-1    Introduction1    1
1-2    Motivation    2
Chatper 2    Literatures Review    4
2-1    Nanoscience and Nanotechnology    4
2-2    Nanostructures    5
2-2-1    Approaches to Fabricate Nanomaterials    6
2-2-2    Self-assembly    7
2-3    Properties of Nanostructures    9
2-3-1    Quantum Confinement    9
2-3-2    Optical Properties    10
2-3-3    Surface Effect    12
2-4    Zinc Oxide (ZnO)    13
2-4-1    Crystal and Surface Structure of ZnO1    14
2-4-2    Typical Growth Structures of ZnO1    16
2-5    Properties of ZnO Nanostructures    17
2-5-1    Field Emission Properties    18
2-5-2    Luminescence Properties    19
2-6    ZnO Nanoparticles    22
2-7    ZnO Nanowires and Nanorods    23
2-7-1    Vapor-Liquid-Solid Growth Mechanism    24
2-7-2    Aqueous Chemical Growth Mechanism    27
Chatper 3    Experimental Procedures    29
3-1    Synthesis of ZnO Nanoparticles    29
3-1-1    Synthesis of ZnO Nanoparticles    29
3-1-2    Removing Solvent by Freeze Dryer Machine    29
3-1-3    Synthesis of ZnO-PEG Nanoparticles    30
3-2    Growth of ZnO Nanowires by Furnace System    30
3-2-1    E-gun Deposition of Au Catalyst    30
3-2-2    Growth of ZnO Nanowires    31
3-3    Fabrication of ZnO Nanorods by Aqueous Chemical Method   32
3-3-1    Preparation of Substrate    32
3-3-2    Fabrication of ZnO Nanorods    33
3-4    Photoluminescence (PL) Analysis    33
3-5    UV-Visible Absorption Spectrum Analysis    34
3-6    Fourier Transform Infrared (FTIR) Spectroscopy Analysis    34
3-7    Particle Size Analysis    35
3-8    Scanning Electron Microscopy (SEM) Observation    36
3-9    Transmission Electron Microscopy (TEM) Observation    37
3-10    X-Ray Diffractometry (XRD) Analysis    37
3-11    Cytotoxicity test --- MTT Assay    38
3-12    ICP Analysis    39
Chatper 4    Results and Discussion    40
4-1    Photoluminescence ZnO Nanoparticles    40
4-1-1    Size Dependence    40
4-1-2    Photoluminescence Mechanism of ZnO Nanoparticles    45
4-1-3    Stability of ZnO Nanoparticles in Ethanol Solution    47
4-1-4    Evaluation of Biological Application    50
4-2    ZnO Nanoparticles Capped with PEG Polymer    54
4-2-1    Core-Shell Structure    55
4-2-2    Optical Properties    58
4-2-3    Potential Applications    62
4-3    ZnO Nanowires fabricated by Vapor-Liquid-Solid (VLS) Process    70
4-4    ZnO Nanorods synthesized by Aqueous Chemical Method    80
4-5    Potential applications of one-dimensional ZnO nanostructures    86
Chatper 5    Conclusions    88
Chatper 6    References    90

                                

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