研究生: |
陳冠喬 Kuan-Chiao Chen |
---|---|
論文名稱: |
藉表面粗糙度輔助成長氧化鋅奈米線及其發光特性研究 Surface Roughness Assisted Growth and Luminescent Properties of Zinc Oxide Nanowires |
指導教授: |
林鶴南
Heh-Nan Lin |
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: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 55 |
中文關鍵詞: | Surface Roughness 、Zinc Oxide Nanowires 、Photoluminescent |
相關次數: | 點閱:2 下載:0 |
分享至: |
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本研究以熱蒸鍍法成功地在氧化鋁、矽基板以及玻璃上大面積垂直成長氧化鋅奈米線,此製程無需添加金屬催化劑或使用任何晶種層,而是藉著增加基板表面粗糙度並結合汽-固成長機制來合成氧化鋅奈米線。我們使用鋼針筆輕劃、砂紙機械研磨以及化學蝕刻等簡單方式來增加基板表面粗糙度。利用增加表面粗糙度的方法,大量提供氧化鋅分子異質成核的位置,再配合適當的成長參數,得以合成具有垂直形貌的氧化鋅奈米線。本研究和一般的合成方法相比較,具有製程簡單,無催化劑帶來的污染,不需另外鍍上晶種層且適合在多種基板上成長等優點。另外利用螢光光譜儀觀察PL光譜,在紫外光波段(384 nm)、藍綠光波段(481 nm)及綠光波段(521 nm)有發光現象,並藉著在大氣壓下退火,使藍綠光波段的強度下降,間接證明造成此波段的原因為氧缺陷所致。
This study reports the successful growth of large-scale vertically aligned ZnO nanowires on sapphire, silicon, and glass substrate by direct thermal evaporation. In this processing, neither adding metal catalysts nor the usage of seed layers, we fabricate ZnO nanowires via a surface roughness assisted vapor-solid mechanism. Simple processing steps including steel needle scratching, mechanical polishing with sand-paper, and chemical etching have been utilized to improve surface roughness of substrates. By this method, the heterogeneous nucleation sites have been provided largely; as the growth parameters are well-controlled, the synthesis of vertically aligned ZnO nanowires can be achieved. Compared with other methods, this study has some advantages like simple processing, no catalyst contamination, no seed-layer usage and suitable for various types of substrates. On the other hand, the luminescence spectrometer was applied to measure the PL properties of ZnO nanowires. Three obvious peaks in UV (384 nm), blue-green (481 nm), and green (521 nm) region have been observed. Furthermore, as the nanowires have been annealed in atmosphere, the intensity of blue-green peak dropped, which can be the circumstantial evidence of oxygen vancancies.
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