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研究生： 阮氏黃豔
Diem, Nguyen Thi Hoang
論文名稱： 水熱法製備鉻摻雜二氧化鈦奈米柱及其光觸媒之應用
Hydrothermal Synthesis of Cr-Doped TiO2 nanorods for the Application of Photocatalyst
指導教授： 張高碩
Chang, Kao-Shuo
共同指導教授: 廖峻德
Liao, Jiunn-Der
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： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 80
中文關鍵詞： 二氧化鈦奈米柱 、水熱法 、光催化 、鉻摻雜
外文關鍵詞： TiO2, Hydrothermal, Photocatalyst, Cr doping
相關次數： 點閱：82  下載：3 
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    • 本研究論文乃利用水熱法成長金紅石相的二氧化鈦奈米柱於矽基板上。藉由改變前驅物的濃度、製程溫度、製程的時間及pH值來改變奈米柱的結構。水熱法成長參數為0.04莫耳濃度的四丁氧基鈦於160 °C的溫度三個小時在二氧化鈦晶種層上為最佳的參數，而晶種層乃由溶液溶膠法製德後再經700 °C一小時的燒結製得。因二氧化鈦能隙為3.2電子伏特，為紫外光波段，故在其應用上受到限制。藉由摻雜不同濃度的鉻來改變二氧化鈦奈米柱之能隙，並利用X光繞射儀、二次電子顯微鏡、穿透式電子顯微鏡、拉曼及紫外光-可見光光譜儀來分析不同濃度摻雜的二氧化鈦奈米柱之結晶結構、表面形貌、光學性質等特性。最後在紫外光跟可見光的照射下，利用甲基藍做為反應基準物來測量鉻摻雜的二氧化鈦之光觸媒活性，並發現摻雜7%莫耳濃度的鉻能達到最佳的改善效果。

    In this study, the rutile TiO2 nanorods (TNRs) were grown on a TiO2 seed layer coated Si substrate by a hydrothermal technique. We have studied varied parameters, including precursor concentration, temperature, reaction time and pH in the hydrothermal reaction to see how they affect the TiO2 nanorods growth. We found the best condition for hydrothermal growth is 0.04M TBOT at 160 °C for 3 hrs on TiO2 seed layer which annealed at 700 °C for 1 hr.
    Due to a wide band gap (Eg ~ 3.3 eV) of TiO2, its application is limited in the UV range. In order to further extend its absorption of visible light, Cr-doped TiO2 nanorods were synthesized by a hydrothermal treatment. XRD, SEM, TEM, Raman, and UV-Vis were carried out to determine how different concentrations of Cr dopant affected crystallinity, structure, morphology, and optical properties of TiO2 nanorods. The photocatalytic activity of Cr-TiO2 was investigated using methylene blue as a targeted pollutant under both UV and visible light irradiation. We found that doping of Cr with suitable ratio (7% mol) can significantly improve the photocatalytic activity of TiO2 nanorod under a visible light.

    Content 摘要.....................................................I Abstract.................................................II Acknowledgements.........................................III Content..................................................V Figure content ..........................................VIII Table content ...........................................XII Chapter 1 Introduction...................................1 1.1.Background...........................................1 1.1.1. Energy and the environment........................1 1.1.2. Solar energy......................................2 1.1.3. TiO2 and solar energy.............................4 1.2. Crystal structure and properties of TiO2 ...........5 1.2.1. TiO2 vs. other materials as a photocatalyst ......7 1.2.2. Application of TiO2 ..............................9 1.2.3. Modification of TiO2 nanomaterials................15 1.2.4. TiO2 nanorods.....................................18 1.2.5. Synthesis method of 1D TiO2 nanorod ..............19 1.2.6. Research objectives ............................. 21 Chapter 2 Literature review..............................22 2.1. Introduction .......................................22 2.2. Overview of hydrothermal synthesis..................22 2.2.1. Fundamental chemistry ............................22 2.2.2. Hydrothermal synthesis of TiO2 nanorods...........25 Chapter 3 Experimental methods ..........................31 3.1. Materials ..........................................31 3.2. Experimental set up ................................31 3.2.1. Substrate preparation.............................31 3.2.2. TiO2 seed layer preparation.......................32 3.2.4. Chromium (Cr) ions doping ........................36 3.2.5. Photocatalytic study .............................36 3.3. Characterization....................................37 3.3.1. X-ray Diffraction (XRD)...........................38 3.3.3. Transmission Electron Microscopy (TEM) ...........40 3.3.4. UV-Vis Spectroscopy...............................41 Chapter 4 Results and discussion.........................43 4.1. Crystal structure of seed layer ....................43 4.2. Crystal structure and morphological characterization of TiO2 nanorods (TNRs).............................48 4.3. Effect of hydrothermal reaction time on TNRs growth.53 4.4. Effect of TBOT concentration in hydrothermal solution on the nanorods growth .............................56 4.5. Growth mechanism of TNRs............................58 4.6. Cr-Doped TiO2 nanorods..............................60 4.7. Optical property of TiO2 nanorods...................64 4.8. Photodegradation ability of Doped-Cr TiO2 nanorods..66 Chapter 5 Conclusions and Future work ...................72 5.1. Conclusions ........................................72 5.2. Future work ........................................73 References...............................................74

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