臺灣博碩士論文加值系統

本文主要討論由TiCl4為原料，在室溫下進行水解與縮和反應，藉由實驗中添加不同莫耳數的鹼液以調整溶液的pH值，而合成出不同晶相之TiO2奈米微粒，並對其以不同氣氛及不同溫度之熱處理，利用X-ray繞射儀(X-Ray Diffraction)、冷場發射掃瞄電子顯微鏡(Field Emission Scanning Electron Microscope)、紫外—可見光譜儀(UV-visible spectrometer)以及螢光光譜儀(Photoluminescence spectrometer)量測其結晶性、表面型態以及光學性質之變化。
　　藉由不同氛圍及不同溫度熱處理，TiO2奈米粒子之結晶性及一次結晶粒徑受到實驗參數影響，在高真空缺氧環境下進行熱處理之TiO2奈米粒子產生一次結晶粒徑縮小之現象，而在充足氧氣的熱處理環境之下，TiO2奈米粒子一次結晶粒徑及結晶性則隨溫度上生而成長。光學方面，由吸收光譜得知，不同氛圍參數熱處理後，TiO2奈米粒子之間接能隙明顯受到影響而改變，高真空缺氧熱處理之TiO2奈米粒子間接能隙存在藍位移現象，而Rutile phase在高真空缺氧550℃熱處理環境下，其直接能隙明顯發生藍位移至3.31 eV。由放射光譜 可知缺氧處理後TiO2奈米粒子表面產生大量缺陷，而在氧離子缺陷能階處發生高強度的放射光，其波長約為465 nm與540 nm。

In this study, we tried to synthesize different phases TiO2 nanoparticle crystals by adjusting the pH value of the TiCl4 solution through the hydrolysis and condensation reaction at the room temperature, these products then treated with thermal process in different ambience and temperature. In order to measure variation of the crystalline property, surface morphology and optical properties of the different phases TiO2 nanoparticles, these particles were finally analyzed by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), utraviolet-visible spectrometer (UV) and photoluminescence spectrometer (PL).
From XRD analysis, the results appeared that the first order crystal diameter of these TiO2 nanoparticles were affected by the variation of the experiment parameter, the crystal diameter increased with the increasing of the oxygen concentration and the annealing temperature but decreased at 450℃ high vacuum ambient environment. In optical properties, we could obviously find that the indirect band gap varied with the different ambiences from the absorption spectrum, it existed a blue shift phenomenon at the high vacuum thermal process environment. In the other hand, we could also find that there was a obviously blue shift on the direct band gap of the 550℃ high vacuum thermal process one. Eventually, the emission spectrum revealed that there existed a great quantities of oxygen vacancies of particles at the high vacuum condition, the vacancies had a strong emission light at the 465nm and 540nm wavelength.

誌謝 i
中文摘要 ii
Abstract iii
目錄 iv
圖目錄 v
第一章、緒論 1
第二章、文獻回顧及理論分析 3
2.1 二氧化鈦(Titanium dioxide, TiO2) 3
2.3 二氧化鈦之光學性質 12
2.3 溶膠—凝膠法(Sol-Gel) 16
第三章、實驗方法與步驟 18
3.1 X光繞射分析(X-Ray Diffraction, XRD) 18
3.2冷場發射掃瞄式電子顯微鏡分析(Field Emission Scanning Electron Microscopy, FESEM Analysis) 19
3. 3紫外光—可見光譜分析(UV-vis Spectrum Analysis) 19
3.4螢光光譜分析(Photoluminescence Spectrum Analysis) 19
第四章、實驗結果與討論 21
第五章、結論與未來工作 25
參考文獻 27

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