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研究生： 黃郁傑
Huang, Yu-Jie
論文名稱： 銅、鉬共摻雜二氧化鈦之製備與分析
Preparation and characterization of Molybdenum and Copper co-doped Titanium Oxide
指導教授： 蘇雲良
Soo, Yun-Liang
口試委員: 詹丁山
Chan, Ting-Shan
翁世璋
Weng, Shih-Chang
張石麟
Chang, Shih-Lin
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2018
畢業學年度： 107
語文別： 中文
論文頁數： 45
中文關鍵詞： 溶膠凝膠法 、二氧化鈦 、共摻雜 、能隙
外文關鍵詞： sol-gel method, titanium dioxide, co-doped, band gap
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    • 本文使用溶膠凝膠法將銅、鉬共摻雜至二氧化鈦中，接著透過攝氏500度且在氧氣氣氛下鍛燒退火，由無定形的二氧化鈦轉變成銳鈦礦結構，透過溶膠凝膠法的摻雜方式，可以實現均勻且高濃度的摻雜，為了更有效的縮短電子能隙，我們得了解摻雜濃度與電子能隙的變化情形，再透過結構量測，確保前驅物摻入二氧化鈦，且沒有產生其他氧化物，其中拉曼光譜展示了銳鈦礦的主體結構且沒有其他氧化物的生成的訊號;XRD確定樣品為銳鈦礦晶相、透過得到的繞射峰用sherrer equtaion計算粒徑大小；吸收光譜辨別銅、鉬是否取代鈦且檢視樣品的短程有序結構；紫外光可見光吸收光譜量測樣品對可見光的吸收度和能隙大小。結果指出摻雜後的銅，探討銅、鉬共摻雜二氧化鈦，雜質能帶(impurity band)對結構的關係，同時比較銅、鉬共摻雜和各別摻雜的情況，在共摻雜的情況下，會比單一摻雜更利於降低能隙，增加光催化效率。

    In this thesis, copper and molybdenum co-doped titanium dioxide were synthesized by sol-gel method and then annealed in oxygen gas at an elevated temperature of 5000C. Sol-gel method can achieve uniform doping with high dopant concentrations. After thermal annealing, the crystal structure of the titanium dioxide sample changes from amorphous to anatase. To effectively decrease the energy band gap, knowledge on the relation between precursor concentration and band gap is of central importance. Structural information of the samples is also necessary for understanding the observed physical properties of the materials. The structures of samples were investigated by using X-ray diffraction (XRD) and Raman spectroscopy. Furthermore, X-ray absorption spectroscopy (XAS) provides short-range order information of the samples. And, UV-vis spectroscopy can be used to reveal light absorption properties and band gap values. Our experimental results clearly demonstrated that (Cu,Mo) co-doping is more effective for band gap narrowing in TiO2 than doping of Cu or Mo alone.

    摘要........................................i 致謝........................................iii 章節目錄........................................iv 圖表目錄........................................vi 第一章 序論........................................1 1.1研究動機........................................1 1.2論文簡介........................................1 第二章 文獻回顧........................................2 2.1二氧化鈦簡介........................................2 2.2二氧化鈦結構........................................2 2.3光觸媒簡介........................................4 第三章 實驗原理與方法........................................5 3.1 X光繞射(X-Ray Diffraction ;XRD).........................5 3.1.1布拉格繞射(Bragg Diffraction)..........................5 3.1.2 Scherrer 方程式(Scherrer equation)....................6 3.2 RAMAN 光譜.............................................10 3.3 X 光吸收精細結構(x-ray absorption fine structure ; XAFS).....11 3.3.1 X光吸收近邊緣結構(X-ray absorption near edge structure ;XANES) ............................................................12 3.3.2 延伸X光精細吸收光譜(Extended X-Ray Absorption Fine Structure ;EXAFS).....................................................12 3.3.3EXAFS方程式推導.........................................13 3.4紫外光-可見光吸收光譜(UV-vis spectroscopy).................18 第四章 樣品製備實驗流程.......................................20 4.1溶膠凝膠法(sol-gel method)................................20 4.1.1酸鹼值對溶膠凝膠法的影響.................................21 4.1.2溶膠凝膠法的優缺點.......................................21 4.2藥品.....................................................22 4.3製備流程.................................................23 4.4樣品代號.................................................25 第五章 數據量測與分析........................................26 5.1 X光繞射 (X-Ray Diffraction).............................26 5.2 X光吸收精密結構..........................................29 5.2.1 Mo k-edge XANES......................................29 5.2.2 Mo k-edge延伸X光吸收結構..............................30 5.2.3 Cu K-edge XANES......................................33 5.2.4 Cu k-edge延伸X光吸收結構..............................34 5.3 Raman光譜..............................................37 5.4 UV-VIS光譜.............................................38 第六章 結論.................................................41 參考文獻....................................................42

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