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系統識別號 U0002-0107201322302700
中文論文名稱 X光吸收光譜研究Li:WO3電致色變之電子結構及原子結構
英文論文名稱 Correlation Between the Electrochromic Properties and the Electronic/Atomic Structures of Li:WO3 Studied by X-ray Absorption Spectroscopy
校院名稱 淡江大學
系所名稱(中) 物理學系碩士班
系所名稱(英) Department of Physics
學年度 101
學期 2
出版年 102
研究生中文姓名 陳鈞順
研究生英文姓名 Jiun-Shuen Chen
學號 699210075
學位類別 碩士
語文別 中文
口試日期 2013-06-21
論文頁數 49頁
口試委員 指導教授-彭維鋒
委員-李志甫
委員-張經霖
中文關鍵字 電致色變  X光吸收光譜  延伸X光吸收精細結構 
英文關鍵字 Electrochromic  XAS  EXAFS 
學科別分類 學科別自然科學物理
中文摘要 本論文主要以臨場X光吸收光譜實驗研究三種不同製程(退火溫度與前置溶液)的氧化鎢薄膜的耐久性以及在重複的染色和退色過程的原子和電子結構。染色過程運用外加正電流使鋰離子鑲嵌進氧化鎢薄膜,薄膜呈現藍色,當外加電流逆電流時薄膜回到原本透明狀態。實驗包含W L3-edge X光吸收近邊緣結構(X-ray absorption near edge structure,XANES)以及W L3-edge延伸X光吸收精細結構 (Extended X-ray absorption fine structure , EXAFS)。實驗顯示在反覆的染色過程中氧化鎢薄膜的鎢氧八面體變形使結構有序程度下降,在電子結構上奈米晶粒氧化鎢薄膜在第一個染色週期有近 97% 的回復性,與樣品在可見光區的穿透率變化一致,優越的電致色變特性可能是由於在局域上微觀的結構有較優越的鋰離子擴散性和電子的傳導性。
英文摘要 In-situ x-ray absorption spectroscopy of three different types of tungsten oxide thin films were performed to study the electronic structure of the films with repetitive cycles of coloration and bleaching process. In-situ W L3-edge x-ray absorption near edge spectroscopy (XANES) of crystalline and nanocrystalline tungsten oxide films showed that with the coloration the intensity of the spectra decreases and it increases with bleaching, which corresponds to the filling and unfilling of the density of the conduction band, respectively. After repeated cycles of coloration and bleaching the structural disordering was observed from the second derivative of W L3-edge XANES spectra. In-situ extended x-ray absorption fine structure spectra reveal that the atomic structure of the samples remain unaltered after coloration and bleaching. The nanocrystalline tungsten oxide film showed recovery of (~ 97 %) electronic and atomic structure after the first cycle of coloration and bleaching, which was substantially higher compared to other two crystalline samples. It reveals that nanocrystalline sample has superior electrochromic properties than crystalline samples.
論文目次 致謝 I
中文摘要 II
英文摘要 III
目錄 IV
圖表目錄 V
第一章、 緒論 1
第二章、 X光吸收光譜簡介 6
(一)、吸收邊緣與E0值 8
(二)、X光吸收近邊緣結構(XANES) 9
(三)、延伸X光吸收精細結構(EXAFS) 10
(四)、實驗方法 15
(五)、數據分析 19
第三章、 實驗數據分析與討論 23
(一)、樣品製備與量測 23
(二)、X光吸收近邊緣結構(XANES) 27
(三)、延伸X光吸收精細結構(EXAFS) 38
第四章、結論 44
參考文獻 45

圖表目錄
圖1-1電致色片材料著色變化圖 1
圖1-2智慧玻璃圖 1
圖2-1 光子能量與銅吸收截面關係圖 7
圖2-2 XANES與EXAFS分界圖 12
圖2-3 光電子平均自由路徑與能量關係圖 12
圖2-4 單一散射與多重散射之圖像(a)為單一散射路程示意圖 13
(b)為多重散射路程示意圖 13
圖2-5 射出電子受鄰近原子的背向散射,而產生干涉現象 14
(a)建設性干涉 (b)破壞性干涉 14
圖2-6 X光吸收光譜實驗示意圖 16
圖2-7 三種光譜量測方法 18
圖2-8 X光吸收光譜之數據分析流程 19
圖3-1三氧化鎢鑲嵌鋰離子示意圖 24
圖3-2 X光繞射圖 25
圖3-3電流裝置示意圖與樣品照片 26
圖3-4 (a) 樣品400T-0之W L3-edge X光吸收近邊緣結構 30
圖3-4 (b) 樣品400T-045之W L3-edge X光吸收近邊緣結構 30
圖3-4 (c) 樣品450T-045之W L3-edge X光吸收近邊緣結構 31
圖3-4 (d) 各樣品W L3-edge 扣除一個arctangent背景後積分面積圖 31
表3-1 各樣品W L3-edge白線面積積分恢復百分比表 32
圖3-5 (a) 樣品400T-0之W L3-edge光譜二次微分圖 34
圖3-5 (b) 樣品400T-045之W L3-edge光譜二次微分圖 35
圖3-5 (c) 樣品450T-045之W L3-edge光譜二次微分圖 36
圖3-5 (d) W L3-edge光譜不同樣品二次微分圖t2g 和eg分裂圖 37
圖3-7 (a) 樣品400T-0之W L3-edge延伸X光吸收精結構傅立葉轉換圖 39
圖3-7 (b) 樣品400T-045之W L3-edge延伸X光吸收精結構傅立葉轉換圖 40
圖3-7 (c) 樣品450T-045之W L3-edge延伸X光吸收精結構傅立葉轉換圖 41
圖3-8 三氧化鎢薄膜在著色和退色時的電子結構示意圖 43
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