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研究生:林雨萱
研究生(外文):Yu-Hsuan Lin
論文名稱:利用電沉積法製備熱電材料Sb2Te3和Bi2Te3及其特性分析
論文名稱(外文):The characterization of prepared thermoelectric materials Sb2Te3 and Bi2Te3 by electrochemical deposition
指導教授:朱錦明
指導教授(外文):Chin-Ming Chu
口試委員:萬其超楊文彬李文錦楊希文朱錦明
口試委員(外文):Chi-Chao WanWen-Pin YangWen-Chin LiHsi-Wen YangChin-Ming Chu
口試日期:2011-06-29
學位類別:碩士
校院名稱:國立聯合大學
系所名稱:化學工程學系碩士班
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:77
中文關鍵詞:Bi2Te3、Sb2Te3、電沉積、熱電材料、EQCM、成核機制
外文關鍵詞:bismuth telluride ,antimony telluride , electrodeposition ,thermoelectric material , EQCM ,nucleation mechanism
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Bi2Te3與Sb2Te3還有其衍生物都是屬於窄能帶的半導體之熱電材料。其p-type或n-type的性質會因為不同的組成比或參雜不同的元素後而有所不同。其可應用在生醫、熱電、光電、太陽能電池…等方面。目前在室溫下Bi2Te3與Sb2Te3有很好的熱電特性。本文中在水溶液系統下,先以定電流改變不同參數條件(溫度、組成濃度、攪拌) 進行電化學沉積,製備出Bi2Te3與Sb2Te3之共沉積粉末。並利用循環伏安法了解其二元合金Bi/Te及Sb/Te之電化學行為。又HTeO2+在酒石酸下,有兩個還原峰表示其Te之沉積有兩個還原機制。製備出的電沉積粉末並利用SEM、EDS及XRD等分析方法了解其粉末之表面型態、組成及BixTey、SbxTey之晶相皆在( 0 1 5 )面有好的優選方向。最後利用儀器CHI-440石英晶體微天秤(EQCM),分析電化學沉積中添加酒石酸螯合劑後為逐步成核機制,不加酒石酸為瞬間成核機制。電化學成績效率約為78%。

Bismuth telluride、antimony telluride and their derivative compounds are narrow band-gap semiconductors with good thermo- electric characteristics at room temperature . Their thermoelectric nature depends on their composition . Bi2Te3 and Sb2Te3 are widely used for biomedical、 thermoelectric、optoelectronic fields and solar cell and so on . In this paper , we change different parameters (temperature、composition of solution、 stirring) to codeposit thermoelectric powders by electro- chemical deposition (ECD) in aqueous systems . We can known the electrochemical behavior of the binary alloy Bi/Te and Sb/Te is known by cyclic voltametry . HTeO2 + in tartaric acid, there are two reduction peaks,This means that Te has two reduction mechanisms by cyclic voltammogram . We use SEM、EDS、XRD to analyze the morphology、composition and know that the crystalline phases of BixTey and SbxTey are in the (0 1 5) preferred orientation having a good surface . Finally,we use the instrument CHI-440 (EQCM) to analyze electrochemical deposition mechanism after adding tartaric acid as a chelating agent for progressive nucleation mechanism, while for instaneous mechanism without tartaric acid. Electrochemical performance efficiency is about 78%.
總目錄
中文摘要………………………………………………………………..Ⅲ
英文摘要……………………………………………………………..…Ⅳ
總目錄表……………………………………………………………….Ⅵ
圖目錄..…………………………………………………………………Ⅸ
表目錄…………………………………………………………………XIV
第一章 前言 ………………………………………………………..…1
第二章 研究背景………………………………………………………4
2-1 熱電效應…………………………………………………………….4
2-1-1 Seebeck效應……………………………………………………4
2-1-2 Peltier效應………………………………………………………6
2-1-3 Thomson效應……………………………………………….…..7
2-2 熱電優值………………………………………………………….…8
2-3熱電材料…………………………………………………………....10
2-3-1材料分類……………………………………………………….10
2-3-2 Bi2Te3合金特性……………………………………………..…11
2-3-3 Sb2Te3合金特性………………………………………….……13
2-4 電化學沉積原理………………………………………………...…14
2-4-1 電化學動力學………………………………………….…..…16
2-4-2 電化學成核機制…………………………………………...…17
2-4-3 循環伏安法……………………………………………...……20
2-5 石英晶體微天秤(EQCM) …………………………………………22
第三章 研究方法……………………………………………………..24
3-1實驗流程……………………………………………………………24
3-1-1 鍍液配置……………………………………………………...24
3-1-2 基材前處理…………………………………………………...25
3-1-3 實驗方式與流程……………………………………………...25
3-2藥品…………………………………………………………………28
3-3實驗器材……………………………………………………………29
3-4分析儀器……………………………………………………………30
第四章 結果與討論…………………………………………………..31
4-1利用循環伏安法探討電化學行為…………………………………31
4-1-1 HTeO2+循環伏安掃描…………………………………………31
4-1-2 Sb3+循環伏安掃描…………………………………………….34
4-1-3 SbxTey循環伏安掃描………………………………………….35
4-1-4 Bi3+循環伏安掃描…………………………………………….37
4-1-5 BixTey循環伏安掃描………………………………………….38
4-2 探討成核機制………………………………………………...……40
4-3定電位沉積對於組成之影響……………………………………...48
4-4不同條件下沉積對沉積產物組成之影響…………………………54
4-4-1 電流密度對共沉積物比例之影響………………………...54
4-4-2 攪拌與溫度對共沉積物比例之影響…………….……..…58
4-5 電流密度及溫度對電沉積型態之影響…………………………..61
4-6共沉積產物XRD晶相分析……………………………………….69
第五章 結論…………………………………………………………..72
參考文獻………………………………………………………………..74


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