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研究生:謝佳益
研究生(外文):Chia-yi Hsieh
論文名稱:製備具有分支的奈米碳管
論文名稱(外文):synthesis of branched carbon nanotubes
指導教授:陳建忠陳建忠引用關係
指導教授(外文):Chien-chong Chen
學位類別:碩士
校院名稱:國立中正大學
系所名稱:化學工程所
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:2006
畢業學年度:95
語文別:中文
論文頁數:122
中文關鍵詞:化學氣相沈積法奈米碳管分支奈米碳管
外文關鍵詞:carbon nanotubesbranched carbon nanotubeschemical vapor deposition
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本論文利用簡單的化學氣相沈積法(thermal chemical vapor deposition)製備具有分支的奈米碳管,且藉由不同的參數探討可以得到不同的分支長度、管徑及密度,另外由分支與主幹間碳層的變化,去探討分支與主幹間的關係。除此之外,也嘗試以主幹上的碳來充當碳源長出具有分支的奈米碳管。這邊除了對產物的外觀形貌加以研究,性質上則是透過與水之間接觸角的大小比較矽基板在長完分支前後疏水性質的好壞。
實驗上利用濺鍍機將鎳(Ni)觸媒均勻地承載在奈米碳管上,以容易取得的丙酮(acetone)當碳源,再由化學氣相沈積法生長具有分支的奈米碳管,並且由參數的探討得知:隨著反應的溫度越高,單一根碳管上分支密度有變小的趨勢;進料時間的時間越長,分支的長度和密度也有增加的趨勢;觸媒厚度越厚,則分支的管徑會越粗,因此透過這樣的參數探討就可以選擇其所需的條件,而得到其所想要的分支。另外透過高解析穿透式電子顯微鏡的分析,除了可以證明分支是從碳管上長出去的,並且由分支與主幹間碳層變化,推測分支碳源有一部份來自於主幹本身,因此後來嘗試在沒有新的碳源條件下,製備出具有很短分支的碳管,也間接地證實了我們的猜測。另外透過接處角儀的分析,得知在長完分支後的基板變的更疏水,這都是本研究所獲得的最後結果。
This research was studied on growth of branched CNTs by thermal chemical vapor deposition. The process was mainly including three steps:
First, FeNi powder was dispersed on Si wafer by spinning coater, and producing carbon nanotubes on Si wafer that there was FeNi on by thermal chemical vapor deposition . Second , Ni catalysts was loaded on the first carbon nanotubes by sputter, Ni-coated carbon nanotubes were formed. Third , branched carbon nanotubes were produced by thermal chemical vapor deposition , and Ni coated CNTs were catalytic roles.
By the instruments, ex: SEM,TEM,HR-TEM analysis, we can gain much information. How was the effect by the different parameters, such temperature , the catalytic thickness , the time of the carbon sources. Three conclusion:
1. temperature: the higher temperature, the lower density of branched CNTs
2. the catalytic thickness : the more catalytic thickness , the larger diameters of branched CNTs.
3. the time of carbon sources : the longer time of carbon sources , the higher density of branched CNTs and the longer branched-CNTs .
Otherwise , were there branched CNTs with no new carbon source? Yes, there were. And we were also studying the mechanism about it. Furthermore , discussing the hydrophobic of branched CNTs. The results is that the hydrophobic effect is better with branched carbon nanotubes.
1.簡介……………………………………………………………………...….1
1.1前言……………………………………………………………………....1
1.2奈米碳管之合成法……………………………………………...…….…2
1.2.1電弧法………………………………………………………...……....3
1.2.2雷射蒸鍍法……….……………………………………………...…...4
1.2.3化學氣相沈積法……………………………………………………...6
1.2.3.1 CO disproportionation法 …………………………..…………..6
1.2.3.2催化熱分解法………………….………………………...………7
1.2.3.3電漿輔助化學氣相沉積法(PE-CVD)………………………...8
1.2.3.4微波電漿輔助化學氣相沉積法(MP-CVD)…………...……...9
1.3 奈米碳管之成長機制…………………………………………...…….12
1.4 奈米碳管之結構與性質……………….………………...……………15
1.4.1單壁奈米碳管之結構與電性…………………………...…………16
1.4.2多壁奈米碳管之結構與電性……………………………...………19
1.5機械性質………………………………………………………………..20
1.5.1軸向模數……….………………………………………...……….20
1.5.2 徑向模數…………………………………….……….………….23
1.5.3儲氫性質……………….................................................................23
1.6奈米碳質材料的拉曼光譜研究………………….…….…….……..….24
1.7濺鍍系統的介紹……………….………………..……...……….……...26
1.7.1濺鍍系統的應用…………………………..……....….…………..26
1.7.2濺鍍系統的特點…………………….………………..…………..27
1.7.3濺鍍系統的缺點………………………………..………………...27
1.8 碳管的親疏水性………………….….…………..……..…..….……...28
1.9 原子層沈積……………………….….…………..……..…..….……...34
2.文獻回顧……………………………………….…..……….……………..37
2.1 從主幹上長出分支……………..……………………………………..37
2.1.1 含浸的方式將觸媒乘載在碳材上…………...……..…………..37
2.1.2 利用濺鍍機將觸媒乘載在碳的基材...........................................40
2.2 主幹本身的分支....................................................................................41
2.2.1 觸媒合成法...................................................................................42
2.2.2 模具(template)合成法..........................................……………….44
2.2.3電弧法………………..…………………………………………...45
2.2.4氣溶膠法.........................................................................................46
3. 研究動機....……………………………………...……………………...48
4. 實驗方法與設備…………………………………...…….……………..49
4.1儀器設備..............……………………………………………....….....49
4.2藥品與工具………………………........................................................53
4.3 實驗步驟.……………………………………….…...…….................54
4.4實驗裝置圖…………………………………………….......................57
5. 結果與討論…..........................................................................................59
5.1實驗參數探討…………………………………………...………........59
5.1.1不同溫度………………………………………..............................59
5.1.2進料時間…………..........................................................................69
5.1.3不同膜厚……………………...…………………...………...…….76
5.2 高解析TEM分析…………..…………………………...…….……..81
5.2.1 有通入新碳源.................................................................................81
5.2.2 沒有通入新碳源.............................................................................88
5.3疏水性的探討……………………………….......................................98
6.結論與未來展望………………………………………….….……...…...101
7.參考文獻………………………………………….……….…….…...…..103
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[84]成會明,奈米碳管,第196-197頁,台北,五南圖書出版股份有限公司,民國93年。
[85] Clive Whiston,編譯:李志甫,X-射線法,第113頁,台北,高立圖書有限公司,民國九十年。
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