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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林招松(Chao-Sung Lin) | |
dc.contributor.author | Che-Yueh Cheng | en |
dc.contributor.author | 鄭哲岳 | zh_TW |
dc.date.accessioned | 2021-06-15T01:21:59Z | - |
dc.date.available | 2009-07-28 | |
dc.date.copyright | 2009-07-28 | |
dc.date.issued | 2009 | |
dc.date.submitted | 2009-07-24 | |
dc.identifier.citation | 1. 高濂,鄭珊,張青紅,「奈米光觸媒」,五南圖書出版股份有限公司,2004年4月。
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42752 | - |
dc.description.abstract | 奈米管狀結構相較於粉末結構有著更大的表面積,加上管狀排列能減少質傳阻礙,增進光電轉換的效率。以陽極處理法來製作奈米鈦管,具有低成本、高效率、製程相對簡單、結構排列有序等優點。陽極處理的電解液選擇多元,可大致分為水溶液以及非水溶液系統。文獻指出,在相同的操作條件下,以非水溶液系統進行陽極處理製備奈米鈦管時,能成長出較佳的外觀形貌,在後續應用上亦具有較良好的效率。
本研究採用陽極處理法在純鈦箔片上成長奈米鈦管,電解液則採用非水溶液系統,以甘油(glycerol)為主體,加入0.5wt%NH4F 配置成電解液,改變實驗參數:陽極處理電壓(20、40、60、80V)、電解液溫度(5、15、25、40、50℃)、陽極處理時間(3、6、9、12、24h)、電解液含水量(0、5、10、90%),藉此釐清在甘油系統中,實驗參數對氧化膜形貌的影響,並對氧化膜生長機制做討論。結果顯示,鈦管管徑寬與操作電壓成正相關,陽極氧化時間、電解液的溫度及含水量若提高,將增加自由氟離子攻擊氧化膜表面的機會,造成管徑寬的分布有較大的範圍,呈現較不均勻的形貌。氧化膜厚度在陽極氧化時間12小時內,與陽極氧化時間成正相關,在50 ℃以內,膜厚也與溫度有同步趨勢。實驗過程中,甘油扮演調整溶液黏度的角色,不參與反應;鈦在陽極處理中需經過三階段的氧化,即鈦的氧化數變化順序為+2、+3、+4,亦即在氧足量存在時,鈦以高氧化價態存在;當氧的存在量不足時,鈦則以高低氧化價態混和存在。 針對氧化膜表面完整度進行改善,在原本電解液配置中,再加入NH4Cl作為輔助電解質,進行陽極處理後形成一緻密的含氯氧化層,其中並無氟的存在,氧化膜伴隨些微蝕孔以及穿孔存在,無法形成預期的管狀結構,顯示此方法並不能達到期望效果。 | zh_TW |
dc.description.abstract | Compared to titanium dioxide (TiO2) nanoparticles, self-organized TiO2 nanotubes display larger specific areas and mass transportation rates, which, in turn, enhance the photoelectric conversion efficiency. Over the past few years, self-organized TiO2 nanotube layers prepared by electrochemical methods have received ever-increasing interest. Among the electrochemical methods, the anodization method has several advantages such as low cost, high efficiency, and comparatively simple in operation. Self-organized TiO2 nanotubes can be made on pure Ti foils anodized in aqueous or non-aqueous electrolytes. TiO2 nanotubes formed in non-aqueous electrolytes show better morphology and performance than those formed in aqueous electrolytes.
In the present work, TiO2 nanotubes have been prepared on pure Ti foils anodized in non-aqueous glycerol solution containing 0.5wt% NH4F. Several anodizing parameters were studied to gain better understanding about the formation and growth mechanism of TiO2 nanotubes, including anodization voltage (20, 40, 60, 80V), electrolyte temperature (5, 15, 25, 40, 50℃), anodization time (3, 6, 9, 12, 24h), and electrolyte water concentration (0, 5, 10, 90 vol%). The results show that the average diameter of the tubes increased with increasing anodization voltage. After prolonged anodization in the solution containing more water at higher temperatures, the tubes exhibited a broader distribution in tube diameter due to severer attack by free fluorine ions. Longer anodization times up to 12 h and higher electrolyte temperatures resulted in thicker anodic film composed of TiO2 nanotubes. Glycerol in the electrolyte influenced the solution viscosity, but did not involve in the formation of TiO2 nanotubes as Ti was sequentially oxidized to +2, +3, and finally +4 valence. That is, Ti was oxidized to 4 valence in the presence of abundant oxygen source, while was in a mixture of various valence states in the deficit of oxygen. To improve the surface integrity of the nanotubes, NH4Cl was added to the electrolyte. However, the anodic film formed in the electrolyte containing Cl- and F- was a rather compact oxide layer in which Cl species was detected, but F species was absent. Moreover, nanotubes were not observed in this compact oxide film. Consequently, the presence of Cl- in the electrolyte suppressed the formation of TiO2 nanotubes on Ti anodized in glycerol solution containing F-. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T01:21:59Z (GMT). No. of bitstreams: 1 ntu-98-R96527051-1.pdf: 4150154 bytes, checksum: 9225b4e70a92e361cb01355b2c0463de (MD5) Previous issue date: 2009 | en |
dc.description.tableofcontents | 總目錄
口試委員會審定書....................................I 誌謝......................................................II 摘要....................................................III Abstract..........................................IV 總目錄.................................................VI 表目錄.................................................VIII 圖目錄....................................................IX 一、緒論.................................................1 1.1前言.....................................................1 1.2研究動機與目的.......................................1 二、文獻探討................................................................................................................3 2.1奈米材料簡介..................................................................................................3 2.2二氧化鈦晶體結構..........................................................................................4 2.3二氧化鈦薄膜製備..........................................................................................7 2.4鈦金屬陽極處理..............................................................................................9 2.4.1陽極處理法...............................................................................................9 2.4.2鈦陽極處理之電解液種類.....................................................................11 2.4.3鈦陽極處理之反應機制.........................................................................12 2.5甘油簡介........................................................................................................15 2.6染料敏化太陽能電池簡介............................................................................16 三、研究方法..............................................................................................................18 3.1材料準備與前處理........................................................................................18 3.1.1試片前處理.............................................................................................18 3.1.2電解液配製.............................................................................................19 3.2實驗製程設定................................................................................................19 3.3實驗結果分析................................................................................................20 3.3.1導電度量測.............................................................................................20 3.3.2微結構分析.............................................................................................20 3.3.2.1場發射掃描式電子顯微鏡觀察..................................................20 3.3.2.2聚焦離子束..................................................................................21 3.3.2.3穿透式電子顯微鏡觀察..............................................................21 3.3.2.4能量散佈光譜儀..........................................................................22 3.3.2.5化學分析電子光譜儀..................................................................22 四、結果與討論..........................................................................................................27 4.1電解液導電度量測........................................................................................27 4.2陽極氧化電壓大小對氧化膜影響................................................................30 4.3電解液溫度對氧化膜影響............................................................................36 4.4陽極處理時間對氧化膜影響........................................................................42 4.5甘油電解液含水量對氧化膜影響................................................................48 4.6 ESCA縱深分析.............................................................................................55 4.7陽極氧化膜之橫截面TEM及EDS成分分析............................................60 4.8陽極處理成長奈米尺寸二氧化鈦管機制討論............................................66 4.9加入輔助電解質NH4Cl後之陽極氧化薄膜分析.......................................69 五、結論.......................................................................................................................77 六、參考文獻...............................................................................................................78 | |
dc.language.iso | zh-TW | |
dc.title | 在含氟甘油電解液中陽極氧化鈦箔製備二氧化鈦奈米管 | zh_TW |
dc.title | Fabrication of TiO2 Nanotubes on Titanium Foil Anodized in Fluoride Containing Glycerol Electrolytes | en |
dc.type | Thesis | |
dc.date.schoolyear | 97-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 莊東漢,林景崎,葛明德 | |
dc.subject.keyword | 純鈦,陽極處理,奈米鈦管,甘油,氟化銨,二氧化鈦, | zh_TW |
dc.subject.keyword | pure Ti,anodization,TiO2 nanotube,glycerol,NH4F,titanium dioxide, | en |
dc.relation.page | 81 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2009-07-24 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 材料科學與工程學研究所 | zh_TW |
顯示於系所單位: | 材料科學與工程學系 |
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