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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 謝宗霖 | |
| dc.contributor.author | Ching-Yu Chang | en |
| dc.contributor.author | 張競予 | zh_TW |
| dc.date.accessioned | 2021-06-16T05:37:26Z | - |
| dc.date.available | 2017-09-04 | |
| dc.date.copyright | 2014-09-04 | |
| dc.date.issued | 2014 | |
| dc.date.submitted | 2014-08-12 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56606 | - |
| dc.description.abstract | 本文探討以石墨作為基材(matrix)之陶瓷複合材料：石墨/銳鈦礦二氧化鈦(後簡稱為銳鈦礦)及石墨/金紅石二氧化鈦(後簡稱為金紅石)，在95 % N2 + 5 % H2氣氛下高溫燒結成塊材後，其微結構與晶相的演化，並呈現此複合材料應用於導電塗料的成果，所使用的起始原料皆為粉末。
首先，本研究發現石墨的高還原能力，會增加複合系統中的氧空缺濃度，致使系統中的銳鈦礦及金紅石之晶體結構發生變化：其一，石墨/銳鈦礦複合系統中的銳鈦礦，其相轉變至金紅石之溫度低於純銳鈦礦系統，此現象源自於系統中氧空缺濃度的提高，使得鈦與氧原子重新排列的活化能降低；其二，本研究利用不同比表面積的石墨作為基材，製備石墨/金紅石複合系統，以探究石墨對於金紅石的影響為何。實驗結果顯示，此系統燒結過後皆會出現異於金紅石以及石墨的相，藉由TEM選區繞射圖形鑑定為缺乏氧離子的亞氧化鈦(TinO2n-1)，隨著選用石墨的比表面積增加，所得到成分比例之缺氧量亦會隨之提高，分別為Ti20O39、Ti8O15以及Ti7O13。本研究推論，高比表面積的石墨，能夠吸附較多的金紅石粉末，增加金紅石內之氧空缺濃度。 另一方面，從石墨/二氧化鈦複合系統的電阻量測中發現，由於複合材料中的二氧化鈦能夠吸收紫外光波段，進而產生光致激發載子，使得複合材料之電阻值在照光前後發生改變。為了將此系統中，光致調控電阻之特性應用於導電塗料，本研究仿造鉛筆成分，於複合系統中添入高嶺土，其除了具備高導電性外，同樣具有敏銳的光致調控電阻特性。最後，我們根據研究成果提出兩種導電塗料的應用方法，適用於電腦閱卷讀卡系統之判讀，期能改善現今光學判讀之準確率。 | zh_TW |
| dc.description.abstract | In this study, we unveiled the evolution of the crystal structures and the unique application of several graphite-matrix composites: graphite/A-TiO2 (anatase TiO2) as well as graphite/R-TiO2 (rutile TiO2). All specimens were prepared through press-and-sinter process under 95 % N2 + 5 % H2 reducing atmosphere.
Initially, the crystal structures of A-TiO2 and R-TiO2 in the composites were quite abnormal. The phenomena should be attributed to large amounts of oxygen vacancies reduced by graphite. In graphite/A-TiO2 system, the phase transition temperature from A-TiO2 to R-TiO2 was lower than pure A-TiO2 system, since high concentration of oxygen vacancy would render rearrangement of Ti2+ and O2- easier. In the case of graphite/R-TiO2, some oxygen-deficient phase — TinO2n-1 was acquired. Interestingly, when graphite with higher specific surface area was used, TinO2n-1 with more oxygen deficiency would be correspondingly obtained, including Ti20O39, Ti8O15 and Ti7O13 respectively. According to this tendency, we proposed that graphite with higher surface area could absorb more R-TiO2 to induce more oxygen vacancies in the composites. Finally, the resistance of the composites would alter sensitively after illumination of UV light due to generation of photo-induced carriers from TiO2. Considering the application of this specific property to conductive paint, we added kaolin into the composites to make them real pencils. It was found that their resistance behavior was quite similar to the original composites. Based on this essential result, two kinds of application of the conductive paint we prepared were offered. By means of the application, improving accuracy of judging answering cards could be accomplished. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T05:37:26Z (GMT). No. of bitstreams: 1 ntu-103-R01527001-1.pdf: 29963921 bytes, checksum: 381a67ca932d8474322f0e9e489ec522 (MD5) Previous issue date: 2014 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
誌謝 ii 摘要 iv Abstract v 目錄 vii 圖目錄 x 表目錄 xvii 第一章 緒論 1 1.1 前言 1 1.2 研究動機與方向 2 1.3 論文架構 3 第二章 文獻回顧 4 2.1 碳的種類 4 2.1.1 石墨的基本性質 4 2.1.2 金剛石、富勒烯、奈米碳管的基本性質 10 2.2 二氧化鈦 12 2.2.1 二氧化鈦的基本性質 12 2.2.2 二氧化鈦相變化 15 2.2.3 缺陷化學 19 2.2.4 氧空缺對二氧化鈦晶體結構之影響 25 2.2.4.1 Magneli相 26 2.2.4.2 晶體剪切面形成機制 29 2.2.4.3 TinO2n-1製備與應用 30 第三章 實驗方法 33 3.1 陶瓷塊材製備 34 3.1.1 試片成形 34 3.1.2 燒結 34 3.2 導電塗料製備 36 3.3 材料物理性質與電性分析 38 3.3.1 X光繞射分析 38 3.3.2 掃描式電子顯微鏡 39 3.3.3 穿透式電子顯微鏡 39 3.3.4 重量損失 40 3.3.5 電性量測 40 3.3.5.1 石墨與石墨/二氧化鈦複合塊材 40 3.3.5.2 導電塗料 43 第四章 實驗結果與討論 46 4.1 石墨起始粉末相鑑定與微結構分析 47 4.2 Degussa P25起始粉末相鑑定與微結構分析 49 4.3 銳鈦礦與金紅石起始粉末定量分析 50 4.4 銳鈦礦粉末與塊材物理性質分析 55 4.4.1 相鑑定 55 4.4.2 微結構分析 58 4.5 金紅石粉末與塊材物理性質分析 63 4.5.1 相鑑定 63 4.5.2 微結構分析 64 4.6 複合塊材物理性質分析 67 4.6.1 石墨/銳鈦礦複合塊材 67 4.6.1.1 相鑑定 67 4.6.1.2 微結構分析 73 4.6.2 石墨/金紅石複合塊材 74 4.6.2.1 相鑑定 74 4.6.2.2 微結構分析 77 4.6.2.3 穿透式電子顯微鏡分析 78 4.6.3 石墨粉對金紅石晶體結構的影響 87 4.6.3.1 相鑑定 87 4.6.3.2 微結構分析 89 4.6.3.3 穿透式電子顯微鏡分析 90 4.6.3.4 重量損失分析 105 4.7 石墨與複合塊材電性分析 107 4.8 導電塗料電性分析與應用 116 4.9 綜合討論 122 4.9.1 石墨/二氧化鈦複合塊材 122 4.9.2 應用 124 第五章 結論 126 5.1 研究成果 126 5.2 未來研究方向 127 參考文獻 129 | |
| dc.language.iso | zh-TW | |
| dc.subject | 二氧化鈦 | zh_TW |
| dc.subject | 石墨 | zh_TW |
| dc.subject | 複合結構 | zh_TW |
| dc.subject | 氧空缺 | zh_TW |
| dc.subject | TinO2n-1 | zh_TW |
| dc.subject | 導電塗料 | zh_TW |
| dc.subject | conductive paint | en |
| dc.subject | TiO2 | en |
| dc.subject | composite | en |
| dc.subject | oxygen vacancy | en |
| dc.subject | TinO2n-1 | en |
| dc.subject | graphite | en |
| dc.title | 石墨與二氧化鈦複合材料在氧空缺影響下之晶體結構與微結構分析及其應用 | zh_TW |
| dc.title | The Crystal Structure, Microstructure and Application of Graphite-Titanium Dioxide Composites under the Influence of Oxygen Vacancies | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 102-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 段維新,薛景中,郭俞麟 | |
| dc.subject.keyword | 石墨,二氧化鈦,複合結構,氧空缺,TinO2n-1,導電塗料, | zh_TW |
| dc.subject.keyword | graphite,TiO2,composite,oxygen vacancy,TinO2n-1,conductive paint, | en |
| dc.relation.page | 137 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2014-08-12 | |
| 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 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-103-1.pdf 未授權公開取用 | 29.26 MB | Adobe PDF |
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