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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳俊顯(Chun-hsien Chen) | |
dc.contributor.author | Yu-Ju Hsu | en |
dc.contributor.author | 許育如 | zh_TW |
dc.date.accessioned | 2021-06-16T23:27:28Z | - |
dc.date.available | 2022-07-30 | |
dc.date.copyright | 2012-08-01 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-07-31 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65154 | - |
dc.description.abstract | 控制有機分子在表面的排列對於發展奈米級功能性材料為一重要議題。以光、熱、電等外界刺激(external stimuli)或改變實驗環境(溶劑、濃度)調控分子自組裝結構是為關鍵途徑。本論文第一部分利用掃描穿隧顯微術(scanning tunneling microscopy, STM)研究盤狀液晶分子六炔苯基苯(hexakis((3,4-bis(dodecyloxy)phenyl)ethynyl)benzene, HPB)於液固界面(苯基辛烷-石墨)之排列結構。我們發現利用STM探針施予脈衝電壓能改變分子的排列結構,施加3、4、5V的脈衝可分別誘導出六邊形排列(hexagonal)之單層、雙層及孔洞結構,推測原因為脈衝電壓誘導探針周圍的分子瞬間極化(polarized),而脈衝的偏壓施加方式讓基材表面帶相反電荷,因而使分子自溶液中沉降吸附於石墨基材。
論文的第二部分探究兩種液晶分子之排列結構與溶劑性質及分子濃度的影響。目標分子為修飾烷氧鏈的HPB以及修飾長烷鏈的1,2,4,5-四炔聯苯基苯(1,2,4,5-tetrakis(4-dodecyl-4'-ethynyl-biphenyl)benzene, TBPB)。HPB於表面形成六邊形單層結構,其排列不受溶劑種類影響;TBPB在不同溶劑中則呈現多種排列結構(polymorphs)。在弱吸附類溶劑中(苯基辛烷、1,2,4-三氯苯與正辛烷),TBPB皆呈現網狀結構且排列不受濃度影響。在強吸附類溶劑的十六烷溶液內,TBPB於高、中、低濃度條件分別出現直條狀、交錯及孔洞狀三種排列結構。溶劑十六烷共吸附(coadsorption)於TBPB分子烷鏈的空隙之間以凡得瓦力穩定結構,當TBPB濃度越稀,共吸附之溶劑分子數目越多,使分子由緻密排列的直條狀結構轉變成孔洞結構。 | zh_TW |
dc.description.abstract | Research of external stimuli leading to controllable assembly of functional molecules has attracted much attention. Here we demonstrate that the reversible transformation of the molecular assembly can be triggered by short electrical pulses (3~5 V/10 microsecond), conveniently delivered by STM (scanning tunneling microscope). The model compound is an alkoxylated discotic nematogen (hexakis((3,4-bis(dodecyloxy)phenyl)
ethynyl)benzene, HPB). Upon applying the pulses of 3, 4, and 5 V on the sample, the assembled pattern of HPB undergos, hexagonal, bilayer, and nanoporous, respectively, in a controllable fashion. This phenomenon is attributed to the deposition of tip-induced polarized molecules to the oppositely charged substrate whose local charge redistributes in associated with the electric stimuli. The second part of the thesis investigates how the assembly of alkylated discotic compounds is affected by the solvent properties. The examined compounds are hexakis((3,4-bis(dodecyloxy)phenyl)ethynyl) benzene (HPB) and 1,2,4,5-tetrakis(4-dodecyl-4'-ethynyl-biphenyl)benzene (TBPB). The solvents include 1-phenyloctane, 1,2,4-trichlorobenzene, and n-alkanes (n = 8, 12, 16). HPB monolayers adopt a hexagonal arrangement on graphite for all solvents used and HPB concentrations examined. For TBPB, weakly adsorbed solvents show no effect on the monolayer structure. In dodecane and hexadecane, TBPB exhibits polymorphs as a function of concentrations which involve coadsorption of solvent molecules due to van der Waal attraction from the interdigitation of their alkyl chains. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T23:27:28Z (GMT). No. of bitstreams: 1 ntu-101-R99223148-1.pdf: 4954226 bytes, checksum: cb17303793509eb296587f674c85d4aa (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | 中文摘要 IV
英文摘要 V 總目錄 VI 圖目錄 IX 表目錄 XII 第一章 緒論 1 1-1 前言 1 1-2 掃描穿隧顯微鏡之簡介 2 1-2-1 穿隧效應 2 1-2-2 STM之工作原理 5 1-2-3 STM之操作模式 6 1-3 分子於表面自組裝排列的作用力 7 1-4 改變分子自組裝排列的方法 9 1-4-1 修飾分子之化學結構 9 1-4-2 溶劑及濃度效應 13 1-4-3 施加外界刺激 17 1-4-3-1 照光 17 1-4-3-2 改變溫度 19 1-4-3-3 施加脈衝電壓 22 1-5 液晶分子簡介 27 1-5-1 液晶分類 28 1-5-2 盤狀液晶在表面的排列 28 1-6 研究動機與目的 32 第二章 實驗部分 34 2-1 實驗藥品及耗材 34 2-2 儀器及減震系統 36 2-3 STM影像掃描流程 38 2-3-1 探針製備 38 2-3-2 樣品製備及基材處理 38 2-3-3 影像掃描及處理 39 2-3-4 分子排列模型之繪製方法 40 2-4 脈衝之參數設定 41 第三章 以脈衝電壓控制分子排列 42 3-1 脈衝電壓對HPB排列結構之影響 42 3-1-1 經脈衝電壓誘導生成的HPB排列結構 42 3-1-2 吸附層與底層分子排列位向之比較 44 3-1-3 確認雙層與孔洞結構之真實性 45 3-2 可逆操控HPB排列結構的轉變 47 3-3 脈衝電壓控制HPB排列結構之推測機制 50 3-4 控制脈衝影響範圍之參數 51 3-4-1 探針z方向高度 51 3-4-2 添加電解質(TBAP)濃度 53 第四章 溶劑及濃度對分子排列之影響 55 4-1 溶劑種類對HPB排列結構的影響 56 4-2 溶劑種類對TBPB排列結構的影響 58 4-3 TBPB溶於弱吸附類溶劑的濃度效應 60 4-4 TBPB溶於強吸附類溶劑的濃度效應 63 4-4-1 高濃度TBPB於十六烷溶劑的排列 63 4-4-2 中等濃度TBPB於十六烷溶劑的排列 64 4-4-3 低濃度TBPB於十六烷溶劑的排列 66 4-4-4 TBPB溶於十二烷的濃度效應 68 4-5 討論 71 第五章 結論 73 第六章 參考資料 75 | |
dc.language.iso | zh-TW | |
dc.title | 脈衝電壓與溶劑性質對炔苯基苯盤狀分子於石墨表面排列結構的影響:掃描穿隧顯微術之研究 | zh_TW |
dc.title | Structural Evolution of Molecular Assembly for Phenyl(ethynyl)benzenes at Liquid/Solid Interface: a Scanning Tunneling Microscopic Study | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 徐秀福(Hsiu-Fu Hsu),邱勝賢(Sheng-Hsien Chiu) | |
dc.subject.keyword | 掃描穿隧顯微術,液固界面,脈衝電壓,溶劑共吸附, | zh_TW |
dc.subject.keyword | scanning tunneling microscopy,liquid-solid interface,electrical pulses,solvent-coadsorption, | en |
dc.relation.page | 79 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-07-31 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 化學研究所 | zh_TW |
顯示於系所單位: | 化學系 |
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