研究生: |
簡珮珊 Chien, Pei-Shan |
---|---|
論文名稱: |
長鏈雙炔基衍生物於金屬表面之自組裝薄膜之有向聚合行為研究 The Study of Oriented Self-Assembly and Polymerization of Diacetylenic Derivatives on Metal Surfaces |
指導教授: |
陶雨台
Tao, Yu-Tai |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 化學系 Department of Chemistry |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 149 |
中文關鍵詞: | 長鏈雙炔基衍生物 、自組裝薄膜 、金屬表面 、有向聚合行為 |
相關次數: | 點閱:4 下載:0 |
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本論文主旨在於探討當雙炔基分子在不同的金屬表面以不同的鍵結力量形成自組裝單層膜(self-assembly monolayer, SAM),加以「施予外力種類與大小」、「施予時間長短」等變因時,對於分子在表面排列及其聚合性質的影響。起始目的是希望雙炔基分子在有方向性的外力引導下,如水流,可於所吸附之金屬基材上形成良好並有方向性排列之SAM;並利用雙炔基遇UV光發生topochemical聚合反應而形成ene-yne conjugation chain的特性,得到在特定方向有極佳導電度的結果。
在此論文中合成了多種具有雙炔基但不同官能基的分子如酸、二硫醇與醇。依照分子與金屬基材表面形成吸附的鍵結力量不同,分別有共價鍵(如金和二硫醇分子)、離子鍵(如銀和酸分子)與氫鍵(如銀和醇分子)三種。製備條件在「施予外力種類與大小」部份有單純浸泡(immerse only)、浸泡後沖提(immerse then rinse,快/慢速水流分別)與直接沖提(rinse directly,快/慢速水流分別);在「施予時間長短」部分則有10分鐘、30分鐘與60分鐘之不同。透過反射式紅外線光譜、拉曼光譜與橢圓儀膜厚等量測,試圖歸納比較出有系統的實驗觀察與結果討論。
以雙炔基分子與金屬基材表面形成吸附的鍵結力量種類作為區分,論文第一部分先是討論雙炔基長碳鏈酸分子在銀上的吸附表現。此部分我們發現單純浸泡的條件能使雙炔基酸分子在銀上形成良好穩定的SAM,並且有最佳強度的拉曼聚合訊號;假如先浸泡形成SAM再進行沖提,或直接沖提,結果顯示隨沖提速度不同,分子膜結構與聚合性質亦不同。慢速沖提所得之拉曼聚合訊號甚弱,紅外線吸收訊號或膜厚也無法相比。
論文第二部份探究的是雙炔基長碳鏈二硫醇分子在金上的吸附表現。此部分所嘗試的條件有單純浸泡與浸泡後沖提。實驗中觀察到當雙炔基長碳鏈二硫醇分子吸附到金表面上之後,所有條件都沒有出現分子被沖離或刷離表面的現象,因此表面分子吸附的總體密度沒有降低。
論文最後關注的主題是雙炔基長碳鏈醇分子在銀上的吸附表現。實驗結果顯示(一)雙炔基長碳鏈醇分子在銀的表面可藉著浸泡條件吸附形成單層膜,但照射UV光之後,未看見雙炔基分子有聚合的現象產生。(二)當銀的表面已形成雙炔基長碳鏈醇單層膜吸附時,再進行沖提實驗只會擾亂了分子在表面的排列,亦沒有使之在UV光照射後聚合。
The main purpose of this thesis is to study the structures of self-assembled monolayers of several series of diacetylenic compounds adsorbed on various substrates through various binding interactions and the effect of external forces on the packing and possible oriented polymerization of these monolayers. Of particular interest is the feasibility of preparing an oriented monolayer such that upon UV-irradiation, topochemical polymerization along a specific direction can be achieved to give extensive ene-yne conjugated chains.
In this work, a number of diacetylenic compounds differing in the terminal functional group (carboxylic acid, thiol, alcohol) were prepared. Different interactions (covalent, ionic, and H-bonding) are involved depending on the substrate (silver, gold, and aluminum) and the anchoring functional group. Self-assembled monolayers were prepared either by simple immersion or under the influence of a solution flow or a combination of both for various periods of time. The structures of the resulting monolayers upon UV-irradiation were characterized by reflective infrared absorption spectroscopy (RIAS), Raman spectroscopy and ellipsometry. The data were analyzed with respect to polymerizability of the monolayer and the directionality of conjugation. Under current conditions, no evidence of oriented polymerization has been found.
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