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博碩士論文 etd-0727109-165009 詳細資訊
Title page for etd-0727109-165009
論文名稱
Title
有機分子膜的分子排列與力學特性之研究
Study on molecular packing and its effect on the tribological properties of ultrathin molecular films
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
80
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2009-07-10
繳交日期
Date of Submission
2009-07-27
關鍵字
Keywords
原子力顯微鏡、自組裝單分子薄膜、溶劑效應、摩擦力、黏著力
Adhesion, Atomic force microscopy, Friction, Self-assembled monolayer, Solvent effect
統計
Statistics
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中文摘要
本研究討論溶劑效應對長碳鏈自組裝分子Octadecyltrichlorosilane (OTS)生長速度與分子排列之探討,並利用原子力顯微鏡 (AFM) 進行薄膜力學測量。不同溶劑hexadecane、toluene、benzene、chloroform、dichloromethane形成不同的薄膜,可利用AFM與傅立葉紅外光譜儀初步觀察其分子排列的差異性,並用表面摩擦力與黏著力測量表面力學特性。接著利用奈米壓痕實驗與計算,以推算得知不同薄膜的軟硬程度以及探針對表面的接觸面積,可發現,在探針施加相同力量時,溶劑hexadecane形成之薄膜表面較為堅硬,探針不易對薄膜產生形變或凹陷;溶劑chloroform與dichloromethane形成之薄膜表面較為鬆軟,探針易對表面產生形變或凹陷。最後利用Langmuir isotherm證實溶劑與 OTS分子之間的作用力,以推測其溶劑對自組裝分子生長排列時所扮演的角色。
Abstract
Self assembled monolayer films (SAMs) deposited on silicon surfaces have gained considerable interest due to their ability to modify surface properties for advanced applications in sensors, MEMS, and NEMS devices. These molecular films are typically deposited on silicon surfaces from solution using a variety of solvents, which can influence the molecular packing and quality of the films. To better understand these effects, we have performed a systematic solvent effect study of the growth of n-Octadecyltrichlorosilane (OTS) on silicon substrates using chloroform, dichloromethane, toluene, benzene and hexadecane. The films were characterized using contact angle measurements, Fourier Transform Infrared Spectroscopy (FTIR), and Atomic Force Microscopy (AFM) to evaluate the SAM growth rate and film quality. Lateral Force Microscopy (LFM) and transmission FTIR were used to characterize the molecular packing. Finally, we used AFM to make adhesion measurements on the films and correlated these results with friction data. These techniques provide a means to characterize the local nanoscale packing of the films. The Hertzian contact model was used to model and describe the adhesion and friction result. Our results show that using hexadecane as the solvent produced OTS films with the highest density molecular packing. By comparing to Langmuir-Blodgett SAM film deposition methods, we show that it is the intermolecular interaction between the solvent molecules and OTS that determines this density. Thus, the structure and chemical properties of the solvent molecule strongly influences the molecular packing, quality, and performance of the SAM film.
目次 Table of Contents
中文摘要………………………………………………………………i
英文摘要………………………………………………………………ii
目錄……………………………………………………………………iv
圖表目錄………………………………………………………………vii
第壹章 緒論
1-1 前言………………………………………………………1
1-2 有機單分子層薄膜………………………………………2
1-2.1 Langmuir-Blodgett薄膜…………………………2
1-2.1自組裝單分子薄膜………………………………3
1-3 自組裝單分子薄膜種類…………………………………5
1-4 矽烷碳鏈分子形成薄膜生長機制………………………5
1-5 影響自組裝分子生長變因………………………………8
1-6 奈米壓痕力學……………………………………………9
1-7 研究動機與方法…………………………………………11
第貳章 實驗部份
2-1 接觸角量測儀……………………………………………12
2-2 傅立葉紅外線光譜儀……………………………………15
2-3 原子力顯微鏡……………………………………………17
2-4 側向力顯微鏡……………………………………………19
2-5 Langmuir-Blodgett trough………………………………20
2-6 實驗材料…………………………………………………24
第參章 奈米壓痕理論系統
3-1 奈米壓痕理論……………………………………………27
3-2 力距離曲線原理…………………………………………27
3-3 彈性碰撞理論……………………………………………29
3-4 接觸面積理論……………………………………………30
3-4.1 Hertz 理論…………………………………………31
3-5 Maugis 理論………………………………………………32
3-5.1 DMT理論…………………………………………32
3-5.2 JKR理論…………………………………………33
3-5.3 BCP理論…………………………………………34
3-6 奈米壓痕硬度計算………………………………………34
第肆章 溶劑效應對自組裝分子之影響
4-1 前言………………………………………………………35
4-2 自組裝分子薄膜製備……………………………………36
4-3 溶劑效應對自組裝分子生長速度之影響………………37
4-4 溶劑效應對自組裝分子排列的影響……………………39
4-5 薄膜軟硬程度之測量……………………………………47
4-6 溶劑效應與自組裝分子作用力探討……………………56
4-7 溶劑效應自組裝過程的可能機制………………………58
第伍章 結論……………………………………………………………61
參考文獻………………………………………………………………62
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