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研究生： 努妮雅
Nia - Nurfitria
論文名稱： 以自組裝單分子層調控電極功函數：偶極距效應
Work Function Modulation with Self-Assembled Monolayer (SAM): Effect of Dipole Moment
指導教授： 陶雨台
Yu-Tai Tao
口試委員: 戴龑
Yian Tai
徐秀福
Hsiu-Fu Hsu
學位類別： 碩士
Master
系所名稱： 工程學院 - 化學工程系
Department of Chemical Engineering
論文出版年： 2015
畢業學年度： 103
語文別： 英文
論文頁數： 64
中文關鍵詞： 功函數 、自組裝單分子 、極性
外文關鍵詞： Work function, Self-assembled monolayer, Dipole moment
相關次數： 點閱：300  下載：2 
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    • 在本論文中，一系列帶有極性取代基的芳香烴硫醇及磷酸化合物在金及氧化銦錫/鋁電極表面形成之自組裝單分子薄膜以藉此調控電極功函數。單分子薄膜之結構乃由橢圓儀、反射式紅外線光譜與水接觸角所鑑定。金和氧化銦錫/鋁表面的自組裝單分子薄膜之覆蓋率則使用循環伏安法與X射線光電子能譜測量。實驗結果顯示增加分子內的極性會造成表面分子傾斜偏離法線方向而讓覆蓋率下降。因此高極性之分子無法如預期提昇功函數，其原因亦是在於分子組裝於表面時，高極性官能基之偶極-偶極斥力迫使分子傾斜於表面而改變了偶極距方向。此外在本研究中以較小極性之前驅物形成自組裝薄膜後，進行原位表面氧化反應，以便形成高極性官能基之實驗並沒有成功。

    A series of dipolar aromatic thiol and phosphonic acid compounds were used to form self-assembled monolayers on gold and ITO/Al surfaces in order to modulate their work function. Ellipsometry, reflection absorption infrared spectroscopy (RAIRS) and water contact angle were used to characterize the structure of the monolayers. Cyclic voltammetry and HRXPS were used to determine the surface coverage of the self-assembled monolayer molecules on the gold and ITO/Al surface. The results show that as the dipole moment increases in the molecule, the molecules tilt away from the surface normal and also the surface coverage decreases. This can be the reason that a strongly dipolar molecule does not necessarily generate work function change proportionally because of the dipole direction changes by molecular tilting caused by dipole-dipole repulsion between the strong polar groups in the monolayer assembly. It is also shown that in situ surface oxidation in this study did not successfully provide the strong dipolar group from its less polar precursor.

    ABSTRACT iv TABLE OF CONTENTS vii LIST OF FIGURES ix LIST OF TABLE xii CHAPTER 1 INTRODUCTION 1 1.1. Research Background 1 1.2. Problem Statement 3 CHAPTER 2 LITERATURE STUDY 5 2.1. Organic Electronic Device: Organic Light Emitting Diode 5 2.2. Interface Engineering in Organic Light Emitting Diode (OLED) 8 2.3. Work Function Modulation with Self-Assembled Monolayer 9 2.4. Oxidation Reaction on Self-Asssembled Monolayer 12 2.5. Characterization of Self-Assembled Monolayer 13 2.5.1. Ellipsometry 13 2.5.2. Contact Angle Measurement 14 2.5.3. Reflection-Absorption Infrared Spectroscopy 15 2.5.4. Photoelectron Spectrometer (AC-2) 17 2.5.5. Cyclic Voltammetry (CV) 17 2.5.6. X-Ray Photoelectron Spectroscopy (XPS) 18 CHAPTER 3 EXPERIMENTAL SECTION 20 3.1. Chemical and Materials 20 3.2. Procedure 21 3.2.1. Preparation of Self-Assembled Monolayer on Gold 21 3.2.2. Preparation of Self-Assembled Monolayer on ITO/Al 21 3.2.3. Characterization of Self-Assembled Monolayer 22 3.2.4. Oxidation Reaction of Sulfide Group in Self-Assembled Monolayer 23 CHAPTER 4 RESULTS AND DISCUSSION 24 4.1. Characterization of Self-Assembled Monolayer 24 4.2. Effect of the Dipole Moment on the Gold and ITO/Al Work Function 33 4.3. Oxidation Reaction on the Self Assembled Monolayer 44 CHAPTER 5 CONCLUSION 49 REFERENCES 50

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