臺灣博碩士論文加值系統

碟狀液晶透過自組構機制(self-assembly system)，分子會自我堆疊成具有高指向性的液晶態或者是柱狀結構。由於材料本身存在著一維指向性的高效率載子遷移率，碟狀液晶在電子以及光電裝置上的應用上，例如有機發光二極體，太陽能電池，以及分子傳輸線等，都被用來當作絕佳的材料。為了讓上述的應用能夠達到更高的效益，最根本的需求在於我們如何將碟狀液晶分子堆疊成應用上所需要的配向。
本研究目的為探討影響碟狀液晶分子堆疊情形的條件，進而得以控制分子的配向。在本論文中，介紹如何在製作樣本時，藉由控制降溫速度，使得碟狀液晶分子的指向較具有均一性，並探討基板表面自由能對於碟狀液晶分子的堆疊所產生的影響。實驗中我們所使用的碟狀液晶材料為HDBP 8以及LC10。我們從實驗中發現，在具有較高表面能的基板上，碟狀液晶分子會趨向於face-on的堆疊，而在表面能較低的基板上，分子會趨向於edge-on的堆疊。更進一步地，我們藉由顯影蝕刻的方式，使單一基板表面不同區域產生不同的表面能變化，以驗證碟狀液晶分子是否會隨之產生不同的堆疊。

Discotic liquid crystals (DLCs), which consist of disc-like molecules, are known to be able to form nematic and columnar mesophases through self-assembly. Because of the high electric charge mobility in one-dimension, DLCs are found to have uses in making electronic and photonic devices, such as organic light emitting diode, photovoltaic and molecular wires. In order to achieve better performance of these applications, it is essential to obtain the desired alignment of the DLCs.
The purpose of this study is to investigate the stacking of disk-like molecules and to control their alignment. The materials used in the present studies are HDBP-8 and LC10. In this thesis, we will show that the stack of disk-like molecules is strongly influenced by temperature. We will also discuss how the molecules stacking is influenced by surface free energy. The disk-like molecules tend to stack with face-on when the surface free energy of the substrates is high. On a surface with lower surface free energy, molecules tend to stack with edge-up. In the latter part of the research, substrates are specially treated to have different surface free energies, and molecular stack on these substrates is observed.

中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
圖目錄 Ⅶ
表目錄 IX
致謝 X
第一章 緒論 1
1-1 自聚合機制 1
1-2 液晶之發現 1
1-3 液晶分類 3
1-3.1 桿狀液晶 4
1-3.2 碟狀液晶 6
1-4 碟狀液晶應用 8
1-5 研究目的 10
第二章 材料特性 12
2-1 HDBP-8 12
2-1.1 HDBP-8材料介紹 12
2-1.2 HDBP-8物性介紹 12
2-2 LC10 16
2-2.1 LC10材料介紹 16
2-2.2 LC10物性介紹 16
第三章 實驗架構介紹 19
3-1 熱台偏光顯微鏡 19
3-2 光強度檢測系統 21
3-3 接觸角量測系統 24
3-4 實驗前置準備 25
3-4.1 基板清洗 25
3-4.2 液晶盒備製 25
3-4.3 碟狀液晶樣品製備方法 26
第四章 系統量測理論 27
4-1 熱台偏光顯微鏡 27
4-2 接觸角量測系統 28
4-2.1 表面能簡介 28
4-2.2 表面能量測原理 29
4-3 光強度檢測系統 32
第五章 研究結果與討論 33
5-1 溫度對碟狀液晶分子堆疊的影響 33
5-1.1 分子熱力學探討 33
5-1.2 碟狀液晶分子在液晶盒中的堆疊情形34
5-1.3 溫度對碟狀液晶分子堆疊結論 35
5-2 基板對碟狀液晶分子堆疊的影響 35
5-2.1 單一基板堆疊情形 36
5-2.2 液晶盒中的堆疊情形 39
5-2.3 基板對碟狀液晶分子堆疊結論 41
5-3 具異方向性基板對於碟狀液晶分子堆疊的影響 42
5-3.1 Polyimide薄膜備製方式 42
5-3.2 Polyimide配向膜製作方式 43
5-3.3 Polyimide表面能測量 44
5-3.4 Polyimide 配向效果 45
5-3.5 光強度檢測系統 48
5-3.6 具異方向性基板對碟狀液晶分子堆疊結論50
5-4 使用SU-8對碟狀液晶配向 50
5-4.1 SU-8使用緣由 51
5-4.2 SU-8直線平行光柵製作方式 51
5-4.3 SU-8配向效果 52
5-4.4 SU-8直線平行光柵結構分析 55
5-4.5 SU-8直線平行光柵結構結論 57
5-5 使用C18對碟狀液晶配向 57
5-5.1 C18使用緣由 57
5-5.2 C18配向效果 60
5-5.3 光強度檢測系統 62
5-5.4 C18對碟狀液晶配向結論 63
第六章 結論 65
參考文獻 67
附錄 69

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