- 學位論文
添加二氧化鈦奈米粒子液晶盒之光電與電學特性
Electro-Optical and Electrical Characteristics of Nematic Liquid Crystals Doped with Anatase TiO2 Nanoparticles
摘要
本論文旨在探討添加二氧化鈦奈米粒子之向列型液晶盒光電與電學特性。現今，液晶光電元件被廣泛使用於不同場合中，為了克服嚴峻環境中如高溫或紫外線所造成的嚴重離子問題，添加奈米粒子於液晶中的簡便及後合成特性是成為符合成本效益的解決方案。在本研究中，介電頻譜術用於測定離子濃度、擴散常數及活化能等相關離子特性；此外，電壓保持率量測乃用以評估液晶盒之品質。由介電頻譜及電壓保持率之數據可知，相較於純液晶樣品，添加奈米粒子之液晶盒有較微弱的離子效應及較高的環境容忍度。此外，液晶的相關物理性質，如介電異方性、有效彈性係數及黏彈係數（即黏滯係數與彈性係數之比值），皆可由光電與電學量測獲得；數據顯示這些液晶之物理性質並未因添加奈米粒子而有太大的變化。最後，為了模擬於太陽光下使用液晶光電元件，吾人將液晶盒曝露於低強度之長波長紫外光中，藉由介電頻譜及電壓保持率量測，驗證了添加奈米粒子之液晶盒具有抗紫外輻射之能力。 綜論，添加奈米粒子於液晶盒中，不僅僅不會影響液晶本身之物理性質，且具有較高的熱及紫外輻射容忍度。基此，含二氧化鈦奈米粒子之液晶不失為好的替代材料。
並列摘要
First and foremost, I am sincerely grateful to my advisor, Professor Wei Lee, who gave me the opportunity to learn and conduct research under his direction since I was in my senior year of undergraduate studies until I received my master's degree from the Nanotechnology program at Chung Yuan Christian University. During this period, I have not only learned a great deal of knowledge, including professionalism and research methods in my area of study, but also life skills; such as ways that one should treat people, ones conduct within society, and how to practice ones charm in order to survive in the unknown world. The most impressive sentence Professor Lee told me is that laboriousness leads to capability and capability invites heavier responsibility, and this teaching has become an important motto in my life. I also appreciate Professors Hong-Wen Wang and Jy-Shan Hsu, who served as the committee members for my master's thesis defense and made valuable comments and provided useful feedback to improve my thesis. I also want to thank many graduated senior lab mates who had joined the liquid crystal (LC) research group and led me to get deeply involved in this intriguing area, allowing me to find the beauty of LC photonics. I would like to show gratitude especially to Kevin Wu, who had graduated from the LC lab and then served as a full-time research assistant. He gave me many suggestions and help within my area of exploration. In addition, I would like to show courtesy to my lab mates, Bo-Ru Jian, Jonny Liu, Wallace Lin, Jason Lin, Ricardo Kou, Timothy Lin, and Ray Wang, whose seniorities are the same as mine. Because of many mutual discussions with them, my research could progress with smooth sailing. Moreover, I am much obliged to my junior lab mates, Wei-Ting Lin, Allen Chen, and Aaron Archibald, for assisting me to conduct some experiments. With the exception of Wei-Ting Lin, they have just touched this area for a short time. Also, I want to thank Aaron Archibald for his help in proofreading my thesis so that the content could be clearer and more coherent. Furthermore, I am obliged to all undergraduate students who took the research-topic course in this lab. Both Samuel Huang and Roy Chang participated in the industrial project sponsored by Metal Industries Research & Development Centre (MIRDC) in an effort to improve our VHR & RDC instrument. Besides, Samuel Huang was my important right-hand man for my research; I want to show my highest appreciation for him. I would like to show the highest respect to my parents. They respected my decision to pursue depth of knowledge in the field of nanotechnology, which is totally different from my earlier training in electrical engineering, and they continued to offer financial support as well. They encouraged me as I met the bottleneck during this period and provided good suggestions to me. I would also like to acknowledge my older sister and younger brother for their support, which was invaluable to me. They stimulated me as I encountered many difficulties in my life and helped me solve them without expectation of return. In the end, I would like to thank again all the people who have assisted me in my life. Because of them, I have been able to do all things favorably and successfully.