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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6139


    Title: 原位聚合有機無機複合發光二極體 之分散性及光性研究;MEH-PPV and TiO2 nanotube composite PLED prepared by in-situ polymerization
    Authors: 林志柄;Chi-Ping Lin
    Contributors: 化學研究所
    Keywords: 高分子發光二極體;PLED
    Date: 2005-06-10
    Issue Date: 2009-09-22 10:13:50 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 研究中利用二氧化鈦奈米顆粒與奈米管等不同形式(different shapes)的無機奈米粒子與共軛高分子MEHPPV以原位聚合的方式形成異核結構複合材料,以利用二氧化鈦所具有之半導體性質、高介電值與其易受到光的激發後產生電子與電洞對等的性質來探討共軛高分子的發光性質。實驗中利用Sol-Gel方式將二氧化鈦製成奈米顆粒,並進一步利用強鹼處理成為奈米管與利用TEM鑑定結構,其管長約200nm、管徑約30nm。再分別與高分子發光材料MEH-PPV高分子進行混摻。以高分子鏈段成長方式帶開二氧化鈦奈米管及奈米粒子增進分散性質。利用TEM探討二氧化鈦奈米顆粒與奈米管表面在高分子內因此方式所呈現分散排列的情形。發現二氧化鈦於高分子溶液中之分散度有效率的提升。IR光譜中顯示因奈米顆粒與奈米管在有效分散下而使之與共軛高分子鏈間近距離的接觸與高度的交纏而使二者間的靜電作用力加強並進一步影響高分子鏈上苯環與碳氧鍵結的振動情形。使用UV、PL光譜探討高分子發光材料光學特性,發現共軛長度由於受到相鄰的二氧化鈦影響,而因混摻濃度不同影響共軛長度程度不同光譜會有或多或少紅位移的情形。除此,更進一步探討混摻前後導致其光學特性改變的機制。利用固態NMR探討共軛高分子形成複合物時高分子鏈的運動行為,發現在二者極為接近的情形下TiO2 奈米粒子與奈米管有效的影響高分子原本較互相纏繞的情形,而使高分子在二氧化鈦周圍運動性增加。而二氧化鈦由此方式聚合因其不同的構形對發光層表面型態造成影響,也對整個電性產生了變化。此外分析元件對整個二氧化鈦所造成的光誘導性、電荷分離性及載子再結合機率做探討,發現這些因素因為此種作法所造成有機無機空間上分佈的效應而造成對整個光電性質有先後主導及相互平衡的狀態。 Hybrid organic and inorganic materials are a versatile and mild approach which promises enhanced optical, electrical, mechanical thermal and chemical properties. Miscibility of the organic inorganic moieties, necessary for a homogeneous system, becomes the prime issue that challenges the preparation of these materials. This paper demonstrated in-situ polymerization is an effective mean to alleviate the miscibility issues. When the optical active moiety of MEH-PPV is polymerized in TiO2 nano tube and nano sphere suspension, they combine tightly in confined nano domain. The MEH-PPV coated on TiO2 nanotube forms staggered conformation, thus avoids close MEH-PPV stacking to form excimer. Furthermore, the semi conductive properties; high dielectric constants, and photoactive properties of TiO2 nano particle and nano tubes leads to new photo-induced/excitation mechanism. As a result, the optical properties of conjugated polymers are substantially improved. The Photo-induced and recombination processes in MEH-PPV –TiO2 nanocrystal blended structures have been studied as a function of the shape of the titania nanocrystals.
    Appears in Collections:[化學研究所] 博碩士論文

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