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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/6077

    Title: 超分子發光二極體相容性、分子運動性與光性之研究;Supramolecular structure and optical properties of MEH-PPV and TiO2 nanoparticle/tube composite material
    Authors: 王旭生;Hsu-Shen Wang
    Contributors: 化學研究所
    Keywords: 共軛高分子;高分子發光二極體;有機無機複合材料;高分子;PLED;polymer light emitting diode;nano-composite material;hybride material
    Date: 2004-06-16
    Issue Date: 2009-09-22 10:12:52 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 中文摘要 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形成異核超分子結構複合材料,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增進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與Poly(FV) [poly(9,9-di-n-octylfluorenyl-2,7-vinylene)]以及其他PPV系列之共軛高分子進行混摻。並藉由不同的界面活性劑修飾二氧化鈦奈米粒子表面以增進與高分子MEH-PPV 、Poly(FV)溶液二者相容性,以克服二氧化鈦於高分子溶液中不佳的分散性質。利用SEM探討二氧化鈦奈米顆粒與奈米管表面修飾前後在高分子內之分散排列的情形。發現二氧化鈦於高分子溶液中之分散度有效率的提升,並且呈現出長距有序的排列(long-range order arrangement)。IR光譜中顯示因奈米顆粒與奈米管在有效分散下之long-range order 排列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,發現其最大吸收波長未受改變但PL放光強度卻有明顯的增加。除此,更進一步探討混摻前後導致其光學特性改變的機制。並於DSC圖譜中探討二氧化鈦奈米顆粒與奈米管影響對高分子物性的影響。除此,我們更利用膠態NMR探討介面活性劑與二氧化鈦奈米顆粒與奈米管之間的作用力,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並高度交纏的情形下TiO2 奈米粒子與奈米管有效的影響高分子側鏈的運動。XPS(X-ray photoelectron spectroscopy)光譜則顯示出 Ti2p3/2 或是C1s能階之電子束縛能在複合材料時均是增加的情形,此跡象及顯示出共軛高分子與二氧化鈦奈米粒子與奈米管之間強烈的交互作用,並直接證實IR光譜與XPS光譜的實驗結果。 Abstract Organic and inorganic composites are often used to improve physical properties. Previous studies shows when the nano-size inorganic moiety is arranged in long range ordere, novel ionic and electronic conductive behaviors can be observed. Present study gives the optical properties of a family of organic/inorganic composites where nano-size Titanium dioxide of different shapes (particle and tube) is well dispersed in the conjugated polymer (MEH-PPV). Taking advantage of the semi conductive properties; high dielectric properties, TiO2 nano particle and nano tubes facilitated hole/electron pair formation, which leads to photo-induced/excitation mechanism. As a result, the optical properties of conjugated polymers are substantially improved. TiO2 nano particle were synthesis by sol-gel processes, which upon further treatment of strong base at elevated temperature converts into TiO2 nano-tube. TEM characterization shows these particles and tubes become isolated due to the modification with different surfactants. SEM images showed the miscibility of TiO2 (tube and particle) with conjugated polymer (MEH-PPV) are substantially improved with surfactant modified TiO2, furthermore they are regularly ordered with long range arrangement. IR spectrum reveals electrostatic force increases with this long range ordered arrangement from the inorganic moiety. Microscopic interactions between surfactant and TiO2 particles are clearly illustrated by Gel-phase NMR. Highly dispersed and long range ordered semi-conducting TiO2 nano particle and nano tubes in MEH-PPV are expected to generate monumental physical property changes. The optical properties of this novel composite material were investigated by UV and PL spectra and a new energy transfer mechanism in these nano-composite materials is proposed.
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