發光高分子奈米線之合成與性質探討; The photoluminescence of MEH-PPV in mesoporous zeolites

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题名:	發光高分子奈米線之合成與性質探討;The photoluminescence of MEH-PPV in mesoporous zeolites
作者:	潘苡秀;Yi-Hsiu Pan
贡献者:	化學研究所
关键词:	發光高分子;奈米線;奈米;photoluminescence;polymer;nano;nanowire
日期:	2003-07-10
上传时间:	2009-09-22 10:10:29 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	由於奈米結構材料，其性質如光學、磁性、熱傳、擴散以及機械性質，隨著粒徑大小不同而有所差異，使得其各種性質逐漸受到的重視。奈米結構材料在空間上可分零維、一維以及二維奈米材料，而一維奈米材料是指直徑在1~100nm大小的管狀、線狀或柱狀材料。本實驗利用具有奈米孔徑的宿主MCM-41，來製備共軛高分子MEH-PPV奈米線。再以XRD、IR、TGA、UV/Vis、螢光光譜、N2吸附、固態NMR以及ESCA來探討共軛高分子奈米線是否形成及其聚集度對發光特性的影響。由實驗結果發現MEH-PPV經MCM-41宿主分散後其起始吸收和起始放光波長皆往短波長位移，綜合各種數據顯示在MCM-41孔隙中，而TEM證明的確有奈米線的形成，但在MCM-41孔隙內之MEH-PPV奈米線可能不發光；此外只要少量(3wt.%)的MEH-PPV分散在未煅燒的MCM-41上，即可使其螢光強度比純MEH-PPV強。所以MCM-41的功能除了作為宿主來合成MEH-PPV奈米線外，也可經由分散效用來增加MEH-PPV之螢光效率。 The present work describes the preparation and characterization of electroluminescence polymer MEH-PPV inside the mesoporous channels of MCM-41 and SBA-15 silicate molecular sieves. There is no distinguished feature was observed between zeolites and MEH-PPV loaded zeolites in both SEM and TEM micrographs. Nitrogen adsorption/desorption isotherms show that MEH-PPV loaded MCM-41 and free MCM-41 has the similar pore size, but the surface area of MEH-PPV loaded MCM-41 is smaller than that of free MCM-41. Diffusion reflectance UV/Vis spectra and Fluorescence spectra of the MEH-PPV loaded zeolite powder showed a blue shift with respect to the free MEH-PPV powder, consistent with the quantum size effect of the dispersed MEH-PPV. The luminescence efficiency of the polymer dispersed in uncalcined MCM-41 is higher than that dispersed in calcined MCM-41. For example 3wt.% MEH-PPV in uncalcined MCM-41 has the highest luminescence efficiency. This may imply that some MEH-PPV has encapsulated in the pores of calcined MCM-41 and MEH-PPV inside the pores of zeolites may have lower quantum efficiency. MEH-PPV in zeolite has better thermal stability compared to free MEH-PPV. Interestingly, when the MEH-PPV loaded MCM-41 was heated at 900℃ in air, the polymer did not combust totally to H2O and CO2, instead, it forms a carbide-like material with large surface area and high thermal stability.
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