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  • 學位論文

中孔薄膜型二氧化鈦─有機無機複合材料合成與研究

Synthesis of mesoporous titanium thin film / organic and inorganic composite materials

指導教授 : 牟中原

摘要


利用中孔洞材料將螢光染料分子填滿於孔洞中,是近十年來備感興趣的研究之一。此乃因中孔洞材料提供了限制空間可助於螢光分子的排列以及穩定,提供複合材料良好的光電性質。規則型中孔洞材料中提供了材料高表面積的性質,而銳鈦曠(anatase)結晶性之二氧化鈦是最有光活性,因此,具有銳鈦曠高活性晶形的規則中孔型二氧化鈦材料,被視為最有潛力的光電材料。本論文研究方向主要分為兩部分,第一部分是利用帶有(polyethylene oxide)親水端的界面活性劑Brij98作為模板,嘗試利用一步驟的合成條件,合成具有銳鈦曠結晶性的階層式中孔型材料,並成功的以旋轉塗佈的方式將複合材料塗佈成薄膜,透過X-射線粉末繞射儀以及穿透式電子顯微鏡相關數據,鑑定孔道的性質,利用掃描式電子顯微鏡鑑定膜的形貌。 第二部分則是利用螢光型界面活性劑作為模板,同樣應用在中孔型二氧化鈦複合材料合成。螢光型界面活性劑係利用有機合成方式,得到帶有發光團且親水端為(polyethylene oxide)的非離子型界面活性劑。利用本研究的合成條件,可以直接得到具有晶相的階層式中孔型材料,藉著螢光界面活性劑的共軛系統,利用紫外光/可見光光譜儀以及螢光光譜儀相關數據,探討處於限制空間下的螢光行為。

並列摘要


Mesoporous titania materials are of considerable interest as they usually show higher surface contacts with organics and much more uniform structure compared with randomly organized forms of nanocrystalline titania. The nanocrystalline form even has many potential applications, such as electrochromic devices, photo conductors, photo catalysts and sensor. Herein, we tried to prepare the titania mesostructured nanocomposites using block copolymers as pore-directing agents surfactant via sol-gel process. In the first part, we tried to develop a method which could prepare nanocrystalline organic/TiO2 mesostructured composites in one step. We used the Brij type-block copolymer surfactant as template to synthesize titania mesostructured nanocomposites. Such materials were obtained in hierarchical structure which anatase nanocrystals were in framework. We successfully prepared these materials as thin film by spin-coating. The physical properties of the nanocomposites were characterized by X-ray Diffraction (XRD), transmission electron microscopy (TEM) and Grazing incidence small angle X-ray Scattering (GISAXS). In the second part, fluorescent surfactants were successfully synthesized via Sonogashira coupling reaction. The fluorescent surfactants were designed based on the structure of Brij- type surfactant. The hydrophilic parts were composed of block copolymer. The hydrophobic parts were composed of fluorescent dyes and long chains. Based on part 1 conditions, we could straightly synthesize a hierarchical structure─nanocrystalline organic / titania mesostructured composites. Photoluminescence (PL) behavior and physical properties of the resulting materials were fully characterized by XRD, UV-Vis, PL, TEM, SEM, and GISAXS.

參考文獻


(29)Yin, S. C.; Song, B.; Liu, G. Q.; Wang, Z. Q.; Zhang, X. Langmuir 2007, 23, 5936.
(12)Wang, Y. Q.; Tang, X. H.; Yin, L. X.; Huang, W. P.; Hacohen, Y. R.; Gedanken, A. Adv. Mater. 2000, 12, 1183.
(2)Naim, B. A Hydrophobic Interaction, Plnnum Press, New York 1980.
(3)Mitchell, D. J. N., B. W. J. Chem. Soc. Farad. Trans. II 1981, 77, 601.
(9)Imperor-Clerc, M.; Davidson, P.; Davidson, A. J. Am. Soc. Chem. 2000, 122, 11925.

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