利用超音波結晶法降低小分子有機半導體分子的昇華點 以及藉由蛋殼膜增進AlQ3奈米管的光激發螢光強度; Sublimation Point Depression of Small-Molecule Semiconductors by Sonocrystallization & Photoluminescence Intensity Enhancement of AlQ3 Nanotubes by Eggshell Membrane

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题名:	利用超音波結晶法降低小分子有機半導體分子的昇華點以及藉由蛋殼膜增進AlQ3奈米管的光激發螢光強度;Sublimation Point Depression of Small-Molecule Semiconductors by Sonocrystallization & Photoluminescence Intensity Enhancement of AlQ3 Nanotubes by Eggshell Membrane
作者:	張世佳;Shih-Chia Chang
贡献者:	化學工程與材料工程研究所
关键词:	五環素;昇華點降低;蛋膜;8-羥基喹啉鋁;eggshell membrane;AlQ3;PL;pentacene;sublimation point depression
日期:	2009-06-23
上传时间:	2009-09-21 12:31:19 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	在本論文中已成功的將五環素(pentacene)與8-羥基喹啉鋁(Alq3)的昇華點個別降低約40°C和120°C，所使用的方法是把五環素(pentacene)與8-羥基喹啉鋁(Alq3)分散在差的溶劑，例如：水，並裝在10mL的透明玻璃瓶，利用頻率20kHz、電壓1500V的超音波振盪器，在-13oC環境下震盪10分鐘。超音波結晶法在低溫的環境溫度下，造成五環素(pentacene)粉末轉變為具有高晶格能的粉體，另外，也造成8-羥基喹啉鋁(Alq3)粉末成為穩定α-form與界穩定ε-form的混和物，因此可降低昇華點。然而我們也發現到表面能與不純物並不是影響昇華點下降的主因。因為加熱表面的輻射熱傳播速率從Stefan-Boltzmann law可知是與溫度乘四次方正比，因此若可降低昇華點溫度，則在製作有機發光二極體(OLEDs)、有機薄膜電晶體(OTFTs)和太陽能電池(PV cells)製作元件時可大大降低熱損耗成本。另一方面，另用蒸鍍法將8-羥基喹啉鋁(Alq3)在沸水煮3分鐘的蛋殼外膜、沸水煮15分鐘的蛋殼外膜與溶解的蛋殼外膜蛋白質薄膜上，長出約800 nm長、150 nm寬的8-羥基喹啉鋁(Alq3)奈米管。經由ESCA分析得知，沸水煮過的蛋殼外膜與溶解的蛋殼外膜蛋白質薄膜都具有環酐鍵結，O=C-O-C=O，與C=N鍵結。這些鍵結提供更多的成核位置給8-羥基喹啉鋁(Alq3)的喹啉配位基。然而表面擴散模型說明了AlQ3分子會隨著奈米管的表面做長距離的移動，藉著接觸到最外層的管壁逐漸延伸管長，同時增加管壁厚，亦稱為”lip-lip”相互作用。因此8-羥基喹啉鋁(Alq3)可以在單位體積中的單位表面積上長出密度更高的8-羥基喹啉鋁(Alq3)奈米管，也令其光激發螢光量測強度明顯增加。 The sublimation temperature of pentacene and AlQ3 were successfully reduced for around 40°C and 120°C by the dispersed pentacene and AlQ3 in a poor solvent, like water, by insonating in a 10 mL scintillation vial with output frequency of 20 kHz, a voltage of 1500 V, and insonation time for 10 min at -13oC. Sonocrystallization made the pentacene powders with high lattice energy, and AlQ3 powders of the mixture of stable α-form and metastable ε-form under a low bulk temperature, therefore, the sublimation point was decreased. However, surface energy and impurities had nothing to do with the sublimation point depression. Because of the total radiant-heat-transfer rate between heated surfaces is proportional to the fourth power of the absolute temperature according to the Stefan-Boltzmann law, the reduction of the heating and cooling duty of the vapor-phase deposition method for the manufacturing of organic light emitting diodes (OLEDs), organic thin film transistors (OTFTs), and photovoltaic (PV) cells could be made possible. On the other hand, about 800 nm long, and 150 nm wide AlQ3 nanotubes were thermally deposited and grown on the 3-min boiled outer shell membrane (OSM), 15-min boiled OSM, and soluble eggshell membrane protein (SEP) film. The ESCA analysis showed that the boiled eggshell membrane and SEP possessed the cyclic anhydrides, O=C-O-C=O, and C=N bonds that provided more nucleation sites for the quinoline ligands of AlQ3 molecule. Surface diffusion model showed the AlQ3 molecules migrated over large distance along the nanotubes surface, reaching the open layer edges and extending the nanotubes, then this layers may propagated one after another with edges coupled by “lip-lip” interaction. This mechanism caused a higher population density of AlQ3 nanotubes and increased the surface area per unit volume to increase the PL emission intensity.
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