頁籤選單縮合
題名 | Rich Photoluminescence Emission of SnO₂-SiO₂ Composite Aerogels Prepared with a Co-fed Precursor Sol-gel Process=共前驅物溶膠-凝膠法製備二氧化錫-二氧化矽複合氣凝膠之螢光發光研究 |
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作者 | 魏得育; 呂世源; 張育誠; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 38:5/6 2007.09-11[民96.09-11] |
頁次 | 頁477-481 |
分類號 | 460.02 |
關鍵詞 | 共前驅物溶膠-凝膠法; 二氧化錫-二氧化矽複合氣凝膠; 螢光發光; Silica; Tin oxide; Composite aerogel; Photoluminescence; Sol-gel; |
語文 | 英文(English) |
中文摘要 | 本研究成功地經由共前驅物的試,經過溶膠-凝膠反應製備出二氧化錫-二氧化矽複合氣凝膠。採用不同溫度的熱處理,可於二氧化矽介孔結構中,得到不同程度結晶性的二氧化錫奈米晶,在螢光發光上可以獲得具有廣波長範圍的發光表現。由螢光發光圖譜中得到六個不同波長的發光波峰,分別為310、346、387、432、476及522 nm,其中346 nm來自於二氧化錫近能隙發光,310 nm與476 nm為二氧化矽氧缺陷所造成之發光。387 nm、432 nm及522 nm皆上不生於二化錫不同缺陷所造成的缺陷發光,此缺陷發光,隨著熱處理溫度的上升,晶體結構趨於完整而會有不同程度的銳減。 |
英文摘要 | Tin oxide-silica composite aerogels were successfully prepared with a co-fed precursor sol-gel process. The crystallinity of the tin oxide nanoparticles, embedded in the mesopporous SiO₂ network, was improved with increasing the post-reaction thermal treatment temperature. The composite aerogels exhibited a rich photoluminescence (PL) emission contributed by both SnO₂ and SiO₂. The PL peak of 346 nm was from the near band edge emission of the tin oxide nanoparticles, and the ones located at 310 and 476 nm were attributable to the oxygen deficiencies of the silica network. Three more emission peaks, 387, 432, and 522 nm, were observed, with the 387 nm peak contributed by the oxygen vacancies Vo++, the 432 nm peak by the Sn interstitials, and the 522 nm peak by the oxygen vacancies Vo+, respectively, of the tin oxide nanoparticles. The intensities of these three defect level emissions were found decreased, as compared to that of the near band edge emission, with increasing the postreaction thermal treatment temperature as the tin oxide crystallinity improved. |
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