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題名 | Optical Properties of Host(SBA-15)-guest(Agl) Composite Materials= |
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作者 | 黃聖言; 簡淑華; 楊逸涵; 林進東; 陳逸聰; 黃良平; Hwang, Dennis W.; Chien, Shu-hua; Yang, Yi-han; Lin, Jin-dong; Chen, Yit-tsong; Hwang, Lian-pin; Kamalakar,G.; Zhai,Q. Z.; |
期刊 | Journal of the Chinese Chemical Society |
出版日期 | 20030200 |
卷期 | 50:1 2003.02[民92.02] |
頁次 | 頁59-64 |
分類號 | 346.01 |
語文 | eng |
關鍵詞 | Optical property; SBA-15 host; AgI guest; |
英文摘要 | Nanoclusters AgI have been prepared in the channels of SBA-15 molecular sieve host, and the host-guest nanocomposite materials were prepared by a heat diffusion method. The (SBA-15)-AgI host-guest nanocomposites were characterized by powder X-ray diffraction analysis, nitrogen adsorption-desorption isotherms at 77 K, and solid-state diffuse reflectance absorption spectra. The decrease in surface area, pore diameter, and pore volume showed the existence of silver iodide clusters in the channels of SBA-15 host. X-ray diffraction illustrates that the framework of the SBA-15 remained in the host-guest composites of (SBA-15)-AgI. As the guest loading decreases, a blue-shift was observed in the diffuse reflectance spectra. This shows that the guest existed in the channels of SBA-15 and a quantum confinement effect emerged. The photoluminescence (PL) spectra show that the PL at ~2.38 eV, associated with the hydrogen-related species, decreases substantially after the loading of AgI in SBA-15. The decrease of the PL indicates the reduction of the hydrogen concentration on the pore surface of SBA-15 after the loading of AgI guest. The intensity decrease of the self-trapped exciton (STE) band at 2.76 eV also suggests a hindrance for generating the excitons upon adding the AgI guest into the SBA-15 host. |
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