金奈米團簇,碳奈米點與硒化鎘-金屬複合物的光誘導載子動力學之研究

因為獨特的光學特性和廣泛的應用性, 金奈米團簇,碳奈米點與硒化鉻-金屬複合物最近已經引起了廣泛和熱烈的討論。儘管已有許多關於合成和應用方面的研究,但這些材料的一些基本物理機制仍然是尚未釐清.在本論文中,我們量測了螢光隨溫度的變化來探討了金奈米團簇與碳奈米點的螢光來源還有結構上的討論,我們發現在兩種材料的螢光中,都有兩種不同的放光機制分別來自材料中不同的結構。另外我們也用了時間單光子計數系統,上轉換技術和瞬態吸收光譜儀來研究了每個材料中的載子動力學。我們發現了較弱的聲子和電子之間的作用力,同時也發現了在金奈米團簇中有延遲螢光的存在。最後在硒化鉻-金屬複合物的部分,我們展示了比起硒化鉻-金,在硒化鉻-鉑上有較快的電子轉移時間,這是因為不同金屬有不同的費米能階所以在接在硒化鉻上之後會有不同的能階調整。

關鍵字

金奈米團簇；碳奈米點；硒化鉻

並列摘要

Recently, Au25 nanoclusters, Carbon nanodots and CdSe-Metal composites have drawn considerable research interest due to their unique properties and potential applications. Even some significant advances in their synthesis methods and applications have been reported, some basic mechanisms of them still remain unclear. In this study, we investigated the temperature-dependent luminescence of Au25 nanoclusters and Carbon nanodots to study the origin of the fluorescence and the correlation with their structure. We found that both fluorescence of Au25 nanoclusters and Carbon nanodots are origined from two diffirent structure (two bands). We also studied carry dynamics of each material by TCSPC, up-conversion technology and transient absorbtion technology. We found weak electron-phonon interaction in both Au25 nanoclusters and Carbon nanodots and delay fluorescence in Au25 nanoclusters. In Cdse-metal composites, we demonstrated that charge transfer in Cdse-pt is faster than CdSe-Au because of the band alignment between the semiconductor and metal tip.

並列關鍵字

nanoclusters ； Carbon nanodots

參考文獻

1. Yuan, X.; Yeow, T. J.; Zhang, Q.; Lee, J. Y.; Xie, J., Highly luminescent Ag+ nanoclusters for Hg2+ ion detection. Nanoscale 2012, 4 (6), 1968-1971.

2. Yan, L.; Cai, Y.; Zheng, B.; Yuan, H.; Guo, Y.; Xiao, D.; Choi, M. M. F., Microwave-assisted synthesis of BSA-stabilized and HSA-protected gold nanoclusters with red emission. Journal of Materials Chemistry 2012, 22 (3), 1000-1005.

3. Jin, Y.; Sun, J.; Zhang, J., 11-Mercaptoundecanoic Acid-Directed Facile Synthesis of Water-Soluble Fluorescent Au Nanoclusters and Their Use as Probes for Sensitive and Selective Detection of Cr3+. Journal of Materials Chemistry C 2013, 1, 138-143.

4. Liu, C. L.; Liu, T. M.; Hsieh, T. Y.; Liu, H. W.; Chen, Y. S.; Tsai, C. K.; Chen, H. C.; Lin, J. W.; Hsu, R. B.; Wang, T. D., In vivo Metabolic Imaging of Insulin with Multiphoton Fluorescence of Human Insulin–Au Nanodots. Small 2012.

5. Chen, H.; Li, S.; Li, B.; Ren, X.; Mahounga, D. M.; Cui, S.; Gu, Y.; Achilefu, S., Folate-Modified Gold Nanocluster as a Near-Infrared Fluorescent Probe for Tumor Imaging and Therapy. Nanoscale 2012, 4, 6050-6064.

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金奈米團簇,碳奈米點與硒化鎘-金屬複合物的光誘導載子動力學之研究

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