奈米金螢光團簇之光性研究

Optical Studies in Fluorescent Gold Nanoclusters

林子能(Tz-Neng Lin)

指導教授 ： 沈志霖

中原大學/理學院/物理研究所/碩士(2011年)

https://doi.org/10.6840/CYCU.2011.00076

摘要

本文利用X射線光電子能譜來研究接枝上二氫硫辛酸螢光金奈米團簇之束縛能，藉以證明螢光金奈米團簇之紅色螢光，為披覆上二氫硫辛酸此硫醇基後，形成金-硫鍵結後所產生。此外，我們觀測到披覆二氧化矽之紅色螢光金奈米團簇具有上轉換螢光光譜。利用速率方程式來擬合隨著溫度變化下之上轉換螢光強度，發現到具有內部載子轉移的現象。根據功率定理，擬合隨著功率變化下之上轉換螢光強度，推測其螢光機制為雙光子吸收所產生。

關鍵字

金奈米團簇 ； X射線光電子能譜 ； 螢光

並列摘要

In this thesis, we used the X-ray photoelectron spectroscopy (XPS) to study the binding energy of fluorescent gold nanoclusters (NCs) with capping dihydrolipoic acid (DHLA). We demonstrate that the red fluorescent of gold NCs are attributed to sulfur atoms bound to gold surface as thiolate species. In additon, we study the mechanism of up-conversion photoluminescence (PL) in red fluorescent gold NCs by silica coating. According to the dependence of the excitation density, we suggest that the up-conversion PL is generated by the two-photon absorption process. Rate equations were used to explain the inter-carrier transfer in the temperature dependence of the up-conversion PL studies.

並列關鍵字

gold nanoclusters ； X-ray photoelectron spectroscopy ； photoluminescence

參考文獻

23. 黃正凱，私立中原大學化學工程學系研究所碩士論文 (2008)

3. M. D. Austin, C. W. Warren Chan, N. B. Sangeeta, Nano letters 4, 11-18 (2004).

6. S. Link, M. A. El-Sayed, J Phys Chem B 103, 8410-8426 (1999).

9. J. J. Storhoff, R. Elghanian, R. C. Mucic, C. A. Mirkin, R. L. Letsinger, J. Am. Chem. Soc. 120, 1959 (1998).

11. J. Zheng, C. Zhang, R. M. Dickson, Phys Rev Lett 93, 077402 (2004).