| Autor: |
Rui Hui He, Hai Lu Fan, Zhi Long Zhao, Zhuo Hao Lin, Mei Zhang, Xin He |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of Nano Research. 33:1-10 |
| ISSN: |
1661-9897 |
| DOI: |
10.4028/www.scientific.net/jnanor.33.1 |
| Popis: |
In this work, the effects of Ag nanoparticles or Ag-PVP nanocomposites on the fluorescence properties of rhodamine B and fluorescein were investigated. The fluorescence intensities of the dyes could be largely enhanced by Ag nanoparticles with various concentrations. Moreover, the intensities were further increased by Ag-PVP nanocomposites. The results show that the maximum enhancement ratio of 36.5 fold is achieved for rhodamine B in the presence of 2% Ag-PVP nanocomposites, as well as 4.37 fold for fluorescein with 5% Ag-PVP nanocomposites. The enhancement is believed to mainly be originated from the increased excitation rate of the dyes due to the local electromagnetic field which is improved by the interaction of light with Ag nanoparticles. The further fluorescence enhancement of the dyes by Ag-PVP nanocomposites is attributed to the effective separation of Ag nanoparticles from the dyes by PVP molecules. Additionally, the difference in the enhancement ratio of two dyes was also discussed. The lower quantum yield of the dye, as well as higher overlapped degree between Ag nanoparticles and the absorption of dye result in the larger enhancement ratio. The research could be meaningful for improving the sensitivity of rapidly medical or biological assays. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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