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Modification of the optical characteristics of Rhodamine B dye with different concentrations using gold nanorods
Journal of Modern Optics ( IF 1.3 ) Pub Date : 2020-01-01 , DOI: 10.1080/09500340.2019.1707892
Davood Razzaghi 1 , Mohammad Barzan 1 , Morteza Sasani Ghamsari 1 , Atamalek Ghorbanzadeh 2 , Ata allah Koohian 2 , Narges Ajamgard 2
Affiliation  

ABSTRACT The optical absorption and fluorescence of Rhodamine B dye solution with different dye concentrations, from 0.1 to 40 µM, in the presence of gold nanorods were studied. Colloidal gold nanorods were characterized by UV–Visible spectrophotometry and Transmission Electron Microscopy. Rhodamine B dye absorbance with and without gold nanorods was shown to be approximately constant, due to the dominance of the absorbance term of longitudinal surface plasmon resonance of gold nanorods. The fluorescence peak of dye-nanorods mixture with respect to that of pure dye was blue shifted. By increasing the dye concentrations, the energy transfer efficiency between the dye-nanorod pair was increased and, as a result, the fluorescence quantum yield was decreased. The results of the spectral overlapping of the absorption and the fluorescence spectra of RhB dye solution, with and without gold nanorods, matched well with the calculated energy transfer efficiency.

中文翻译:

使用金纳米棒改变不同浓度罗丹明 B 染料的光学特性

摘要研究了在金纳米棒存在下,具有不同染料浓度(0.1 至 40 µM)的罗丹明 B 染料溶液的光吸收和荧光。胶体金纳米棒通过紫外-可见分光光度法和透射电子显微镜进行表征。由于金纳米棒的纵向表面等离子体共振的吸收项占主导地位,因此显示有和没有金纳米棒的罗丹明 B 染料吸光度近似恒定。染料-纳米棒混合物的荧光峰相对于纯染料的荧光峰蓝移。通过增加染料浓度,染料-纳米棒对之间的能量转移效率增加,结果荧光量子产率降低。
更新日期:2020-01-01
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