کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5429112 | 1397335 | 2012 | 9 صفحه PDF | دانلود رایگان |
The plasmon resonance of metallic Au/Ag nano-alloys in the colloidal state was tuned from 400Â nm to 500Â nm using a laser irradiated technique performed directly in the liquid state. Interesting optical nonlinearities, trapping effects and spectroscopic enhancements were detected by modifying the gold molar fraction in the nano-alloys. In particular a reduction of the limiting threshold was observed by increasing the gold amount. The SERS activity of the Au/Ag alloys was tested in liquid and in solid state in presence of linear carbon chains as probe molecules. The increased Raman signals for nanoparticles with different Au/Ag atomic ratio are presented. Finally, studies and prospects for optical and Raman tweezers experiments are discussed.
⺠Synthesis of contaminant-free Au-Ag composite nanocolloids by PLA. ⺠Reduction of optical limiting threshold by increasing the Au content. ⺠SERS activity on the Au/Ag nanoalloys probed with LCCs. ⺠SERS optical trapping of individual nanoalloy-LCCs nanoaggregates.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 113, Issue 18, December 2012, Pages 2490-2498