材料科学
拉曼光谱
硅
纳米颗粒
图层(电子)
聚苯乙烯
基质(水族馆)
光电子学
光学
罗丹明6G
分析化学(期刊)
纳米技术
荧光
复合材料
聚合物
化学
地质学
物理
海洋学
色谱法
作者
Junfan Chen,Li Tao,Jie Zhou
摘要
A structured SERS substrate with high uniformity and sensitivity was fabricated orderly by hydrophilizing the monocrystalline silicon substrate, self-assembling a layer of dense polystyrene (PS) microsphere array on the silicon, and depositing a layer (5 nm, 10 nm, 20 nm, 30 nm or 50 nm) of silver film. Rhodamine 6G (R6G) was used as a probe to characterize the performance of Raman enhancement. Experimental results show that our sample with deposition of a 5 nm silver film (PS-Ag-5) can obtain a large number of spatially distributed local electromagnetic field hot spots, with an enhancement factor of over 10 8 , which is several orders of magnitude higher than that of other samples. The sensitivity of PS-Ag-5 to the concentration of probe molecules and the optical enhancement effect of PS microspheres were also analyzed. This novel structured substrate can achieve considerable uniformity, and the calculated relative standard deviation (RSD) of the characteristic peak at 1650 cm -1 is approximately 8%.
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