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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Two-step-route to Ag-Au nanoparticles grafted on Ge wafer for extra-uniform SERS substrates
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Two-step-route to Ag-Au nanoparticles grafted on Ge wafer for extra-uniform SERS substrates

机译：两步法制备接枝到Ge晶片上的Ag-Au纳米颗粒，用于超均匀SERS衬底

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A two-step galvanic displacement reaction was employed to synthesize Ag-Au nanoparticles grafted on Ge wafer using different equilibrium potentials. The Ge wafer was employed to reduce silver ions and grow Ag nanoparticles first, and then to reduce gold ions and to grow Au nanoparticles between the gaps of Ag nanoparticles. When they were employed as SERS substrates to detect 200 random spots, the lowest relative standard deviation (RSD) to our knowledge, of less than 7% was obtained by using Rhodamine 6G (1 x 10(-9) M) as probe molecules in the aqueous detection. Crystal violet solution (1 x 10(-8) M) was also detected with an ultra low RSD of less than 8%. The result of the electric field distribution by the finite difference time domain simulation further explained the distinguished sensitivity and uniformity of these substrates. The high uniformity and reproducibility of this substrate may benefit quantitative surface enhanced Raman scattering (SERS) detection in the field of biology in future.
机译：采用两步电流置换反应，以不同的平衡电位合成接枝到Ge晶片上的Ag-Au纳米粒子。 Ge晶片用于首先还原银离子并生长Ag纳米颗粒，然后还原金离子并在Ag纳米颗粒的间隙之间生长Au纳米颗粒。当将它们用作SERS底物以检测200个随机斑点时，通过使用罗丹明6G（1 x 10（-9）M）作为探针分子，据我们所知，最低相对标准偏差（RSD）小于7％。水性检测。还检测到结晶紫溶液（1 x 10（-8）M），RSD低于8％。有限差分时域模拟的电场分布结果进一步解释了这些基板的显着灵敏度和均匀性。这种底物的高度均匀性和可重复性可能会在未来的生物学领域中有益于定量表面增强拉曼散射（SERS）检测。

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