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Laying down of gold nanorods monolayers on solid surfaces for surface enhanced Raman spectroscopy applications
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2021-11-09 , DOI: 10.1039/d1cp02497c
Haidong Zhao 1, 2, 3 , Katsuhiro Isozaki 2, 4 , Tomoya Taguchi 2 , Shengchun Yang 3 , Kazushi Miki 2
Affiliation  

Laying-down gold nanorods (GNRs) of a monolayer immobilized on a solid substrate was realized with a hybrid method, a combination of three elemental technologies: surface modification, electrophoresis, and solvent evaporation. The self-assembly of CTAB-protected GNRs in the solution was induced by 0.05 mM of EDTA. The assembled GNRs were deposited in a laying-down form on the solid surface during the hybrid method. The final coverage was over 71% on the substrate with an area larger than 0.6 cm2. The spacing between the sides of the GNRs was fixed to be 4.6 ± 0.9 nm by the thermal annealing-promoted crystalline packing of the bilayer of CTAB salt-bridged with EDTA. The obtained laying-down GNRs of a monolayer on the gold substrate show a small shift of the transverse LSPR around 550–570 nm (with a width of around 100 nm) and a large red shift of the longitudinal LSPR to be 900–1050 nm (with a width of 500 nm), because of the strong electromagnetic coupling between the GNRs and gold substrate. Therefore it can be used in a wide range of wavelengths for surface enhanced Raman spectroscopy (SERS) applications. The film has a high enhancement factor with 105 for R6G.

中文翻译:

在固体表面铺设金纳米棒单层用于表面增强拉曼光谱应用

通过混合方法实现了固定在固体基底上的单层金纳米棒 (GNR),该方法结合了三种元素技术:表面改性、电泳和溶剂蒸发。溶液中 CTAB 保护的 GNR 的自组装由 0.05 mM EDTA 诱导。在混合方法期间,组装的 GNR 以铺设形式沉积在固体表面上。面积大于 0.6 cm 2的基材上的最终覆盖率超过 71%. 通过热退火促进的 EDTA 桥接 CTAB 盐双层结晶堆积,将 GNR 两侧的间距固定为 4.6 ± 0.9 nm。在金基板上获得的单层沉积 GNR 显示横向 LSPR 在 550-570 nm 附近(宽度约为 100 nm)有一个小偏移,而纵向 LSPR 的红移很大,为 900-1050 nm (宽度为 500 nm),因为 GNR 和金基板之间的强电磁耦合。因此,它可用于各种波长的表面增强拉曼光谱 (SERS) 应用。该膜具有高增强因子,R6G 为10 5
更新日期:2021-11-24
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