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Growth of branched gold nanoparticles on solid surfaces and their use as surface-enhanced Raman scattering substrates

机译：支链金纳米颗粒在固体表面上的生长及其作为表面增强拉曼散射基质的用途

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摘要

Branched gold (Au) nanoparticles (NPs) were synthesized directly on surfaces of three different supports (silicon, glass, indium tin oxide (ITO)) by following a "seed-mediated" method. Growth of the nanostructures in high yield and all with branched morphology was achieved on all surfaces. Nanostructures with desired characteristics were synthesized by determining the optimum seed size (8 nm Au nanospheres) and pH (3.00) of the growth solution. The Au NPs synthesized under these conditions have branched morphologies with average sizes of ca. 450 nm and are well dispersed on the support surface. Surface-enhanced Raman scattering (SERS) spectroscopy studies were performed using Rhodamine 6G (R6G) as a probe molecule. The results revealed strong SERS activity of the synthesized Au NPs for the detection of R6G in concentrations as low as 1 nM with an enhancement factor (EF) estimated as greater than 8 orders of magnitude.
机译：遵循“种子介导”方法，在三种不同载体（硅，玻璃，铟锡氧化物（ITO））的表面上直接合成了支化金（Au）纳米颗粒（NPs）。在所有表面上实现了高产率且均具有分支形态的纳米结构的生长。通过确定生长溶液的最佳种子尺寸（8 nm金纳米球）和pH（3.00），可以合成具有所需特性的纳米结构。在这些条件下合成的Au NPs的分支形态约为平均大小。 450 nm，并且很好地分散在载体表面上。使用罗丹明6G（R6G）作为探针分子进行了表面增强拉曼散射（SERS）光谱研究。结果显示，合成的Au NP具有很强的SERS活性，可检测低至1 nM浓度的R6G，增强因子（EF）估计大于8个数量级。

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