Large-scale synthesis of gold dendritic nanostructures for surface enhanced Raman scattering

Large-scale synthesis of gold dendritic nanostructures for surface enhanced Raman scattering
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用于表面增强拉曼散射的金树枝状纳米结构的大规模合成

DOI:
10.1039/c5ce00407a
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发表时间:
2015-05
期刊:
影响因子:
3.1
通讯作者:
R. M. Wang
R. M. Wang
中科院分区:
化学3区
文献类型:
--
作者:
T. Y. Xia;H. Luo;S. G. Wang;J. L. Liu;G. H. Yu;R. M. Wang

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采用聚焦离子束(FIB)技术,通过氢氟酸还原四氯金酸钾(KAuCl 4),在局部处理的硅片上成功地制备了具有尖锐尖端的Au树枝状纳米结构。罗丹明B(RhB)分子在纳米结构基底上的表面增强拉曼散射(Sers)被极大地增强,源自位于树枝状纳米结构上相邻分支之间的纳米间隙处的“热点”。此外,Au树枝状纳米结构作为可回收的Sers基底表现出对探针分子的皮级浓度的超灵敏响应。这项工作表明,可以以相对较低的成本制造具有高度可靠性和再现性的增强型Sers基底,这可以帮助Sers实现其作为一种非常灵敏的痕量分析工具的全部潜力。
Au dendritic nanostructures with sharp tips have been successfully fabricated on a large scale by reducing potassium tetrachloroaurate (KAuCl4) with hydrofluoric acid on a Si wafer locally processed using a focused ion beam (FIB) technique. Surface enhanced Raman scattering (SERS) with Rhodamine B (RhB) molecules on a nanostructured substrate is greatly enhanced, originating from “hot-spots” located at the nanogaps between adjacent branches on dendritic nanostructures. Furthermore, Au dendritic nanostructures as recyclable SERS substrates exhibit an ultrasensitive response to the pico-scale concentration of probe molecules. This work shows that greatly enhanced SERS substrates with a high degree of reliability and reproducibility can be fabricated at a relatively low cost, which could help SERS to realize its full potential as a very sensitive tool for trace analysis.
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