Highly ordered Au-Ag alloy arrays with tunable morphologies for surface enhanced Raman spectroscopy
Highly ordered Au-Ag alloy arrays with tunable morphologies for surface enhanced Raman spectroscopy
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DOI：
10.1016/j.cej.2018.03.192
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发表时间：
2018-08
影响因子：
15.1
通讯作者：
Zhezhe Wang;X. Wen;Zhuo-hong Feng;Lin Lin-Lin;Ruihua Liu;Pingping Huang;Guilin Chen;Feng Huang
中科院分区：
文献类型：
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作者：
Zhezhe Wang;X. Wen;Zhuo-hong Feng;Lin Lin-Lin;Ruihua Liu;Pingping Huang;Guilin Chen;Feng Huang
提出了一种结合电化学反应自组装和光刻技术的简单方法，用于可控和可重复地制备高度有序的SERS金银合金阵列。通过改变施加电压和反应时间，可以很容易地调整Au-Ag合金的成核和生长过程，从而获得花状层系纳米结构，由于在多分支的花状结构中，角部和边缘提供了丰富的拉曼“热点”，从而显示出最强的SERS性能。此外，少量Au（12%）的Au- ag合金的SERS最大，这可以导致电荷分离，有利于探针分子吸附到银畴。利用这些花状的Au-Ag合金阵列，本研究可以很容易地检测到浓度低至10−12M的罗丹明6G (R6G)，这在生物传感器和纳米器件的分子水平检测中具有很大的应用前景。
A simple approach combining electrochemical reaction self-assembly and photolithography has been proposed for the controlled and reproducible fabricating the highly ordered Au-Ag alloy arrays for SERS. The nucleation and growth processes of the Au-Ag alloy are adjusted easily via changing the applied voltage and reaction time to obtain the flower-like hierarchy nanostructure, which show the strongest SERS properties due to the wealthy Raman “hot spots” provided by the corners and edges in much-branched flower structure. Moreover, the maximum SERS is observed for the Au-Ag alloy with a small amount of Au (12%), which can lead to a charge separation and favor the probe molecules adsorption to the silver domains. By using these flower-like Au-Ag alloy arrays, the Rhodamine 6G (R6G) with the concentration of as low as 10−12M can be detected easily in this study, which would be very promising for the applications in biosensors and nanodevices with molecule-level detection.