Ultrasensitive and recyclable SERS substrate based on Au-decorated Si nanowire arrays
Ultrasensitive and recyclable SERS substrate based on Au-decorated Si nanowire arrays
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基于金修饰硅纳米线阵列的超灵敏且可回收的SERS基底
DOI：
10.1039/c3dt51686e
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发表时间：
2013
影响因子：
4
通讯作者：
Li Chunzhong
中科院分区：
文献类型：
--
作者：
Yang Xiaoling;Zhong Hua;Zhu Yihua;Shen Jianhua;Li Chunzhong
金属纳米颗粒修饰的硅纳米线异质结构由于表面等离子体激元与纳米线的耦合而在增强光学和光电性能方面显示出显著的前景。本文采用简单的电化学置换反应成功制备了可循环利用的Au修饰硅纳米线阵列（Au-SiNWAs）作为表面增强拉曼散射（Sers）基底。探讨了Au纳米粒子的不同平均粒径和聚集程度对Sers活性的影响。基底的Sers活性强烈地依赖于Au纳米粒子在SiNW表面的平均尺寸和聚集水平，并且通过控制反应时间可以实现最佳的SiNW表面Au纳米粒子的尺寸和分离。优化后的Au-SiNWA基底具有109的增强因子的灵敏度，并且能够检测浓度低至10−11 M的分析物分子。更重要的是，Sers基底是可回收的，因为由于分析物分子的UV光催化降解而具有自清洁功能。通过对模型分子罗丹明B（RhB）的检测，证实了Au-SiNWA Sers基底的高灵敏度和可循环性。我们的研究表明，独特的Au-SiNWA Sers基底具有很大的潜力，使Sers得到更广泛的应用。
Metallic nanoparticle (NP) decorated silicon nanowire (SiNW) heterostructures show significant promise in enhanced optical and opto-electrical properties due to the coupling of surface plasmon to nanowires. Here, recyclable Au-decorated silicon nanowire arrays (Au-SiNWAs) as surface-enhanced Raman scattering (SERS) substrates were successfully fabricated by a simple galvanic displacement reaction. The influence of different average size and aggregation level of Au NPs on SERS activity was explored. The SERS activity of the substrates strongly depends on the average size and aggregation level of Au NPs on the surface of the SiNWs, and the most optimal size and separation of AuNPs on the SiNWs can be achieved by controlling the reaction time. The optimized Au-SiNWA substrate exhibits ultrahigh sensitivity with an enhancement factor of 109, and is able to detect the analyte molecule at a concentration as low as 10−11 M. More importantly, the SERS substrate is recyclable, as enabled by a self-cleaning function due to UV light photocatalytic degradation of the analyte molecules. The high sensitivity and recyclability of the Au-SiNWA SERS substrate is demonstrated by the detection of a model molecule rhodamine B (RhB). Our studies show that the unique Au-SiNWA SERS substrates have significant potential to put SERS into wider application.