Tailoring Optical Properties of Silicon Nanowires by Au Nanostructure Decorations: Enhanced Raman Scattering and Photodetection
Tailoring Optical Properties of Silicon Nanowires by Au Nanostructure Decorations: Enhanced Raman Scattering and Photodetection
复制标题
通过金纳米结构修饰定制硅纳米线的光学特性：增强拉曼散射和光电检测
DOI：
10.1021/jp210198u
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发表时间：
2012-02-23
影响因子：
3.7
通讯作者：
Xiong, Qihua
中科院分区：
文献类型：
--
作者：
Chen, Renjie;Li, Dehui;Xiong, Qihua
金属纳米颗粒修饰的半导体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。在这里，我们展示了一种基于电流位移的策略，使Au纳米颗粒原位成核，然后沿相同的Si纳米线（SiNW）后生长成更高阶的Au纳米结构，如二聚体、纳米棒和纳米棱镜。Au纳米结构的存在显著增强了纳米线的光学性质。特别地，利用Au二聚体装饰实现了Si拉曼散射信号的24倍增强。沿着纳米线平行排列的Au纳米棒强烈增强了Si拉曼散射的各向异性，在平行极化下的信号比垂直极化下的信号强28倍以上，首次证明了表面等离子体增强天线效应。此外，我们证明了表面等离子体激元提高光电流的硅纳米线几乎100%，这是高于以前的报告。我们的研究表明，硅纳米线装饰与金属纳米结构的原位电流位移表现出显着的承诺，对高效率的光电探测和光捕获应用。
Metallic nanoparticles (NPs) decorated semiconductor nanowires (NWs) heterostructures show significant promise in enhanced optical and opto-electrical properties due to the coupling of surface plasmon to nanowires. Here, we demonstrate a galvanic displacement based strategy to achievein situnucleation of Au nanoparticles and then postgrowth into higher order Au nanostructures such as dimers, nanorods, and nanoprisms alongthe sameSi nanowires (SiNWs). The presence of Au nanostructures significantly enhances the optical properties of nanowires. Particularly, a 24 times enhancement of Si Raman scattering signal was achieved with a Au dimer decoration. A Au nanorod aligned in parallel along nanowire strongly enhances the anisotropy of Si Raman scattering, with more than 28 times stronger signal under parallel polarization than that under perpendicular polarization, demonstrating for the first time the surface plasmon enhanced antenna effect. In addition, we demonstrate that surface plasmon enhances photocurrent of SiNW by almost 100%, which is higher than previous reports. Our studies show that SiNWs decorated with metallic nanostructures byin situgalvanic displacement exhibit significant promise toward high efficiency photodetection and light harvesting applications.