Ag-NP@Ge-nanotaper/Si-micropillar ordered arrays as ultrasensitive and uniform surface enhanced Raman scattering substrates
Ag-NP@Ge-nanotaper/Si-micropillar ordered arrays as ultrasensitive and uniform surface enhanced Raman scattering substrates
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Ag-NP@Ge-nanotaper/Si-micropillar 有序阵列作为超灵敏且均匀的表面增强拉曼散射基底
DOI：
10.1039/c5nr06001j
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发表时间：
2015-01-01
期刊：
影响因子：
6.7
通讯作者：
Li, Xiangdong
中科院分区：
文献类型：
--
作者：
Liu, Jing;Meng, Guowen;Li, Xiangdong
表面增强拉曼散射(SERS)具有分子特异性、响应速度快、灵敏度高等优点，被认为是一种很好的分析检测手段。本文采用两步刻蚀、化学气相沉积在每个硅微柱上沉积絮状Ge纳米颗粒以及通过电偶极位移将Ag-NP修饰的Ge纳米颗粒修饰到Ge纳米颗粒上的组合工艺，制备了六方晶格微柱阵列的银纳米颗粒(Ag-NP)修饰纳米Ge基片。层次化的Ag-NP@Ge纳米纸/硅微柱阵列具有较强的SERS活性和较高的重复性，具有高密度的三维热点。使用我们的分级3D SERS底物，已分别检测到浓度低至10(-7)M和10(-5)M的甲基对硫磷(一种常用的杀虫剂)和多氯联苯-2(一种剧毒的多氯联苯)，在基于SERS的环境中有毒有机污染物的快速痕量检测方面显示出巨大的潜力。
Surface-enhanced Raman scattering (SERS) is considered to be an excellent candidate for analytical detection schemes, because of its molecular specificity, rapid response and high sensitivity. Here, SERSsubstrates of Ag-nanoparticle (Ag-NP) decorated Ge-nanotapers grafted on hexagonally ordered Simicropillar (denoted as Ag-NP@ Ge-nanotaper/ Si-micropillar) arrays are fabricated via a combinatorial process of two-step etching to achieve hexagonal Si-micropillar arrays, chemical vapor deposition of flocky Ge-nanotapers on each Si-micropillar and decoration of Ag-NPs onto the Ge-nanotapers through galvanic displacement. With high density three-dimensional (3D) "hot spots"created from the large quantities of the neighboring Ag-NPs and large-scale uniform morphology, the hierarchical Ag-NP@ Ge-nanotaper/ Si-micropillar arrays exhibit strong and reproducible SERS activity. Using our hierarchical 3D SERSsubstrates, both methyl parathion (a commonly used pesticide) and PCB-2 (one congener of highly toxic polychlorinated biphenyls) with concentrations down to 10(-7) M and 10(-5) M have been detected respectively, showing great potential in SERS-based rapid trace-level detection of toxic organic pollutants in the environment.