Surface-enhanced Raman scattering from gold-coated germanium oxide nanowires
Surface-enhanced Raman scattering from gold-coated germanium oxide nanowires
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DOI：
10.1002/jrs.1931
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发表时间：
2008-07-01
影响因子：
2.5
通讯作者：
Shanker, B.
中科院分区：
文献类型：
--
作者：
Khan, Muhammad A.;Hogan, Timothy P.;Shanker, B.
我们利用本体合成的二氧化锗纳米线（NW）作为纳米级结构，可以涂上贵金属，以允许在较宽的频率范围内激发表面等离子体激元。在简单的石英管炉装置中，使用金催化剂辅助的气-液-固（VLS）生长机制在硅衬底上合成纳米线。所得纳米线的直径为-100-200 nm，平均长度为-10-40 gm，随机分布在基底上。随后在纳米线上涂上金薄膜，提供表面等离激元活性表面。采用 785 nm 近红外 (NIR) 激发的表面增强拉曼散射 (SERS) 研究显示，检测 4-甲基苯硫醇 (4-MBT)、反式 1,2-双(4-吡啶基)乙烯 (BPE) 和 1,2-苯二硫醇 (1,2-BDT) 探针分子的亚单层浓度具有显着增强（平均增强 >10'）和良好的均匀性。我们还在金属涂层后的纳米线拉曼光谱中观察到强烈、宽广的连续谱，该连续谱往往随着分析物单层的形成而减弱。版权所有 (c) 2008 John Wiley & Sons, Ltd.
We utilized bulk-synthesized nanowires (NWs) of germanium dioxide as nanoscale structures that can be coated with noble metals to allow the excitation of surface plasmons over a broad frequency range. The NWs were synthesized on substrates of silicon using gold-catalyst-assisted vapor-liquid -solid (VLS) growth mechanism in a simple quartz tube furnace setup. The resulting NWs have diameters of -100-200 nm, with lengths averaging -10-40 gm and randomly distributed on the substrate. The NWs are subsequently coated with thin films of gold, which provide a surface-plasmon-active surface. Surfaceenhanced Raman scattering (SERS) studies with near-infrared (NIR) excitation at 785 nm show significant enhancement (average enhancement >10') with good uniformity to detect submonolayer concentrations of 4-methylbenzenethiol (4-MBT), trans-1,2-bis(4-pyridyl)ethylene (BPE), and 1,2-benzendithiol (1,2-BDT) probe molecules. We also observed an intense, broad continuum in the Raman spectrum of NWs after metal coating, which tended to diminish with the analyte monolayer formation. Copyright (c) 2008 John Wiley & Sons, Ltd.