Fabrication of iron oxide core/gold shell submicrometer spheres with nanoscale surface roughness for efficient surface-enhanced Raman scattering
Fabrication of iron oxide core/gold shell submicrometer spheres with nanoscale surface roughness for efficient surface-enhanced Raman scattering
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DOI：
10.1021/jp810561q
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发表时间：
2009-04
影响因子：
3.7
通讯作者：
Yueming Zhai;Junfeng Zhai;Yuling Wang;Shaojun Guo;Wen Ren;S. Dong
中科院分区：
文献类型：
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作者：
Yueming Zhai;Junfeng Zhai;Yuling Wang;Shaojun Guo;Wen Ren;S. Dong
报道了一种在纳米尺度上合成表面非常粗糙的Fe3O4核/金壳亚微米结构的方法。Fe3O4粒子首先用均匀的聚合物进行层层修饰，然后吸附大量的金纳米种子以进一步形成金壳。壳层由大量随机排列的不规则纳米Au颗粒组成，这些Au纳米颗粒之间有明确的边界。Fe3O4核/Au壳层粒子在近红外区域表现出较强的等离子体共振吸收，并可通过外加磁体快速从溶液中分离出来。将这种非常粗糙的Fe3O4核/金壳多组分用于4-氨基硫酚的吸附，并以此为衬底进行了表面增强拉曼光谱检测。
A method to synthesize Fe3O4 core/Au shell submicrometer structures with very rough surfaces on the nanoscale is reported. The Fe3O4 particles were first modified with uniform polymers through the layer-by-layer technique and then adsorbed a lot of gold nanoseeds for further Au shell formation. The shell was composed of a large number of irregular nanoscale Au particles arranged randomly, and there were well-defined boundaries between these Au nanoparticles. The Fe3O4 core/Au shell particles showed strong plasmon resonance absorption in the near-infrared range, and can be separated quickly from solution by an external magnet. This kind of very rough Fe3O4 core/Au shell multicomponent was used in the adsorption of 4-aminothiophenol and as a substrate for detection by surface-enhanced Raman spectroscopy.