Preparation and characterization of Ag@C composites with hexagon silver core and controllable carbon shell for surface-enhanced Raman scattering
Preparation and characterization of Ag@C composites with hexagon silver core and controllable carbon shell for surface-enhanced Raman scattering
复制标题
表面增强拉曼散射六角银核可控碳壳Ag@C复合材料的制备及表征
DOI：
10.1007/s10853-017-1801-3
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发表时间：
2018-03-01
影响因子：
4.5
通讯作者：
Lu, Lu-de
中科院分区：
文献类型：
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作者：
Liu, Jiao;Jiang, Peng-peng;Lu, Lu-de
以葡萄糖为碳源和稳定剂，银银为银源，三辛胺（TOA）为软模板和萃取剂，制备了新型稳定的核壳结构银碳纳米复合材料（Ag@CSs）。值得一提的是，银核的形状显示六边形，我们认为TOA和葡萄糖选择性地吸附Ag（111）晶面导致银核的这种生长模式。由于其尖角和边缘的局部场效应增强，这种结构表现出上级的表面增强拉曼散射（Sers）增强性能。水热碳壳层不仅有效地避免了Ag纳米粒子核的团聚，而且在整个实验过程中起到了Sers活性纳米结构的保护层作用。此外，产品在乙醇溶液中储存一段时间后，松散壳的厚度显著减小。结果表明，滴在Ag@CSs上的探针分子具有较低的Sers活性，而在探针分子溶液中浸泡一段时间的探针分子具有较高的Sers活性，表明使用这种Ag@CSs基底检测探针分子可能需要一个相互作用的过程。结果表明，Ag@CSs具有良好的表面增强拉曼光谱性能和长期稳定性，具有很大的应用潜力。
Here, novel and stable core-shell silver-carbon nanocomposites (Ag@CSs) were obtained using glucose as the carbon source and stabilizer, silver nitrate as the silver source, and trioctylamine (TOA) as the soft template and extractant. It is worth mentioning that the shape of the silver core shows the hexagon shape, and we consider that TOA and glucose selectively adsorb the Ag (111) crystal face resulting in this growth pattern of the silver core. Owing to the enhanced local field effect around their sharp corners and edges, such structure exhibits superior properties for the surface-enhanced Raman scattering (SERS) enhancement. The hydrothermal carbon shell not only effectively avoids the agglomeration of Ag nanoparticles core, but also serves as a protective layer of the SERS active nanostructure during the whole course of the experiment. In addition, the thickness of the loose shell was significantly reduced after the product was stored in ethanol solution for a period of time. It is found that dropped cast probe molecules onto Ag@CSs have a lower SERS activity, while that immersed in the probe molecular solution for a period of time have a higher SERS activity, indicating that the detection of the probe molecules using this Ag@CSs substrate may require an interactive process. The results show that the as-obtained Ag@CSs hold tremendous potential for SERS applications for its long-term stability and superior SERS performance.