Acid-directed synthesis of SERS-active hierarchical assemblies of silver nanostructures
Acid-directed synthesis of SERS-active hierarchical assemblies of silver nanostructures
复制标题
银纳米结构 SERS 活性分级组装体的酸引导合成
DOI：
10.1039/c0jm02837a
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Wang, Hsing-Lin
中科院分区：
文献类型：
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作者：
Zhang, Bin;Xu, Ping;Wang, Hsing-Lin
在酸性小分子的辅助下，在溶液中合成了具有SERS活性的银分级组装体。在这里，我们展示了金属纳米颗粒（MNP）的酸导向自组装成具有复杂结构的大系统，而不应用任何聚合物表面活性剂或封端剂。经验证，小酸分子（柠檬酸、扁桃酸等）结合到常规溶液化学中可以将MNP组装成明确定义的分级结构。所构建的组装结构具有高度粗糙的表面可以是高度灵敏的Sers平台，并且所制造的核-壳Ag丝对分析物三聚氰胺表现出特别高的Sers灵敏度。所制备的具有分级结构的Ag颗粒没有表现出明显的偏振依赖性Sers行为，并且这种各向同性特征可能是高灵敏度Sers标签的优势，因为分子检测不需要一定的入射偏振。我们相信，随后添加酸以诱导自组装结构的形成可以是制造具有复杂形貌的金属结构的通用合成平台。
SERS-active silver hierarchical assemblies are synthesized in solution by the assistance of small acid molecules. We here demonstrate the acid-directed self-assembly of metal nanoparticles (MNPs) into large systems with complex structures, without the application of any polymer surfactant or capping agent. It is verified that small acid molecules (citric acid, mandelic acid, etc.) incorporated into conventional solution chemistry can direct the assembly of MNPs into well-defined hierarchical structures. The constructed assembled structures with highly roughened surfaces can be highly sensitive SERS platforms, and the fabricated core–shell Ag wires show especially high SERS sensitivity toward the analyte melamine. The prepared Ag particles with hierarchical structures show no evident polarization-dependent SERS behavior, and this isotropic feature may be an advantage for highly sensitive SERS tags, since no certain incident polarization is required for molecule detection. We believe the subsequent addition of acid to induce formation of self-assembled structures can be a general synthetic platform to fabricate metal structures with complex morphologies.