Jianxia Qi , Wanting Zhou , Chengyuan Yang , Wen Liu , Chang Guan , Chengyun Zhang , Qingyan Han , Wei Gao , Lipeng Zhu , Jun Dong
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引用次数: 0
摘要
本文介绍了通过静电自组装设计自下而上的 "三明治 "结构基底。银微孔板（AgMP）是稳定的结构基底，单层石墨烯被湿法转移到银微孔板上。然后通过液-液三相自组装将 Au@Ag 纳米立方体（Au@Ag NCs）组装到上层，形成 Au@AgNCs/G/AgMP "三明治 "基底。贵金属纳米粒子的电磁增强和石墨烯的化学增强相结合，协同放大了被检测分子的信号，从而显著增强了表面增强拉曼散射（SERS）。实验结果表明，这种基底可以检测浓度低至 10-12 M 的罗丹明 6 G (R6G)和 10-9 M 的水晶紫 (CV)。此外，这种基底还可以检测浓度低至 0.0625 g/L 的阿斯巴甜 (APM)，远远低于人类的典型日摄入量。这些研究结果表明，这种基底具有优异的 SERS 性能，具有广泛的应用潜力。
Fabrication of sandwich nanostructured substrates with Au@Ag NCs/Graphene/AgMP for ultrasensitive SERS detection
This paper presents the design of a bottom-up "sandwich" configuration substrate via electrostatic self-assembly. A silver microplate (AgMP) serves as the stable structural base, onto which monolayer graphene is wet-transferred. Au@Ag nanocubes (Au@Ag NCs) are then assembled on the upper layer through liquid-liquid three-phase self-assembly, forming a Au@AgNCs/G/AgMP “sandwich” substrate. The combination of electromagnetic enhancement from noble metal nanoparticles and chemical enhancement from graphene synergistically amplifies the signal of detected molecules, leading to significant Surface-Enhanced Raman Scattering (SERS) enhancement. Experimental results demonstrate that this substrate can detect Rhodamine 6 G (R6G) at concentrations as low as 10–12 M and Crystal Violet (CV) at 10–9 M. Moreover, the substrate can detect Aspartame (APM) at concentrations as low as 0.0625 g/L, well below the typical daily intake levels for humans. These findings indicate that the substrate exhibits excellent SERS performance and holds significant potential for broad applications.
期刊介绍：
Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.
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