拉曼散射
吸附
检出限
纳米颗粒
分子
基质(水族馆)
拉曼光谱
壳体(结构)
纳米技术
材料科学
化学工程
化学
色谱法
有机化学
光学
复合材料
物理
工程类
海洋学
地质学
作者
Yuanting Li,Mengmeng Zhang,Zhouya Wu,Xiaoli Bao
标识
DOI:10.1002/anse.202200108
摘要
Abstract Surface enhanced Raman scattering (SERS) is difficult to detect molecules with weak adsorption, like aldehydes. Herein, we fabricated core‐shell Au@Ag‐MOFs nanoparticles as SERS substrate. The shell can be controllably synthesized, with the thickness about 3 nm. After the morphology and SERS activity characterization, Au@Ag‐MOFs were employed to sensitive and label‐free detect p ‐chlorobenzaldehyde (PCB) in water samples. The pore structure and large surface area of Ag‐MOFs shell results more adsorption of PCB, dragging more molecules to “hot spots” area. The abundant amino group in Ag‐MOFs allows the occurrence of Schiff base reaction with aldehyde group in PCB. Taking the synergistic effect of both physical and chemical enhancement, SERS signals of PCB were greatly boosted. The method showed good linearity between 5.0×10 −12 M to 1.0×10 −8 M for PCB with the limit of detection (LOD) down to 3.3×10 −12 M. The proposed method has great potential to be a reliable analytical strategy for aldehydes in real samples.
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