等离子体子
材料科学
拉曼散射
纳米技术
表面等离子共振
纳米晶
纳米颗粒
拉曼光谱
沸石咪唑盐骨架
金属有机骨架
光电子学
吸附
化学
光学
有机化学
物理
作者
Fangmeng Liu,Ka Kit Chui,Yuqiang Fang,Shizheng Wen,Xiaolu Zhuo,Jianfang Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-04-17
标识
DOI:10.1021/acsnano.4c00208
摘要
Utilizing electromagnetic hotspots within plasmonic nanogaps is a promising approach to create ultrasensitive surface-enhanced Raman scattering (SERS) substrates. However, it is difficult for many molecules to get positioned in such nanogaps. Metal-organic frameworks (MOFs) are commonly used to absorb and concentrate diverse molecules. Herein, we combine these two strategies by introducing MOFs into plasmon-coupled nanogaps, which has so far remained experimentally challenging. Ultrasensitive SERS substrates are fabricated through the construction of nanoparticle-on-mirror structures, where Au nanocrystals are encapsulated with a zeolitic imidazolate framework-8 (ZIF-8) shell and then coupled to a gold film. The ZIF-8 shell, as a spacer that separates the Au nanocrystal and the Au film, can be adjusted in thickness over a wide range, which allows the electric field enhancement and plasmon resonance wavelength to be varied. By trapping Raman-active molecules within the ZIF-8 shell, we show that our plasmon-coupled structures exhibit a superior SERS detection performance. A range of volatile organic compounds at the concentrations of 10-2 mg m-3 can be detected sensitively and reliably. Our study therefore offers an attractive route for synergistically combining plasmonic electric field enhancement and MOF-enabled molecular enrichment to design and create SERS substrates for ultrasensitive detection.
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