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
Yi Liu,Ka Kit Chui,Yini Fang,Shizheng Wen,Xiaolu Zhuo,Jianfang Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-04-17
卷期号:18 (17): 11234-11244
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI