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Yuan Y T, Mi J J, Wang M, et al. The preparation and surface enhanced Raman Scattering spectroscopy of AuNRs@ZIF-8[J]. Opto-Electron Eng, 2023, 50(6): 230029. doi: 10.12086/oee.2023.230029
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The preparation and surface enhanced Raman Scattering spectroscopy of AuNRs@ZIF-8
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Abstract
Surface enhanced Raman spectroscopy (SERS) is a kind of molecular spectrum, which has the characteristics of rapidity, high sensitivity and fingerprint recognition, and has important applications in analytical chemistry, biomedicine and other fields. However, some detection molecules in the solution sample are difficult to be adsorbed by the SERS substrate, resulting in difficulty in enhancing the Raman signal of molecular. To this end, this paper proposes a core-shell structure (AuNRs@ZIF-8) of ZIF-8 material coated gold nanorods (AuNRs) to achieve Raman signal enhancement. Both the surface plasmon enhancement characteristics of the gold nanoparticles and the adsorption properties of ZIF-8, a porous MOFs material, can be used to realize highly sensitive Raman detection of the solution samples. We first prepare the well-homogeneous AuNRs by seed crystallization method, then modify them with polyvinylpyrrolidone (PVP), and finally add the metal-organic framework ZIF-8 precursor to obtain the AuNRs@ZIF-8 Core-shell nanostructures. The structure has high sensitivity to the SERS detection of rhodamine (R6G), the detection limit can be as low as 10−9 M, and the linear relationship and homogeneity are good. In addition, we further confirm the formation of the core-shell nanostructures and effective adsorption of the target molecules by testing the UV-Vis absorption spectra of the structure before and after R6G absorption.-
Keywords:
- SERS /
- AuNRs@ZIF-8 /
- Core-shell nanostructure /
- light absorption /
- adsorption
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References
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Overview
As a non-destructive, rapid and highly sensitive molecular detection technology, surface enhanced Raman spectroscopy (SERS) has been widely used in analytical chemistry, biomedicine, food detection and other fields. Currently, it is generally believed that there are two kinds of SERS enhanced mechanism. One is the chemical mechanism of charge transfer between molecules. The second is the physical mechanism, namely local surface plasmon resonance (LSPR). When the incident laser is resonantly coupled with the metal substrate (Au, Ag, Cu, etc.) at a certain excitation wavelength, a strong local electromagnetic field is formed, which is confined to a small range on the metal surface. This phenomenon, known as local surface plasmon resonance (LSPR), can greatly enhance the Raman signals of the detected molecules. Generally, only when the detected molecules are close to the surface of the precious metal structure through chemical or physical action could there be a good SERS signal. Therefore, it has become particularly important to design SERS bases with strong adsorption capacity for detected molecules.
Metal-organic framework (MOFs) is a new type of porous framework material which is self-assembled by metal ions or clusters as nodes and organic molecules as ligands through coordination bonds. Due to its unique network structure, large porosity, flexible structure, and multiple molecular adsorption sites, MOFs are very conducive to sample enrichment, and are widely used in adsorption, separation, and storage of solution samples. Combining metal organic framework with metal substrate material, using MOFs enrichment and SERS effect of precious metals, the detection molecules could be close to the surface of precious metals, thus effectively collecting Raman signals of the test molecules.
This paper proposes a core-shell structure (AuNRs@ZIF-8) of ZIF-8 material coated gold nanorods (AuNRs) to achieve Raman signal enhancement. Both the surface plasmon enhancement characteristics of the gold nanoparticles and the adsorption properties of ZIF-8, a porous MOFs material, can be used to realize highly sensitive Raman detection of the solution samples. We first prepare well-homogeneous AuNRs by seed crystallization method, then modify them with polyvinylpyrrolidone (PVP), and finally add the metal-organic framework ZIF-8 precursor to obtain the AuNRs@ZIF-8 Core-shell nanostructures. The structure has high sensitivity to the SERS detection of rhodamine (R6G), the detection limit can be as low as 10−9 M, and the linear relationship and homogeneity are good. In addition, we further confirm the formation of the core-shell nanostructures and effective adsorption of the target molecules by testing the UV-Vis absorption spectra of the structure before and after R6G absorption.
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Yuan Y T, Mi J J, Wang M, et al. The preparation and surface enhanced Raman Scattering spectroscopy of AuNRs@ZIF-8[J]. Opto-Electron Eng, 2023, 50(6): 230029. doi: 10.12086/oee.2023.230029
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Figure 1.
Schematic diagram of the work study process
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Figure 2.
SEM images of (a) AuNRs, (b) ZIF -8, (c, d) AuNRs@ZIF-8 of different magnifications
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Figure 3.
UV–Vis absorption spectra of the as-synthesized AuNRs and AuNRs@ZIF-8
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Figure 4.
Sample performance diagram. (a) SERS spectra of 10−5 mol/L R6G for AuNRs@ZIF-8 and AuNRs substrates; (b) SERS spectra of R6G with the concentration ranging from 10−9 to 10−4 mol/L for AuNRs@ZIF-8 substrates; (c) The Raman intensities at 612 cm−1 versus logarithmic values of R6G concentrations; (d) Series of SERS spectra of random 10 sites of the substrates absorbing 10−4 mol/L R6G
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Figure 5.
Raman spectrum of the R6G powder on silicon wafer
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Figure 6.
UV–vis absorption spectra of the R6G and R6G/AuNRs@ZIF-8
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