Patterned nuclear-shell nanoparticle surface enhanced Raman spectroscopy (SERS) active substrate and preparation method

A core-shell structure and nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problems of small preparation area and low production capacity, and achieve high sensitivity, low cost, and high steps. Effect

Inactive Publication Date: 2020-02-28
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

Although these patents have achieved better SERS effects than simple particles, they all use chemical synthe

Method used

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  • Patterned nuclear-shell nanoparticle surface enhanced Raman spectroscopy (SERS) active substrate and preparation method
  • Patterned nuclear-shell nanoparticle surface enhanced Raman spectroscopy (SERS) active substrate and preparation method
  • Patterned nuclear-shell nanoparticle surface enhanced Raman spectroscopy (SERS) active substrate and preparation method

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Experimental program
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Effect test

Embodiment 1

[0032] Regular triangle patterned Ni 50 @Au 50 A method for preparing a core-shell structure nanoparticle SERS active substrate, specifically comprising the following steps:

[0033] (1) Prepare a patterned substrate by laser interference: design the pattern as an equilateral triangle with a side length of 9 μm, build a laser interference system according to the expected pattern, and select a 1064nm Nd:YAG nanosecond laser (pulse width: 6ns, repetition frequency: 10Hz) to pass through the spectroscopic system Generate three beams of coherent light, adjust the energy density of the interference laser to 300mJ / cm 2 , the interfering light acts vertically on the surface of a single-sided polished 100-oriented single-crystal silicon wafer for 3 seconds, and ablates an equilateral triangle pattern with a side length of 9 μm. Wherever it works, it is the expected pattern.

[0034] figure 1 It is a three-beam laser interference ablation system, including 1064nm nanosecond laser 1...

Embodiment 2

[0041] Adjust the gold-nickel component distribution ratio of the deposited double-layer metal film in embodiment 2: by the method for magnetron sputtering, be that 20nm Au film is deposited on the silicon substrate surface that step (1) obtains, other experimental parameters are all with embodiment 1, the obtained pure Au nanoparticles SEM image is as follows figure 2 shown. Test of SERS active substrate Raman spectroscopy: the Au nanoparticle substrate was placed at a concentration of 10 -6 In the solution of the R6G probe molecule of M, test condition is consistent with embodiment 1, and the Raman spectrum curve that obtains is as follows Figure 5 Shown in (1) in. According to Raman enhancement factor calculation formula EF=(I SERS / I NR )(C NR / C SERS ), where I SERS and I NR respectively in the selected 613cm -1 SERS intensity at Raman peak and normal Raman spectrum intensity, C SERS and C NR are the concentrations for SERS substrate and Si substrate, respect...

Embodiment 3

[0043] Regulate the gold-nickel composition ratio of deposition double-layer metal film among the embodiment 3: by the method for magnetron sputtering, be two kinds of metal films of 4nm Ni 16nm Au with thickness, successively deposit on the silicon substrate surface that step (1) obtains, other Experimental parameter is all consistent with embodiment 1, the obtained Ni 20 @Au 80 SEM images of core-shell nanoparticles figure 2 shown. Raman spectrum test of SERS active substrate: the Ni 20 @Au 80 The core-shell nanoparticle substrate was placed at a concentration of 10 -6 In the solution of the R6G probe molecule of M, test condition is consistent with embodiment 1, and the Raman spectrum curve that obtains is as follows Figure 5 In (2) shown. According to Raman enhancement factor calculation formula EF=(I SERS / I NR )(C NR / C SERS ), where I SERS and I NR respectively in the selected 613cm -1 SERS intensity at Raman peak and normal Raman spectrum intensity, C S...

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Abstract

The invention relates to a patterned nuclear-shell nanoparticle surface enhanced Raman spectroscopy (SERS) active substrate and a preparation method. Nuclear-shell nanoparticles are composed of shelllayers of spherical (Au) particles and nuclear layers of magnetic (Ni) particles; and the patterned Ni@Au nuclear-shell nanoparticles are used as a SERS active substrate which can be used for efficient unimolecular SERS detection. The large-area patterned Ni@Au nuclear-shell nanoparticles are prepared by using a method by combining direct laser interference erosion with annealing double-layer metal films. A surface plasma resonance coupling effect between Au nanoshells and magnetic Ni nano nucleuses enables the particles to have more excellent SERS performance compared with pure Au nanoparticles. The simple method is provided for the large-area, high-flux and high-sensitivity SERS active substrate, and potential application prospects are achieved in fields such as bioimaging, security detection and catalysis.

Description

technical field [0001] The invention relates to a patterned core-shell structure nanoparticle SERS active substrate and a preparation method thereof, belonging to the technical field of laser Raman detection. Background technique [0002] Gold (Au) nanoparticle arrays (NPAs) are good substrates for surface-enhanced Raman spectroscopy (SERS: surface enhanced Raman spectroscopy), and are powerful tools for measuring trace molecules with high sensitivity. The resonant interaction of gold nanoparticles with incident electromagnetic radiation facilitates enhanced Raman spectral scattering. In recent years, with the development of plasmonic metamaterials and magnetic metamaterials, the composite structure of magnetic nanoparticles and gold nanoparticles has achieved the multifunctionality of a single material, which has attracted extensive attention from the scientific community. In particular, the core-shell nanomaterials with the magnetic core of the gold shell have a chemicall...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y15/00B82Y30/00
CPCG01N21/658B82Y15/00B82Y30/00
Inventor 王璐王作斌董莉彤李理张景然翁占坤
Owner CHANGCHUN UNIV OF SCI & TECH
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