A preparation method of a multi-dendritic gold-silver composite nanomaterial with surface-enhanced Raman scattering properties

A surface-enhanced Raman and gold-silver composite technology, which is applied in Raman scattering, nanotechnology for materials and surface science, analytical materials, etc., can solve problems such as unfavorable environmental protection, achieve low cost, excellent SERS characteristics, excellent Effect of Surface Enhanced Raman Scattering Effect

Inactive Publication Date: 2019-01-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, what the invention prepares is a polydendron colloid of pure gold nanoparticles, which requires the use of hydroquinone organic reagents, which is not conducive to environmental protection

Method used

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  • A preparation method of a multi-dendritic gold-silver composite nanomaterial with surface-enhanced Raman scattering properties
  • A preparation method of a multi-dendritic gold-silver composite nanomaterial with surface-enhanced Raman scattering properties
  • A preparation method of a multi-dendritic gold-silver composite nanomaterial with surface-enhanced Raman scattering properties

Examples

Experimental program
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Effect test

Embodiment 1

[0053] A multi-branched gold-silver composite nanomaterial with excellent surface-enhanced Raman scattering characteristics, the mass content of gold in the composite nanomaterial is 66%, and the mass content of silver is 34%; the composite nanomaterial is nanoparticles Stacked, the surface of the nanoparticles is a dendritic structure, and each nanoparticle is composed of a central solid structure and an elongated branch structure on the surface of the central solid structure, and the average size of the nanoparticles is 50nm.

[0054] The preparation method of the above-mentioned multi-dendrite gold-silver composite nanomaterial with excellent surface-enhanced Raman scattering characteristics comprises the following steps:

[0055] (1) Dissolve 0.34g of silver nitrate and 40μL T80 in 10mL of deionized water at room temperature, and disperse ultrasonically for 5 minutes to obtain a mixed solution; Density 12GW / cm 2 The Nd-YAG laser ablated the gold target in the mixed soluti...

Embodiment 2-10

[0065] A kind of preparation method of the branched gold-silver composite nanomaterial with excellent surface-enhanced Raman scattering characteristics, as described in Example 1, the difference is that in step (2), add 80, 95, 110, 125, 140, 155, 170, 185, 200μL of 0.05mol / L chloroauric acid aqueous solution.

Embodiment 11

[0067] A method for preparing a multi-dendritic gold-silver composite nanomaterial with excellent surface-enhanced Raman scattering properties is as described in Example 1, except that the laser irradiation time in step (3) is 1.5h.

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Abstract

The invention provides a method for preparing a multi-branched gold-silver composite nanomaterial with surface-enhanced Raman scattering characteristics. The preparation steps of the present invention are as follows: dissolving silver nitrate and polysorbate 80 in deionized water, and ultrasonically dispersing; adding gold targets, laser irradiation, centrifugation, and drying to obtain Ag@Au bimetallic nanoparticles; Ultrasonic dispersion of @Au bimetallic nanoparticles in deionized water, adding chloroauric acid aqueous solution and ascorbic acid aqueous solution, and reacting at room temperature for 2-3min to obtain the initial multi-branched Ag@Au composite nanomaterial dispersion; the obtained dispersion was mixed with The ethanol solution of silver nitrate is mixed, and after laser irradiation, centrifugation, washing and drying, a multi-branched gold-silver composite nanometer material is obtained. The preparation method of the invention is simple, controllable, environment-friendly and low in cost, and the obtained composite nano material has a small size (~50nm), and has excellent performance in surface enhanced Raman scattering.

Description

technical field [0001] The invention relates to a method for preparing a multi-branched gold-silver (Ag@Au) composite nanomaterial with surface-enhanced Raman scattering characteristics, and belongs to the field of preparation and application of novel nanomaterials. Background technique [0002] Due to the unique localized surface plasmon resonance mode in the near-infrared region of Ag and Au noble metal nanomaterials with rough surfaces, they can form a strong electromagnetic field near the noble metal surface after photoexcitation, so they have significant surface-enhanced Raman scattering for loaded substances. The (SERS) effect is used to realize the micro-analysis of biomolecules and the fine detection of active cells, and has a profound impact in special fields such as tumor cell diagnosis and photothermal therapy. Constructing new nanostructures and effectively improving the surface roughness is the decisive factor for significantly improving the SERS performance of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24B82Y40/00B82Y30/00G01N21/65
CPCG01N21/658B82Y30/00B82Y40/00B22F9/24B22F2999/00B22F1/0553B22F1/07B22F1/054B22F2202/11
Inventor 陈明徐林林王大猛张华
Owner SHANDONG UNIV
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