Multi-branched gold and silver composite nanomaterial having excellent surface enhanced Raman scattering characteristics and preparation method thereof

A surface-enhanced Raman, composite nanomaterial technology, applied in Raman scattering, nanotechnology for materials and surface science, analyzing materials, etc., can solve problems such as unfavorable environmental protection, and achieve low-cost, excellent surface-enhanced Raman Scattering effect, effect of excellent performance

Inactive Publication Date: 2017-06-16
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 re

Method used

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  • Multi-branched gold and silver composite nanomaterial having excellent surface enhanced Raman scattering characteristics and preparation method thereof
  • Multi-branched gold and silver composite nanomaterial having excellent surface enhanced Raman scattering characteristics and preparation method thereof
  • Multi-branched gold and silver composite nanomaterial having excellent surface enhanced Raman scattering characteristics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A multi-branched gold-silver composite nano material with excellent surface-enhanced Raman scattering characteristics, wherein the mass content of gold in the composite nano material is 66%, and the mass content of silver is 34%; the composite nano material is nano particles The surface of the nanoparticle 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 nanoparticle is 50 nm.

[0054] The method for preparing the above-mentioned multi-branched gold-silver composite nanomaterial with excellent surface-enhanced Raman scattering characteristics includes the following steps:

[0055] (1) Dissolve 0.34g silver nitrate and 40μL T80 in 10mL deionized water at room temperature, and disperse ultrasonically for 5min to obtain a mixed solution; add 27.2g gold target, use wavelength 532nm, pulse width 10ns, frequency 10Hz, laser power Dens...

Embodiment 2-10

[0065] A method for preparing multi-branched gold-silver composite nanomaterials with excellent surface-enhanced Raman scattering properties is as described in Example 1, except that in step (2), 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-branched gold-silver composite nanomaterial with excellent surface-enhanced Raman scattering characteristics 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 multi-branched gold and silver composite nanomaterial having excellent surface enhanced Raman scattering characteristics and a preparation method thereof. The multi-branched gold and silver composite nanomaterial comprises the steps of dissolving silver nitrate and polysorbates 80 in deionized water, and performing ultrasonic dispersion; adding gold, and obtaining Ag@Au bimetallic nanoparticles through laser irradiation, centrifugation and drying; causing the obtained Ag@Au bimetallic nanoparticles to undergo ultrasonic dispersion into the deionized water, adding chloroauric acid aqueous solution and ascorbic acid aqueous solution, reacting for 2-3 min at indoor temperature, and obtaining initial multi-branched Ag@Au composite nanomaterial dispersion liquid; mixing the obtained dispersion liquid and ethanol solution of silver nitrate, and obtaining the multi-branched gold and silver composite nanomaterial through laser radiation, centrifugation, washing and drying. The preparation method is simple, controllable, green, environmentally friendly and low in cost, and the obtained composite nanomaterial is small in size (-50 nm) and has excellent performances in the aspect of surface enhanced Raman scattering.

Description

Technical field [0001] The invention relates to a multi-branched gold and silver (Ag@Au) composite nano material with excellent surface enhanced Raman scattering characteristics and a preparation method thereof, and belongs to the preparation and application field of a novel nano material. Background technique [0002] The rough surface of Ag and Au precious metal nanomaterials has a unique local surface plasmon resonance mode in the near-infrared light region. After light excitation, it can form a strong electromagnetic field near the surface of the precious metal, so it has significant surface enhanced Raman scattering for the loaded material The (SERS) effect is used to realize the microanalysis of biomolecules and the fine detection of active cells, which has a profound impact in special fields such as tumor cell diagnosis and photothermal therapy. Constructing a new type of nanostructure to effectively improve the surface roughness is a decisive factor for significantly impr...

Claims

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Application Information

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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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