Tri-metal nano particle with asymmetric structure, preparation method and application thereof

A nanoparticle, asymmetric technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve superior physical and chemical properties, promote the effect of molecular absorption and activation

Active Publication Date: 2015-07-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, asymmetric structure trimetallic nanomaterials with both surface-enhanced Raman effect and catalytic activity have not been reported.

Method used

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  • Tri-metal nano particle with asymmetric structure, preparation method and application thereof
  • Tri-metal nano particle with asymmetric structure, preparation method and application thereof
  • Tri-metal nano particle with asymmetric structure, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Centrifuge 1ml of pure gold rod nanoparticles with an absorbance of 1.4-2.0 (the characteristic ultraviolet absorption peak position of gold rods is at 800-850nm) at a speed of 5500-6500rpm for 12-20min, concentrate and disperse them in 1ml, 80mM hexadecane Add 200-500 μL of 0.01M silver nitrate solution and 150-125 μL of 0.1M ascorbic acid solution to the triethylammonium bromide (CTAC) solution, shake well, place at 65°C for 6-8 hours, centrifuge Concentration, gold core-silver shell nanoparticles (referred to as AuNRsAg) with different thicknesses can be obtained.

[0023] The prepared nanoparticles were subjected to morphology analysis, see attached figure 1 , Figure a is a TEM image of the high-purity gold rod nanoparticles used in the technical solution of this example; Figure b is a TEM image of gold core-silver shell (AuNRsAg) nanoparticles; figure c is a gold rod nanoparticle and gold core-silver The ultraviolet spectrum of shell (AuNRsAg) nanoparticles can be...

Embodiment 2

[0028] Concentration of 1×10 in 2mL -4 Add 1mL concentration of 0.1mol / L sodium borohydride solution in the p-nitrothiophenol solution of mol / L, place the dandelion-shaped asymmetric trimetallic nanoparticles obtained in Example 1 in the mixed solution, fully stir and Test the Raman scattering signal every 30s, see the attached Figure 4 .

[0029] Figure 4 It is the Raman spectrogram of the reduction of p-nitrothiophenol by sodium borohydride as a function of time under the catalysis of the dandelion-shaped asymmetric trimetallic nanoparticles prepared in Example 1. It can be seen from the spectrum that within 5 minutes, p-nitrothiophenol 1575cm -1The nitro Raman scattering peak at 1594cm decreases gradually. -1 The Raman scattering peak of the amino group increases gradually, and the intermediate product is at 1144 cm -1 , 1392cm -1 and 436cm -1 The azo Raman scattering peak appears. Finally, p-nitrothiophenol was reduced to p-aminothiophenol, and 4,4'-dimercaptoaz...

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Abstract

The invention discloses a tri-metal nano particle with an asymmetric structure, a preparation method and application thereof. The preparation method comprises the steps: utilizing a golden rod as a seed and a silver nitrate solution as a metal precursor, utilizing a seed growing method to prepare rod-like template nano particles with core-shell structures and with silver coated outside the golden rod, centrifugally dispersing the particles in ultrapure water; utilizing a modified electric displacement reaction and a common reduction reaction, adding chloropalladic acid to the obtained aqueous solution containing template nano particles, utilizing ascorbic acid as a reducing agent and standing at room temperature; adjusting the molar ratio of silver nitrate and chloropalladic acid and the amount of surfactant and ascorbic acid, and obtaining dandelion-shaped nano particles under the action of Oswald ripening effect, wherein the brace is of a golden rod structure; one end of the golden rod is coated with spherical silver-palladium alloy with a branch-like structure and the other end is a pure golden rod. In the organic reaction using palladium as a catalyst, the palladium can be used as the catalyst with good activity and can be used as the tracking and detection for Raman spectrum signals.

Description

technical field [0001] The invention relates to a metal nanoparticle and a preparation method thereof, in particular to a preparation method and an application of a trimetallic nanoparticle with an asymmetric structure, and belongs to the field of nanomaterials. Background technique [0002] Due to their unique optical, electric, and magnetic properties, precious metal nanoparticles have received extensive attention and applications in recent years, and the shape control of nanostructures has always been one of the hot topics in the field of nanomaterials. The morphology of metal nanostructures has a very important impact on their properties and applications. Among the currently published research results, the shapes of polymetallic nanoparticles are mainly spherical, rod-shaped, cubic and dendritic, etc., and their nanostructures are mainly core-shell structures and symmetrical structures, such as literature (J.Am.Chem.Soc, 2013, 135, 5588? 5601) reported the use of gold r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24B82Y30/00B82Y40/00
Inventor 程丝章瀚
Owner SUZHOU UNIV
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