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Bipyramid structure gold nanoparticle and preparation method thereof

A technology of gold nanoparticles and nanoparticles, applied in the field of nanomaterials, to achieve the effects of simple process conditions, high purity, and large size adjustment range

Active Publication Date: 2016-04-06
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the concave structures of noble metals are mostly derived from tetrahedron, hexahedron, octahedron and dodecahedron. The noble metals are usually Pd and Pt, and the designed and synthesized plasmon resonance wavelength is in the near-infrared region, and the edge is a concave surface with a wavy high-index crystal plane. Biconical gold nanoparticles have not been reported

Method used

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  • Bipyramid structure gold nanoparticle and preparation method thereof
  • Bipyramid structure gold nanoparticle and preparation method thereof
  • Bipyramid structure gold nanoparticle and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Centrifuge 1mL solution of pure gold biconical nanoparticles with an absorbance of 1.4-2.0 (the characteristic absorption peak position of the gold bicone is at 800-850nm) at a speed of 6800-7400rpm for 8-12min, and then disperse in 1mL, 0.01M Hexaalkyltributylammonium bromide (CTBAB) solution, shake well, set aside.

[0023] Take 1mL, 0.01M cetyltributylammonium bromide (CTBAB) solution, add 40~80uL, 0.01M chloroauric acid (HAuCl 4 ) solution, 8 ~ 16uL, 0.01M silver nitrate (AgNO 3 ) solution, add 14-30uL, 0.01M ascorbic acid (AA) solution, shake well, add 100-200uL of biconical solution obtained in step 1, shake well, place at 65°C for 6-8h, centrifuge and concentrate, you can get Gold bipyramidal nanoparticles with concave curved edges in different sizes.

[0024] The prepared nanoparticles were subjected to morphology analysis, see attached figure 1 and 2 , figure 1 Among them, pictures a and b are the scanning electron microscope (SEM) pictures of concave cu...

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Abstract

The invention discloses a bipyramid structure gold nanoparticle and a preparation method thereof. The gold nanoparticle is characterized in that the gold nanoparticle is in a pentagonal concave-surface curve-edge bipyramid structure; the surface of the gold nanoparticle is in an inner sunken shape; and the edge of the gold nanoparticle is wavy. By taking a gold bipyramid as a template, and a chloroauric acid solution and a silver nitrate solution as metal precursors, reduction deposition of gold elements in different parts of the surface of the bipyramid is adjusted by a regrowth method, and the gold nanoparticle in a concave-surface curve-edge bipyramid shape is obtained. According to the gold nanoparticle in the pentagonal concave-surface curve-edge bipyramid structure, through the underpotential deposition principle, gold atoms mainly and selectively grow at the edges of the bipyramid template; in addition, the surfaces of the bipyramid gradually grow in the transverse and axial directions. The gold nanoparticle in the pentagonal concave-surface curve-edge bipyramid structure has excellent optical properties, and the plasma resonance wavelength of the surface of the gold nanoparticle can be adjusted.

Description

technical field [0001] The invention relates to a metal nanoparticle and a preparation method thereof, in particular to a metal nanoparticle with a concave curved edge and a preparation method thereof, belonging to the technical field of nanomaterials. Background technique [0002] Due to their unique optical, electric, and magnetic properties, noble metal nanoparticles have received extensive attention and applications in recent years. However, the structure and morphology of metal nanoparticles have a very important impact on their properties and applications. Therefore, the shape control of nanostructures has always been a hot spot in the field of nanomaterials. So far, noble metal nanoparticles have spherical, rod, linear, cone, cubic, etc., and noble metal nanoparticles with different shapes have different optical properties. For example, isotropic gold nanoparticles such as spheres have one plasmon resonance wavelength, while anisotropic gold nanoparticles such as gol...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/07
Inventor 程丝康小林
Owner SUZHOU UNIV
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