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A kind of bicone structure gold nanoparticle and preparation method thereof

A gold nanoparticle and nanoparticle technology, applied in the field of nanomaterials, to achieve good electromagnetic field enhancement performance, large size adjustment range, and high purity

Active Publication Date: 2017-11-03
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 surface. Biconical gold nanoparticles have not been reported

Method used

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  • A kind of bicone structure gold nanoparticle and preparation method thereof
  • A kind of bicone structure gold nanoparticle and preparation method thereof
  • A kind of bicone structure gold nanoparticle and preparation method thereof

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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 of gold bicone is at 800-850nm) at 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 curved-edged gold biconical ...

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Abstract

The invention discloses a double-cone structure gold nanoparticle and a preparation method thereof. The nanoparticle has a five-sided concave curved side double cone structure, the surface of the nanoparticle is concave, and the edge is wavy. Using the gold bipyramid as a template, chloroauric acid solution and silver nitrate solution as metal precursors, the re-growth method is used to adjust the reduction and deposition of gold elements on different parts of the pyramid surface, and prepare gold nanoparticles in the shape of concave curved side bipyramids. In the present invention, gold nanoparticles with a concave biconical structure make gold atoms selectively grow mainly on the edge of the biconical template through the principle of underpotential deposition; meanwhile, the surface of the biconical grows gradually in the horizontal and axial directions. The gold nanoparticle with concave structure provided by the invention has excellent optical properties, and its surface plasmon resonance wavelength is tunable.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F1/07
Inventor 程丝康小林
Owner SUZHOU UNIV
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