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Preparation method of high-purity gold nanobicones and composite nanomaterials thereof

A composite nanomaterial and gold nanotechnology, applied in the field of nanomaterials, can solve the problems of low yield of gold nanobipyramid, and achieve the effects of rich physical and chemical properties, controllable shell thickness and wide application range.

Active Publication Date: 2015-09-30
NANOSEEDZ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The application of the present invention is aimed at the problem that the yield of gold nano-bipyramids prepared by the seed growth method is low at present, and proposes a method for preparing and purifying gold nano-bipyramids with simple operation, high repeatability and high yield.

Method used

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  • Preparation method of high-purity gold nanobicones and composite nanomaterials thereof
  • Preparation method of high-purity gold nanobicones and composite nanomaterials thereof
  • Preparation method of high-purity gold nanobicones and composite nanomaterials thereof

Examples

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Embodiment 1

[0049] First prepare the following solutions:

[0050] 1. 0.01M sodium citrate aqueous solution: Weigh 0.2941g sodium citrate (analytical pure) and dissolve it in 100mL deionized water to make it fully dissolved to form a colorless transparent solution;

[0051] 2. 0.01M tetrachloroauric acid aqueous solution: weigh 0.393g tetrachloroauric acid (analytical pure) and dissolve in 100mL deionized water;

[0052] 3. 0.1M cetyltrimethylammonium bromide aqueous solution: weigh 14.6g cetyltrimethylammonium bromide (analytical pure) and dissolve it in 400mL deionized water, heat and stir to fully dissolve to form a colorless Transparent solution, after filtering for later use;

[0053] 4. 0.08M cetyltrimethylammonium chloride aqueous solution: weigh 20g cetyltrimethylammonium chloride concentrated solution (mass fraction is 25%), dissolve in 175.31mL deionized water;

[0054] 5. 0.01M silver nitrate aqueous solution: Weigh 0.17g silver nitrate (analytical pure) and dissolve in 100mL...

Embodiment 2-5 10

[0067] The concentration of embodiment 2-5 cetyltrimethylammonium bromide affects the purity of gold nano bipyramids

Embodiment 2

[0069] In this embodiment, except that the concentration of cetyltrimethylammonium bromide added in the purification step is 0.1M, the remaining steps are the same as in Example 1, and the purity of the obtained high-purity gold nanobipyramid is 85%.

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Abstract

The invention provides a method which is efficient, suitable for large-scale production and used for purifying a conventional low-yield gold nanoparticle bipyramid and preparing a composite nanomaterial of the gold nanoparticle bipyramid. The purity of the obtained gold nanoparticle bipyramid reaches up to 97%. According to the method, quality difference between the gold nanoparticle bipyramid and impurities is increased according to different growth rates of silver on the surfaces of the gold nanoparticle bipyramid and the impurities, so that separation of the gold nanoparticle bipyramid and the impurities is realized with a sedimentation or centrifugation method; then a silver shell layer on the surface of the gold nanoparticle bipyramid is removed with ammonia water and hydrogen peroxide, so that the gold nanoparticle bipyramid with the purity reaching up to 97% and an excellent optical property is obtained; and the gold nanoparticle bipyramid composite nanomaterial cladded with silicon dioxide, titanium dioxide, cerium dioxide and cuprous oxide is further prepared through hydrolysis of ethyl orthosilicate, a soluble titanium source, a soluble titanium source and a soluble copper source respectively.

Description

technical field [0001] The application of the present invention relates to a high-yield gold nano-bipyramid, its preparation and purification method, and a method for preparing a composite nano-material by using the obtained gold nano-bipyramid, belonging to the technical field of nano-materials. Background technique [0002] Gold nanorods are rod-shaped gold nanoparticles with a size ranging from a few nanometers to hundreds of nanometers. Gold is a noble metal material with very stable chemical properties. Gold nanoparticles inherit this property of its bulk material, so it has relatively stable but very rich chemical and physical properties. Gold nanorods have continuously adjustable surface plasmon resonance wavelengths from visible (550nm) to near-infrared (1550nm) with the change of aspect ratio, extremely high surface electric field intensity enhancement effect (up to 10e7 times), and great optical properties. Absorption, scattering cross section, and continuously ad...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02C30B29/02C30B29/60C30B7/14
Inventor 李倩江瑞斌卓晓璐王建方
Owner NANOSEEDZ
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