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Purification method for gold nano-particles with double-cone structures

A nanoparticle and synthesis method technology, applied in the field of nanomaterial preparation, can solve the problems of insufficient application of gold bipyramid, restricted application of gold bipyramid nanoparticles, inability to achieve separation by centrifugation, etc. effect of operation

Inactive Publication Date: 2013-08-14
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the low purity of the prepared gold bicone and the existence of by-products, the application of gold bicone nanoparticles is restricted.
The commonly used purification method is mainly centrifugation, which is based on the principle that there is a certain degree of difference in the quality or size of nanoparticles. However, for nanoparticles with similar quality or size, centrifugation cannot achieve effective separation.
It is known from existing studies that by changing the surfactant used in the growth solution, the purpose of increasing the yield can be achieved, such as the literature Small, 2007(3), 2103-2113 by using hexadecanoids with larger end groups Alkyl tributylammonium bromide (CTBAB), so that the yield can reach 50-60%, however, such a purity still cannot meet the full application of gold bipyramid

Method used

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  • Purification method for gold nano-particles with double-cone structures
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  • Purification method for gold nano-particles with double-cone structures

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Embodiment 1

[0017] Adopt seed growth method to prepare gold biconical nanoparticles, the steps are: the first step, prepare seed solution: add 0.125ml 0.01M chloroauric acid solution, 0.25ml 0.01M sodium citrate solution into 9.625ml ultrapure water , then add freshly prepared, iced 0.15ml 0.01M sodium borohydride solution, and let stand for 4h. The second step is to prepare the growth solution: add 1.2ml 0.01M chloroauric acid solution, 0.06ml 0.01M silver nitrate solution and 0.402ml 0.1M ascorbic acid solution to 28.5ml 0.01M cetyltributylammonium bromide solution Then add 0.2ml sodium citrate stabilized seed solution and place it at 65°C for 6h to synthesize the initial product of gold bipyramidal nanoparticles mixed solution.

[0018] Purify the initial product of the synthesized gold biconical nanoparticle mixed solution: centrifuge and concentrate the obtained gold biconical nanoparticles, pour off the supernatant, and add the same volume of concentrations of 0.1M, 0.2M, 0.3M, 0.4 ...

Embodiment 2

[0024] Preparation of gold biconical nanoparticles: Add 0.125ml 0.01M chloroauric acid solution and 0.25ml 0.01M sodium citrate solution to 9.625ml ultrapure water, then add freshly prepared, iced 0.15ml 0.01M sodium borohydride Solution, placed for 4h, the preparation of seed solution. Add 1.2ml of 0.01M chloroauric acid solution, 0.06ml of 0.01M silver nitrate solution and 0.402ml of 0.1M ascorbic acid solution to 28.5ml of 0.01M cetyltributylammonium bromide solution in turn to prepare the growth solution. Add 0.6ml sodium citrate stabilized seed solution to the growth solution, and place it at 65° C. for 6 hours to obtain the primary product of gold bipyramidal nanoparticles.

[0025] Purify the synthesized gold biconical nanoparticles: centrifuge and concentrate the obtained gold biconical nanoparticles primary product, pour off the upper clear night, add the same volume of 0.6M CTAB aqueous solution, mix well, and stand at room temperature for 24 hours; put the upper and...

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Abstract

The invention discloses a purification method for gold nano-particles with double-cone structures. The gold nano-particles with stable citric acid serve as seeds, water solution of cationic surface active agents with silver nitrate serves as a growth system, initial gold nano-particle products with the double-cone structures are prepared by a seed growth method, centrifugally concentrated and then added into hexadecyl trimethyl ammonium bromide water solution with the concentration of 0.1M-0.6M, the volume of the initial gold nano-particle products is as same as that of the hexadecyl trimethyl ammonium bromide water solution, the initial gold nano-particle products are uniformly mixed and separated into an upper layer and a lower layer after standing for 24 hours, and the obtained lower layer is provided with pure gold double-cone nano-particle products with the plasma resonance wavelength ranging from 700nm to 1300nm. The double-cone nano-particles with different sizes are purified by adjusting the concentration of hexadecyl trimethyl ammonium bromide, the method is simple, convenient, easy to operate and high in purification efficiency, industrial production can be realized, and the obtained products have large local electric field enhancement and extinction cross sections and can be applied to the technical field of optics and biology.

Description

technical field [0001] The invention relates to a method for purifying nanomaterials, in particular to a method for purifying a gold biconical nanoparticle mixed solution obtained by a synthesis method, and belongs to the technical field of nanomaterial preparation. Background technique [0002] In recent years, nanoparticle-based technologies have been widely used because of their unique optical, electric, and magnetic properties that depend on nanostructures. To make full use of the properties of nanoparticles, it is very critical to find a fast and efficient method to prepare high-purity nanoparticles of specific shape and size. Both the gold rod and the gold bicone exhibit two plasmon resonances, the transverse plasmon resonance and the longitudinal plasmon resonance. At present, there are many methods to prepare high-purity gold rod nanoparticles, which are widely used in the fields of two-photon absorption, biological blood vessel imaging, biosensing and drug release....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 程丝周琳曹敏华范丽娟
Owner SUZHOU UNIV
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