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Preparation method of gold nanoparticles

A gold nanoparticle and gold nanoparticle technology are applied in the field of preparing gold nanoparticles with controllable morphology, which can solve the problems of complex preparation process and conditions, unfavorable precise control of gold nanoparticles, etc., and achieve the effect of reducing cost.

Active Publication Date: 2012-03-14
TSINGHUA UNIV +1
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Problems solved by technology

The Turkevich method is one of the methods for preparing gold nanoparticles by a more classical reduction method (please refer to the literature "The Formation of Colloidal Gold, J Turkevich, P.C.Stevenson, J Hillier, The Journal of Physical Chemistry, Vol.57(1953) 670-673" ), the method introduces that sodium citrate is added into boiling chloroauric acid solution to react to prepare gold nanoparticles. This method has a fast reaction speed and is not conducive to the precise control of the morphology of gold nanoparticles; in addition, 2006 2 In the U.S. patent application that is disclosed on the 2nd, publication number is US20060021468, also discloses a kind of method that prepares gold nanoparticle with sodium citrate reduction, and this method needs to add stabilizing agent such as polyvinylpyrrolidone (PVP) in the process of reaction , making the preparation process and conditions more complicated

Method used

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[0012] The embodiment of the present invention provides a method for preparing gold nanoparticles. The method includes the following steps:

[0013] S1, to provide a gold ion-containing solution and a carboxylic acid solution containing at least two carboxyl groups as a reducing agent and a stabilizer, and

[0014] S2, mixing the gold ion-containing solution and the carboxylic acid solution to form a mixed solution, and reacting at 20°C to 60°C to form a gold nanoparticle colloidal solution.

[0015] In the above step S1, the gold ion-containing solution includes a solvent and a gold source dissolved in the solvent. The solvent includes one or more of water, ethanol, acetone, and chloroform, preferably water or ethanol. The embodiment of the present invention uses water as the solvent. The gold source is preferably chloroauric acid (HAuCl 4 ), gold chloride (AuCl 3 ) And potassium chloroaurate (KAuCl 4 ) One or more of. The embodiment of the present invention uses HAuCl 4 As the so...

Embodiment 1

[0035] Preparation of gold nanosheets

[0036] The reactor was immersed with aqua regia, and washed with deionized water several times to remove the residual aqua regia in the reactor. The reactor was heated in a water bath at 50°C, and then the C was added at the molar ratio of the gold ion to the carboxylic acid 1:1. 6 H 8 O 7 Add HAuCl to the solution at once 4 A mixed solution is formed in the aqueous solution, and the pH of the mixed solution is adjusted to 3 with a hydrochloric acid solution, and the colloidal solution of gold nano particles produced by the reaction is obtained by sampling at different times. The sampling time is T = 30 minutes, T = 45 minutes, T = 150 minutes and T = 330 minutes. The sampled sample is immediately cooled with 4°C cold water to stop the reaction, and placed for 2 days before taking a TEM photo, please refer to figure 1 (a)~(d).

Embodiment 2

[0038] Preparation of gold nano mesh

[0039] The preparation process of the gold nano-mesh is the same as that of the above-mentioned embodiment 1, except that the pH of the mixed solution is adjusted to 5 with hydrochloric acid solution. The sampling time is T=3 minutes and T=24 hours. The sampled sample is immediately cooled with 4°C cold water to stop the reaction, and placed for 2 days before taking a TEM photo, please refer to figure 2 (a) and figure 2 (b).

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Abstract

The invention relates to a preparation method of gold nanoparticles. The method comprises the following steps of providing gold-ion-contained solution and carboxylic acid solution containing at least two carboxyl used as reducing agent and stabilizer; mixing the gold-ion-contained solution and the carboxylic acid solution to form into mixed solution; reacting the mixed solution at a temperature being 20 DEG C to 60 DEG C, and generating gold nanoparticle colloid solution.

Description

Technical field [0001] The invention relates to a method for preparing gold nanoparticles, in particular to a method for preparing gold nanoparticles with controllable morphology. Background technique [0002] Gold nanoparticles have unique physical and chemical properties due to their small size effect, surface effect, quantum size effect and quantum tunneling effect. They have broad application prospects in optics, electricity and magnetism, and can be used as catalysts and some pharmaceutical preparations. And the sensing and measuring medium of biosensors. [0003] The properties of gold nanoparticles depend on factors such as the shape and size of gold nanoparticles. Therefore, it is extremely challenging to better control the shape and size of gold nanoparticles while preparing gold nanoparticles. [0004] The preparation methods of gold nanoparticles in the prior art are divided into physical methods and chemical methods. The physical methods mainly include vacuum evaporation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/0545
CPCB22F9/24B82Y30/00C22C5/02B22F1/0553B22F1/0551B22F1/0545
Inventor 郭建伟何向明王诚刘志祥蒲薇华李建军
Owner TSINGHUA UNIV
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