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Preparation method and application of multi-sized monodisperse gold nanoparticles

A gold nanoparticle, monodisperse technology, applied in the field of nanomaterials, can solve the problems of wide distribution range and poor monodispersity of gold nanoparticles, and achieve the effects of improving agglomeration, high commercial value, and efficient preparation

Active Publication Date: 2017-06-13
江苏台益纳米科技有限公司
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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a preparation method of multi-size, monodisperse gold nanoparticles, which can gradually obtain nitrogen-dispersed gold nanoparticles with different particle sizes through the seed crystal growth synthesis method, and solve the problem of the distribution of gold nanoparticles of 30nm and above. Problems with broad range and poor monodispersity

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  • Preparation method and application of multi-sized monodisperse gold nanoparticles
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  • Preparation method and application of multi-sized monodisperse gold nanoparticles

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[0029] The invention provides a preparation method of multi-size monodisperse gold nanoparticles, comprising the following steps:

[0030] (1) Under the action of citrate and a reducing agent, the gold salt is subjected to a reduction reaction in water to obtain gold nanoparticle crystal seeds;

[0031] (2) mixing chloroauric acid, citrate, surfactant and water to obtain a seed growth solution;

[0032] (3) Under the condition of the second reducing agent, iteratively growing the gold nanoparticle seed crystals in the seed crystal growth solution to obtain multi-sized gold nanoparticles;

[0033] The reducing property of the first reducing agent is greater than or equal to the reducing property of the second reducing agent;

[0034] The steps (1) and (2) are not limited by time sequence.

[0035] In the present invention, under the action of citrate and the first reducing agent, the gold salt is subjected to reduction reaction in water to obtain gold nano particle crystal se...

Embodiment 1

[0063] (1) Preparation of gold nanoparticle seed crystals: 2mg of gold monochloride powder and 2mg of sodium citrate solid were added to 20mL of water, magnetically stirred for 5 minutes under ice bath conditions at 0°C, and then 2.5g of sodium borohydride solid powder was added , stirred in an ice bath for 30 minutes to obtain gold nanoparticle seed crystals, named sample A;

[0064] (2) Preparation of gold nanoparticle growth solution: at room temperature, 20 mg of chloroauric acid solid powder was added to 200 mL of water, then 2 g of sodium citrate and 6 g of cetyltrimethylammonium bromide powder were added, magnetically stirred 30 minutes to obtain the seed crystal growth solution;

[0065] (3) Preparation of gold nanoparticles with different particle sizes:

[0066] ① Take 7.5mL of the seed crystal growth solution obtained in the above step (2) in a beaker, add 1g of ascorbic acid powder therein, and stir it magnetically for 5 minutes, then take 2.5mL of the sample A ob...

Embodiment 2

[0074] (1) Preparation of gold nanoparticle seed crystals: 20 mg of chloroauric acid powder and 20 mg of potassium citrate were added to 20 mL of water, stirred magnetically for 5 minutes in an ice bath at 0° C., then added 5 g of lithium aluminum hydride solid powder, and Stir in the bath for 120 minutes to obtain gold nanoparticle seed crystals, named as sample A;

[0075] (2) Preparation of gold nanoparticle growth solution: at room temperature, 500 mg of chloroauric acid solid powder was added to 200 mL of water, then slowly added 10 g of potassium citrate and 20 g of cetyltrimethylammonium chloride powder, magnetically Stir for 50 minutes to obtain a seed crystal growth solution;

[0076] (3) Preparation of gold nanoparticles with different particle sizes:

[0077] ① Take 10mL of the seed crystal growth solution obtained in the above step (2) in a beaker, add 2g of sodium thiosulfate powder to it, and stir it magnetically for 10 minutes, then take 5mL of the sample A obt...

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Abstract

The invention provides a preparation method of multi-sized monodisperse gold nanoparticles. The preparation method of the multi-sized monodisperse gold nanoparticles includes the steps of (1) subjecting gold salt to a reduction reaction in water under the joint action of citrate and a first reducing agent to obtain seed crystals of the gold nanoparticles; (2) mixing chloroauric acid, citrate and a surfactant with water to obtain seed crystal growth liquid; (3) subjecting the seed crystals of the gold nanoparticles to iterative growth in the seed crystal growth liquid under the action of a second reducing agent so as to obtain the multi-sized gold nanoparticles. The preparation method and application of the multi-sized monodisperse gold nanoparticles have the advantages that with the surfactant coating the different particle diameters of monodisperse gold nanoparticles evenly during gradual growth, particle agglomeration is improved, and the problems that the gold nanoparticles with large particle diameters are widely dispersed and poor in monodispersity are solved, so that the gold nanoparticles can give full play to a photo-thermal transformation performance under a light condition.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method and application of multi-size monodisperse gold nanoparticles. Background technique [0002] Gold nanoparticles are an intermediate between metal blocks and atoms, exhibit special chemical, electronic and physical properties, and have good stability, small size effect, surface effect, optical effect and special biological affinity. and sex. In addition, gold nanoparticles are also a light-to-heat conversion material. Under the irradiation of sunlight, the electron density wave generated by the interaction between free vibrating electrons existing on the metal surface and photons resonates, that is, surface plasmon resonance. , can convert light and heat into thermal energy generated by vibration. Gold nanoparticles have also attracted in-depth research in other fields due to their excellent surface plasmon resonance properties, such as photothermal me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 王贤保郭安康梅涛李金华王建颖
Owner 江苏台益纳米科技有限公司
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