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Method for preparing nano-gold

A technology of nano-gold and chloroauric acid, applied in the field of metal nanoparticle preparation, can solve the problems of fast reduction, uncontrollable, lack of controllability, etc., and achieve the effect of simple preparation method and controllable speed

Inactive Publication Date: 2013-03-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reductant used includes inorganic reductant and organic reductant. The commonly used inorganic reductant is sodium borohydride with strong reducibility, which needs additional stabilizer. The reduction speed is fast but uncontrollable; the commonly used organic reductant is citric acid. It acts as a stabilizer at the same time, but it can only be reduced at high temperature, and the reduction rate is difficult to control
Although a variety of methods for the preparation of gold nanoparticles have been developed based on a variety of reducing agents, there is still a lack of controllability in terms of reduction and growth rate of gold nanoparticles.

Method used

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  • Method for preparing nano-gold
  • Method for preparing nano-gold
  • Method for preparing nano-gold

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1, the preparation of nano gold

[0023] At 10°C, add 1 mL of glutaraldehyde aqueous solution (containing 20 mg of glutaraldehyde) to 10 mL of chitosan in acetic acid solution (containing 100 mg of chitosan, the average molecular weight of chitosan is 45 kDa), and after reacting for 1 h, add 0.5 mLHAuCl 4 Aqueous solution (containing 5mg HAuCl 4 ), then the mass fraction ratio of chloroauric acid, chitosan and glutaraldehyde is 1: 20: 4, stirs 4h, obtains the red nano-gold solution, records the maximum absorption at 526nm on the ultraviolet-visible spectrophotometer place, such as figure 1 Shown; After treatment, the nano gold can be obtained, and its transmission electron microscope picture is as follows figure 2 As shown, its particle size is 7nm-20nm.

Embodiment 2

[0024] Embodiment 2, the preparation of nano gold

[0025] At 45°C, 0.5mL HAuCl 4 Aqueous solution (containing 5mg HAuCl 4 ) into the acetic acid solution of 10mL chitosan (containing 100mg chitosan, the molecular weight of chitosan is 45kDa), then add 1mL glutaraldehyde aqueous solution (containing 20mg glutaraldehyde), then chloroauric acid, chitosan The mass fraction ratio with glutaraldehyde is 1: 20: 4, stirs 0.5h, obtains the red nano-gold solution, records the maximum absorption at 532nm on the ultraviolet-visible spectrophotometer, as image 3 Shown; After treatment, the nano gold can be obtained, and its transmission electron microscope picture is as follows Figure 4 As shown, its particle size is 6nm-25nm.

Embodiment 3

[0026] Embodiment 3, the preparation of nano gold

[0027] At 25°C, 0.5mL HAuCl 4 Aqueous solution (containing 5mg HAuCl 4 ) into 10mL bovine serum albumin aqueous solution (containing 100mg bovine serum albumin, the molecular weight of bovine serum albumin is 66kDa), then add 1mL glutaraldehyde aqueous solution (containing 20mg glutaraldehyde), then chloroauric acid, bovine serum The mass fraction ratio of albumin and glutaraldehyde is 1: 20: 4, stirs 3h, obtains the red nano-gold solution, records the maximum absorption at 536nm place on the ultraviolet-visible spectrophotometer, and the nano-gold particle diameter is 11nm -33nm.

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Abstract

The invention provides a method for preparing nano-gold, which comprises the following step of: reacting chloroauric acid with a primary-amine-containing compound and an aldehyde-containing compound to obtain the nano-gold. The invention provides a method for preparing the nano-gold through reductive amination reaction. The aldehyde-containing compound and the primary-amine-containing compound which participate in the reductive amination reaction cannot reduce the chloroauric acid into the nano-gold under the reaction conditions, the reductive amination reaction makes a reaction system have the capability of reducing the chloroauric acid, and is accompanied with the generation of the nano-gold, other reducing agents and a stabilizer for the nano-gold are not required to be added, and the reduction speed and the generation speed of the nano-gold can be regulated by controlling the conditions of the reductive amination reaction. The method for preparing the nano-gold is simple, the speed is controllable, and a new way is provided for preparing the nano-gold.

Description

technical field [0001] The invention relates to a method for preparing nano-gold, which belongs to the field of metal nano-particle preparation. Background technique [0002] Due to its unique physical and chemical properties, gold nanoparticles have attracted great attention in recent years and are widely used in optics, catalysis, biomedicine and other fields. As far as the preparation of nano-gold is concerned, the chemical reduction method in aqueous phase is mostly used, that is, the chloroauric acid is reduced to nano-gold by a reducing agent in the presence of a stabilizer. The reductant used includes inorganic reductant and organic reductant. The commonly used inorganic reductant is sodium borohydride with strong reducibility, which needs additional stabilizer. The reduction speed is fast but uncontrollable; the commonly used organic reductant is citric acid. It also acts as a stabilizer, but it can only be reduced at high temperature, and the reduction rate is diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 邱昌桂郭振朋陈义
Owner INST OF CHEM CHINESE ACAD OF SCI
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