Preparation method of nano-gold particle

A gold nanoparticle and gold particle technology, applied in the field of gold nanoparticle preparation, can solve problems such as many steps, and achieve the effects of fast reaction, low preparation cost and mild reaction conditions

Inactive Publication Date: 2004-07-21
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although there have been many reports on the preparation methods of gold nanoparticles, these methods generally require the use of a large amount of polymers or special chemical reagents (su

Method used

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  • Preparation method of nano-gold particle
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  • Preparation method of nano-gold particle

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Embodiment Construction

[0011] see figure 1 , so that the HAuCl 4 Add basic CH 3 NO 2 aqueous solution as an example, 0.6 μl CH 3 NO 2 Dissolve in 5ml of distilled water to make nitromethane aqueous solution, stir and add 20μl of 1mol / l NaOH or KOH aqueous solution, the pH value of the solution is 11.06, after stirring for 2 minutes, add 25μL of 24mmol / l HAuCl 4 The aqueous solution has obvious color change within a few seconds, and the light brown gold nanoparticle hydrosol obtained by continuing to stir for 30 minutes.

[0012] Using the above method, changing the pH value of the solution can obtain hydrosols of different colors. For example, when the volumes of 1mol / l NaOH aqueous solution are added to 20 μl, 40 μl, 60 μl and 80 μl respectively, the pH values ​​of the solutions are 11.06, 11.82, 12.26 and 12.43 respectively, and the colors of the aqueous sols of gold nanoparticles thus prepared are orange in turn. , Red, Purple And Blue.

[0013] The color of the sol of metal nanoparticles ...

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Abstract

A process for preparing the gold nanoparticles features that the chlorauric acid or gold chloride is added to the alkaline aqueous solution of nitromethane to obtain the aqueous sol of gold nanoparticles. Its advantages are adjustable granularity, high speed and low cost.

Description

technical field [0001] The invention relates to a preparation method of gold nanoparticles. Background technique [0002] Gold nanoparticles have important applications in many fields such as catalysis, electronic and optical devices, and biotechnology. Taking the field of catalysis as an example, gold does not have high activity as a catalyst, but when the size of gold particles is less than 10nm, its catalytic activity is surprisingly improved, showing extremely high catalytic performance for many oxidation and reduction reactions. For example, α-Fe 2 o 3 or TiO 2 Oxidation of CO to CO by supported nano-gold catalysts 2 This important reaction has extremely high catalytic activity and can completely oxidize CO at -70 °C. [0003] Although there have been many reports on the preparation methods of gold nanoparticles, these methods generally require the use of a large amount of polymers or special chemical reagents (such as long-chain thiols or long-chain amines) as pro...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 庄林陈酉贵陆君涛
Owner WUHAN UNIV
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