Method for preparing gold and silver nanoparticles with hydro-thermal method

A silver nanoparticle and hydrothermal technology, applied in the preparation of silver nanoparticles and gold fields, can solve the problems of complex preparation process, many steps and high cost, and achieve the effects of simple process, low cost and adjustable particle size.

Inactive Publication Date: 2011-10-05
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of these methods are mainly based on organic solvents, which have pollution problems; some require inert atmosphere or boiling heating, and the preparation process is complicated; some require surfactants or organic protective agents, which are costly and have many steps

Method used

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Examples

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example 1

[0015] Example 1: Add 20 μl of 0.1M sodium citrate aqueous solution and 20 μl of 0.025M chloroauric acid aqueous solution to 15.0ml of deionized water, place them in a 40ml stainless steel pressure-resistant reaction kettle, and react at 120°C for 20 minutes, the resulting precipitate It was separated by high-speed centrifugation, washed with deionized water and absolute ethanol, evaporated and dried to obtain a black-red powder. figure 1 It can be seen that its morphology is nanoparticles with a narrow particle size distribution, and the average particle size is 15 nm. The diffraction peak of its powder X-ray diffraction pattern is consistent with the diffraction peak of gold standard pattern, shows that this product does not have other impurity ( figure 2 ).

example 2

[0016] Example 2: Add 200 μl of 0.1M sodium citrate aqueous solution and 200 μl of 0.025M chloroauric acid aqueous solution to 15.0ml of deionized water, place them in a 40ml stainless steel pressure-resistant reaction kettle, and react at 120°C for 10 hours to obtain a precipitate It was separated by high-speed centrifugation, washed with deionized water and absolute ethanol, evaporated and dried to obtain a black-red powder. The TEM electron microscope image shows that its morphology is nanoparticles with narrow particle size distribution, and the average particle size is 20nm.

example 3

[0017] Example 3: Add 100 μl of 0.1M sodium citrate aqueous solution and 100 μl of 0.05M silver nitrate aqueous solution to 15.0ml deionized water, place them in a 40ml stainless steel pressure-resistant reactor, and react at 180°C for 10 hours. Centrifuge at high speed, wash with deionized water and absolute ethanol, evaporate and dry to obtain a yellow powder. image 3 It can be seen that they are nanoparticles with different shapes, and the average particle diameter is 43nm. The diffraction peak of its powder X-ray diffraction figure is consistent with the diffraction peak of silver standard figure, shows that this product does not have other impurity ( Figure 4 ).

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Abstract

The invention provides a method for preparing gold and silver nanoparticles with a hydro-thermal method. The method comprises the following step of: reducing metal ions into corresponding metal nanoparticles by taking citric acid as a reducing agent under a hydro-thermal condition. The method has a simple process and low cost; and the prepared gold and silver nanoparticles are crystalline and have high purities and controllable particle diameters. The method can be applied to the fields such as chemical catalysis, cosmetics and biology and the like.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, and in particular relates to a preparation method of gold and silver nanoparticles. Background technique [0002] Gold and silver nanoparticles are widely used in chemical catalysis, cosmetics, biology and other fields. The atoms located on the grain boundary and surface of the grains account for a considerable proportion, and have the characteristics of large specific surface area, high surface energy and photocatalysis. , with better catalytic performance. A variety of methods for synthesizing gold and silver nanoparticles have been developed at home and abroad. The aqueous solution of gold ions is reduced by citric acid under boiling conditions to generate gold nanoparticles. Japan Moon S.Y. et al. introduced cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) surfactants under hydrothermal conditions to prepare gold nanoparticles with different morphologies. Peng Zi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 周有福洪茂椿江飞龙陈莲
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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