Low-temperature water-phase preparation method for porous gold nanocrystals

A water-phase preparation and gold nanotechnology, which is applied in metal processing equipment, transportation and packaging, etc., to achieve high activity, reduce preparation costs, and increase physical and chemical properties

Inactive Publication Date: 2016-05-11
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are few reports on the preparation of gold nanocrystals with porous stru

Method used

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  • Low-temperature water-phase preparation method for porous gold nanocrystals
  • Low-temperature water-phase preparation method for porous gold nanocrystals
  • Low-temperature water-phase preparation method for porous gold nanocrystals

Examples

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Effect test

Embodiment 1

[0030] First, pour a mixed solution of 0.33ml of 0.74mol / L sodium citrate and 0.165ml of 1.2mol / L sodium carbonate and 5ml of deionized water into a beaker, and place it in an ice-water mixed water bath at 0°C for magnetic stirring for 1 hour;

[0031] Then, drop 0.33ml0.68mol / L of chloroauric acid and continue to stir for 4h. The solution was golden yellow in the first two hours without any change. After two hours, the solution began to gradually turn black from golden yellow. The color of the solution gradually deepens, and the whole process is carried out in a water bath environment mixed with ice and water at 0°C;

[0032] Finally, it was placed in an ice-water mixed water bath environment at 0°C for precipitation for 30 hours, centrifuged and washed at room temperature to obtain porous gold nanocrystals. like figure 1 and figure 2 Shown are field emission scanning electron micrographs and transmission electron micrographs of porous gold nanocrystals, respectively.

Embodiment 2

[0034] First, pour a mixed buffer solution of 0.33ml of 0.74mol / L sodium citrate and 0.165ml of 1.2mol / L sodium carbonate and 5ml of deionized water into a beaker, and place it in an ice-water mixed water bath at 0°C for 1 hour with magnetic stirring ;

[0035] Then, drop 0.33ml0.68mol / L of chloroauric acid and continue to stir for 4h. The solution was golden yellow in the first two hours without any change. After two hours, the solution began to gradually turn black from golden yellow. The color of the solution gradually deepens, and the whole process is carried out in a water bath environment mixed with ice and water at 0°C;

[0036] Finally, put it in a 0°C ice-water mixed water bath environment for 72 hours, and make full use of effective kinetic control to achieve effective control of the shape of gold nanocrystals, so that the gold nanocrystals can be transformed from gold nanoparticles to porous gold nanocrystals. Transition to multiple morphologies of sheet-like nonpo...

Embodiment 3

[0038] First, add 0.33ml0.74mol / L sodium citrate to each of the five beakers, then add 0.33ml1.2mol / L sodium carbonate solution, 0.25ml1.2mol / L sodium carbonate solution, 0.16ml1.2mol / L sodium citrate L of sodium carbonate solution, 0.08ml of 1.2mol / L sodium carbonate solution, 0ml of 1.2mol / L sodium carbonate solution (that is, no sodium carbonate solution), then add 5ml of deionized water respectively, and place in ice water at 0°C Magnetic stirring in a mixed water bath environment for 1h;

[0039] Then, drop respectively the chloroauric acid of 0.33ml0.68mol / L in 5 beakers, continue magnetic stirring 4 hours;

[0040] Finally, the samples were placed in an ice-water mixed water bath at 0°C for 4 hours, centrifuged and washed at room temperature to obtain gold nanocrystals with different shapes. When the amount of sodium carbonate solution used is 0.33ml, gold nanoparticles with smaller size will be formed; when the amount of sodium carbonate solution used is 0ml and other...

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Abstract

The invention discloses a low-temperature water-phase preparation method for porous gold nanocrystals, and belongs to the technical field of synthesis methods for porous nanostructures of precious metals. The low-temperature water-phase preparation method comprises the following steps: pouring sodium citrate solution, sodium carbonate solution and deionized water into a beaker, and placing the beaker in an ice-water mixed water bath environment at 0 DEG C and stirring for 1 hour; dripping chloroauric acid, and continuing to stir for 4 hours; then settling in the ice-water mixed water bath environment at 0 DEG C for 2-72 hours, and carrying out centrifuging and sample washing at a room temperature to obtain the gold nanocrystals. The porous gold nanocrystals prepared by the preparation method disclosed by the invention are of a porous structure, large in specific surface area, high in activity, high in permeability, capable of greatly improving the various physicochemical properties thereof, and adjustable in morphology. The method disclosed by the invention is green and environment-friendly, and simple and efficient.

Description

technical field [0001] The invention belongs to the technical field of synthesis methods of noble metal porous nanostructures, and relates to a method for preparing high-quality porous gold nanocrystals in a low-temperature, simple, green, environmentally friendly and sustainable water phase. Background technique [0002] For a long time, porous nanostructures have been a hot topic in the field of scientific research. Due to their large specific surface area, relatively small density and good permeability, they are widely used in catalysis, sensors, drug delivery, and energy conversion and storage. Caused widespread concern. Many previous reports prepared porous noble metal nanomaterials in the form of templates or dealloying. Since the post-processing of the template and dealloying increases the complexity of the synthesis process and is full of risks of introducing impurities, it will also have a certain impact on its subsequent application effect. [0003] Gold is a typ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24C22C2200/04B22F1/054
Inventor 隋永明徐满刘欣美邹勃
Owner JILIN UNIV
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