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Ultrasonic preparation method of gold/porous palladium core-shell structure nanoparticles

A gold nanoparticle, core-shell structure technology is applied in the field of ultrasonic preparation of gold/porous palladium core-shell structure nanoparticles, which can solve the problems of difficult control of nanoparticle size and morphology, long reaction time, high reaction temperature, etc. The effect of strong controllability of morphology and particle size, mild reaction conditions, and simple process

Inactive Publication Date: 2019-06-11
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method has a long reaction time or requires a high reaction temperature, and the size and shape of the prepared nanoparticles are difficult to control. Therefore, a rapid and mild reaction condition is developed to prepare gold / porous palladium core-shell nanoparticles. method is crucial

Method used

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  • Ultrasonic preparation method of gold/porous palladium core-shell structure nanoparticles
  • Ultrasonic preparation method of gold/porous palladium core-shell structure nanoparticles
  • Ultrasonic preparation method of gold/porous palladium core-shell structure nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100 mL of 0.01% chloroauric acid aqueous solution and heat to boiling, and then quickly add 3 mL of 1% sodium citrate solution. Keep boiling for 15 minutes, and cool the solution to room temperature to obtain a hydrosol of gold nanoparticles.

[0029] Weigh 0.0177 g of palladium chloride and dissolve it in 2 mL of 50.0 mmol / L hydrochloric acid solution, and then add deionized water to dilute to 100 mL to prepare a 1.0 mmol / L chloropalladic acid solution.

[0030] Mix 0.06g of polyethylene glycol (PEG 4000), 0.25mL of 1.0mmol / L chloropalladic acid solution and 1mL of 100mmol / L ascorbic acid solution in 20mL of deionized water, and then slowly drop 1mL of gold sol Solution. Then, it was reacted for 0.5 hours under 200W ultrasonic conditions, and finally the product was cleaned and separated to obtain gold / porous palladium core-shell structured nanoparticles.

[0031] The product obtained in this example was observed under a transmission electron microscope, and the result...

Embodiment 2

[0033] The process is similar to that of Example 1, but when preparing gold / porous palladium core-shell structure nanoparticles, the ultrasonic power is changed to 800W, and other reaction conditions are kept unchanged. figure 2 This is a transmission electron microscope image of the product obtained in this example. It can be seen from the image that the porous structure of the palladium shell layer is significantly different from that of the product of Example 1.

Embodiment 3

[0035] The process is similar to that of Example 1, but when preparing gold / porous palladium core-shell structure nanoparticles, 0.06g polyethylene glycol (PEG 4000) is changed to 0.36g cetyltrimethylammonium chloride, Keep other reaction conditions unchanged. image 3 This is a transmission electron microscope image of the product obtained in this example. Compared with the structure of the product of Example 1, the shell layer has a larger palladium particle size and a denser porous structure.

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Abstract

The invention discloses an ultrasonic preparation method of gold / porous palladium core-shell structure nanoparticles, which comprises the following steps: 1. heating a chloroauric acid aqueous solution until boiling under stirring, quickly adding a sodium citrate solution, keeping boiling for 15 minutes, and cooling to room temperature to obtain gold nanoparticle hydrosol; 2, dissolving palladiumchloride in a hydrochloric acid solution, and adding deionized water for dilution to prepare a chloropalladic acid; 3, adding a surfactant, the chloropalladic acid solution and an ascorbic acid solution into deionized water, and slowly dropwise adding the gold sol solution to obtain a mixed solution; 4, putting the mixed solution into a reaction kettle, and carrying out ultrasonic reaction for 0.5-2 hours to obtain particles; and cleaning and separating the particles to obtain the gold / porous palladium core-shell structure nanoparticles. The synthesis method provided by the invention is simpleand convenient to operate, and the obtained gold / porous palladium core-shell structure nanoparticles are good in dispersity and controllable in morphology and size.

Description

Technical field [0001] The invention belongs to the technical field of metal composite nanomaterials, and specifically relates to an ultrasonic preparation method of gold / porous palladium core-shell structure nanoparticles. Background technique [0002] The design and construction of metal composite nanomaterials with a core-shell structure has been a major research focus in the field of materials science in recent years. The reason why such materials are so favored by researchers is that they have many unique properties. For example, the particle size, shape, composition and surface properties of metal composite nanomaterials with a core-shell structure can be adjusted. Therefore, many properties of metal composite nanomaterials can be adjusted to a large extent through reasonable design of experimental conditions. . The core-shell structured metal composite nanomaterial as a catalyst has the advantages of high catalytic activity, selectivity and stability, so it has very attr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/06
Inventor 杨建辉
Owner NORTHWEST UNIV(CN)
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