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A kind of preparation method of platinum-coated silver core-shell structure nanoparticles

A core-shell structure and nanoparticle technology, applied in the direction of nanotechnology, can solve the problems of easy replacement reaction, destruction of the original structure, coating, etc., and achieve the effect of small demand, reduced reaction cost, and reduced cost

Inactive Publication Date: 2016-08-24
河南金渠银通金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although this prior art perfectly controls the morphology of the core-shell structure and keeps it in a single crystal state to the greatest extent, it cannot realize the coating of substances with strong reducibility on substances with weak reducibility, because in direct oxidation In the reduction method, replacement reaction is extremely easy to occur, destroying the original structure

Method used

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  • A kind of preparation method of platinum-coated silver core-shell structure nanoparticles
  • A kind of preparation method of platinum-coated silver core-shell structure nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0030] For the reaction vessels and stirring rotors used, they should be mixed with 150g / L NaOH, 80ml / L H 2 o 2 solution for 15 minutes. Fully hydroxylate the surface of the reactor to avoid silver mirrors during the reaction. The cleaned reactor should be washed with deionized water. Step 1: In a 100ml single-necked flask, add 50ml of DEG, in an oil bath at 150°C, stir and heat at high speed for 30min, add 60μl of NaHS solution, react for 4min, add 1.25ml of PVP solution and 500μl of HCl solution, After reacting for 2 minutes, add 0.4ml of silver trifluoroacetate solution, control the temperature at 150°C and stir at high speed, continue the reaction for 60 minutes, then put it into an ice-water bath for rapid cooling, take the product and wash it three times with acetone, and then wash it twice with deionized water. secondly, dispersed in deionized water. The transmission electron microscope picture of the conversion of AgCl to elemental Ag is as follows figure 1 As sho...

Embodiment 2

[0033] For the reaction vessels and stirring rotors used, they should be mixed with 150g / L NaOH, 80ml / L H 2 o 2 solution for 15 minutes. Fully hydroxylate the surface of the reactor to avoid silver mirrors during the reaction. The cleaned reactor should be washed with deionized water. Step 1: In a 100ml single-necked flask, add 50ml of DEG, in an oil bath at 150°C, stir and heat at high speed for 30min, add 60μl of NaHS solution, react for 4min, add 1.25ml of PVP solution and 500μl of HCl solution, After reacting for 2 minutes, add 0.4ml of silver trifluoroacetate solution, control the temperature at 150°C and stir at high speed, continue the reaction for 60 minutes, then put it into an ice-water bath for rapid cooling, take the product and wash it three times with acetone, and then wash it twice with deionized water. secondly, dispersed in deionized water.

[0034] The second step: Take 4ml of the first step product and add it to 16ml of DEG (containing 20mg / ml of PVP), h...

Embodiment 3

[0036] For the reaction vessels and stirring rotors used, they should be mixed with 150g / L NaOH, 80ml / L H 2 o 2solution for 15 minutes. Fully hydroxylate the surface of the reactor to avoid silver mirrors during the reaction. The cleaned reactor should be washed with deionized water. Step 1: In a 100ml single-necked flask, add 50ml of DEG, in an oil bath at 150°C, stir and heat at high speed for 30min, add 60μl of NaHS solution, react for 4min, add 1.25ml of PVP solution and 500μl of HCl solution, After reacting for 2 minutes, add 0.4ml of silver trifluoroacetate solution, control the temperature at 150°C and stir at high speed, continue the reaction for 60 minutes, then put it into an ice-water bath for rapid cooling, take the product and wash it three times with acetone, and then wash it twice with deionized water. secondly, dispersed in deionized water.

[0037] Step 2: Take 6ml of the product from the first step and add it to 14ml of DEG (containing 20mg / ml of PVP), st...

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Abstract

The invention relates to a method for preparing core-shell structure nano-particles with silver coated with platinum. The method comprises the two steps that a layer of the platinum is generated to coat the surface of the silver through a replacement reaction, and a silver crystal nucleus is firstly generated with the help of sodium bisulfide and the common participation and reaction of surface active agents PVP and nucleating agents HCL through reducibility and glutinous flow performance of diethylene glycol; chloroplatinic acid and the surface active agents PVP are mixed in weak reducing agents and the solvent diethylene glycol, the replacement reaction can be evenly generated by platinum ions on the surface of the silver crystal nucleus, and the platinum ions densely coat the surface of the silver. Compared with the prior art, the manufactured structure with the silver coated with the platinum is coated densely and is uniform in particle diameter and large in platinum specific surface area, and the metallic silver and the platinum are fully combined.

Description

technical field [0001] The invention relates to a preparation and method of a nano core-shell structure, in particular to a preparation method of a platinum-coated silver core-shell nano particle. Background technique [0002] Silver powder is the most widely used precious metal powder in the electronics industry. It is used to make conductive adhesives, conductive coatings and various electronic pastes. Platinum is one of the most widely used noble metals in electrocatalysis and has relatively the best catalytic effect. Combining silver and platinum can not only utilize the good electrical conductivity of silver but also maximize the catalytic performance of platinum, and most importantly, greatly reduce the cost of platinum catalysts. The synthesis methods of general core-shell structure include: seed deposition method (including vapor phase deposition, electrodeposition method, chemical water deposition method), hydrothermal method, etc. Both the deposition method and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00
Inventor 胡晓斌延阳
Owner 河南金渠银通金属材料有限公司