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Method for preparing precious metal nanoparticle

A nanoparticle and precious metal technology, which is applied in the field of preparation of precious metal nanoparticles, can solve the problem of low precious metal particles and achieve the effect of easy operation

Inactive Publication Date: 2009-08-05
中国中化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, in addition to adding the stabilizer PVP, an auxiliary stabilizer long-chain amine or water-soluble phosphine needs to be added, and high-pressure and low-temperature equipment are also required.
In addition, since the existing preparation methods are usually carried out under the conditions of extremely dilute noble metal halogen-containing acids and their salts, the concentration of the prepared noble metal particles is extremely low, so before using these nanoparticles, it is necessary to carry out evaporation concentration, repeated washing, Complicated operations such as centrifugation can remove impurities and reach the use concentration

Method used

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  • Method for preparing precious metal nanoparticle
  • Method for preparing precious metal nanoparticle
  • Method for preparing precious metal nanoparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 5.0g of PEG200 in 15.0g of water, add 50mg of chloroplatinic acid, heat up to slightly boiling after dissolving, and continue to react at this temperature for 3 hours. Naturally cooled to room temperature, 10 ml of toluene was added, and the mixture was heated with stirring to raise the temperature of the mixture to 50° C. and maintained for 10 minutes. Then cool the material to room temperature under stirring, let it stand for half an hour, separate the aqueous solution of the lower layer, pour out the toluene of the upper layer, collect the platinum nanoparticles with stabilizer in the middle layer, and the particle size distribution is between 2.0-4.0nm. The TEM image of the obtained platinum nanoparticles is shown in figure 1 .

Embodiment 2

[0025] Dissolve 5.0g of PEG 300 in 15.0g of water, add 50mg of chloroplatinic acid, heat up to slightly boiling after dissolving, and continue to react at this temperature for 3 hours. Naturally cooled to room temperature, 10 ml of benzene was added, and the mixture was heated with stirring to raise the temperature to 40° C. and maintained for 15 minutes. Then cool to room temperature under stirring, let stand for half an hour, separate the lower aqueous solution, pour out the upper benzene, collect the middle layer to obtain platinum nanoparticles with stabilizer, the particle size distribution is between 3.5-4.5nm. The TEM image of the obtained platinum nanoparticles is shown in figure 2 .

Embodiment 3

[0027] Dissolve 5.0g of PEG400 in 15.0g of water, add 50mg of chloroplatinic acid, heat up to slightly boiling after dissolving, and continue to react at this temperature for 3 hours. Naturally cooled to room temperature, 10 ml of toluene was added, and the mixture was heated with stirring to raise the temperature of the mixture to 50° C. and maintained for 10 minutes. Then cool to room temperature under stirring, let stand for half an hour, separate the aqueous solution of the lower layer, pour out the toluene of the upper layer, collect the platinum nanoparticles with stabilizer in the middle layer, and the particle size distribution is between 2.5-3.5nm. The TEM image of the obtained platinum nanoparticles is shown in image 3 .

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Abstract

The invention discloses a method for preparing noble metal nanoparticles, which comprises the following two steps: A, taking polyethylene glycol as a stabilizing agent and reducer, taking halogenous acid of noble metal or halogenide of the noble metal as a metal source, and performing reduction reaction to prepare the noble metal nanoparticles; and B, taking a weak polar or nonpolar solvent as a flocculating agent, and performing flocculation and separation in a reaction liquid to obtain the noble metal nanoparticles. The prepared noble metal nanoparticles by the method have the particle size less than 5nm, and can be placed in a solution for a long time without flocculation.

Description

technical field [0001] The invention relates to a preparation method of noble metal nanoparticles. technical background [0002] Due to the size effect, noble metal nanoparticles have unique applications in optics, electricity and catalytic organic reactions. Add polymer stabilizer such as PVA (polyvinyl alcohol) (L.D.Rampino and F.F.Nord, J.Am.Chem.Soc., 1941, 63, P.2745; 63, P.3268; W.P.Dunworth and F.F.Nord, J. Am.Chem.Soc., 1950, 72, P.4197.), PVP (polyvinylpyrrolidone) (H.Hirai, J.Macromol.Sci.-Chem., 1979, A13(5), P.633), CD (cyclodextrin) (J.Alver, J.Liu, E.Roman and A.E.Kaifer, Chem.Commun., 2000, P.1151) and PNIPAAm (poly N-isopropylacrylamide) (C.-W .Chen and M.Akashi, Langmuir, 1997, 13, P.6465) and reducing noble metal halogen-containing acids and their salts with reducing agents such as sodium borohydride, aldehydes, alcohols, hydrazine, etc. can prepare monodisperse or nearly Monodisperse stable noble metal nanoparticles. Chinese patent CN1215639A discloses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 姜鹏王嫱孙宁宁王芳王春艳龚党生
Owner 中国中化股份有限公司