Preparation method of metal icosahedral nanoparticles

An icosahedron and nanoparticle technology, which is applied in the field of preparation of metal nanomaterials, can solve the problems of poor reproducibility of the preparation process, complicated preparation process, not conforming to green chemistry, etc., and achieves reduced preparation cost, high yield, easy effect of operation

An icosahedron and nanoparticle technology, which is applied in the field of preparation of metal nanomaterials, can solve the problems of poor reproducibility of the preparation process, complicated preparation process, not conforming to green chemistry, etc., and achieves reduced preparation cost, high yield, easy effect of operation

CN102019432AInactive Publication Date: 2011-04-20ANHUI NORMAL UNIV
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  • Preparation method of metal icosahedral nanoparticles
  • Preparation method of metal icosahedral nanoparticles
  • Preparation method of metal icosahedral nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Measure 10mL of 0.02mol / L silver nitrate aqueous solution, add 0.1g of polyvinylpyrrolidone, and stir well. Measure 5 mL of 2% (weight concentration) ammonia water, add to the above solution, and stir for 15 minutes. Then the above mixed solution was transferred to a 25mL polytetrafluoroethylene-lined stainless steel reaction kettle and sealed. React in an oven at 120° C. for 10 hours. Cool at room temperature, centrifuge, collect the precipitate, and wash twice with distilled water and absolute ethanol respectively to obtain silver icosahedral nanoparticles with a particle size of 60-80nm.

Embodiment 2

[0019] Measure 10mL of 0.025mol / L silver nitrate aqueous solution, add 0.2g of polyvinylpyrrolidone, and stir well. Measure 5mL of 2% ammonia water, add to the above solution, and stir for 20 minutes. Then the above mixed solution was transferred to a 25mL polytetrafluoroethylene-lined stainless steel reaction kettle and sealed. React in an oven at 140°C for 6 hours. Cool at room temperature, centrifuge, collect the precipitate, and wash twice with distilled water and absolute ethanol respectively to obtain silver icosahedral nanoparticles with a particle size of 50-70nm.

Embodiment 3

[0021] Measure 10mL of 0.03mol / L silver nitrate aqueous solution, add 0.4g of polyvinylpyrrolidone, and stir well. Measure 8 mL of 2% ammonia water, add to the above solution, and stir for 15 minutes. Then the above mixed solution was transferred to a 25mL polytetrafluoroethylene-lined stainless steel reaction kettle and sealed. React in an oven at 120°C for 7 hours. Cool at room temperature, centrifuge, collect the precipitate, and wash twice with distilled water and absolute ethanol respectively to obtain silver icosahedral nanoparticles with a particle size of 40-60nm.

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Abstract

The invention discloses a preparation method of metal icosahedral nanoparticles. The preparation method is as follows: at room temperature, adding polyvinylpyrrolidone into noble metal precursor aqueous solution; stirring uniformly, then adding ammonia water, and stirring for 10-30 minutes at room temperature; transferring the prepared reaction solution into a reactor, sealing and reacting for 2-10 hours at the temperature of 100-200 DEG C; after cooling, centrifuging products, collecting precipitates, and cleaning for 2-3 times by deionized water and absolute ethyl alcohol to obtain the metal icosahedral nanoparticles. Compared with the prior art, in the invention, the polyvinylpyrrolidone is used as both a surface active agent and a reducing agent, the preparation cost is obviously reduced, and water which is low in cost and easy to obtain is used as a solvent and a reaction medium, thus the synthetic method is simple and environment-friendly, is finished by one step, is easy to operate and has strong reproducibility; and the prepared product has the characteristics of high yield, high purity, uniform size distribution and the like, has excellent catalytic activity and can be used for heterogeneous organic reaction catalysis, electric catalysis, electrode materials of fuel batteries and the like.

Description

Technical field: [0001] The invention belongs to the technical field of preparation methods of metal nanomaterials. technical background: [0002] The metal in the present invention refers to precious metals such as gold, silver, platinum, palladium, etc., and its nanomaterials have many excellent properties, and have important application prospects in the fields of optics, catalysis, and sensing, so they have received extensive attention. However, these unique properties are closely related to the size and shape of the material. In particular, noble metal nanoparticles with polyhedral structures usually exhibit better performance than the same materials with other shapes, and have greater advantages in the above fields. Among them, icosahedral noble metal nanoparticles have attracted more attention because of their high symmetry, thus exhibiting unique optical properties and excellent catalytic performance. Usually, noble metal nanoparticles with polyhedral structure are p...

Claims

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Application Information

Patent Timeline
20 Apr 2011
Publication
CN102019432A
IPC
B22F9/24; B82Y40/00
Inventors
耿保友; 蒯龙