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Nanocrystal with core-shell structure and preparation method thereof

A technology of nano-crystal and core-shell structure, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve problems such as the inability to control crystal shape and crystal plane, and achieve the effect of clear crystal shape

Inactive Publication Date: 2011-05-11
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the bimetallic nanocrystals obtained by the existing preparation methods are usually spherical and rod-shaped crystals, and the control of the crystal shape and crystal plane cannot be achieved by the existing preparation methods

Method used

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  • Nanocrystal with core-shell structure and preparation method thereof
  • Nanocrystal with core-shell structure and preparation method thereof
  • Nanocrystal with core-shell structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] In this example, various shapes of gold-core-silver-shell structures with thinner silver shells were prepared. These shapes include triangles (attached Figure 2a ), hexagon (with Figure 2b ), Pentagram (attached Figure 2c ), octahedral shape (attached Figure 2d )Wait.

[0064] Concrete preparation method comprises the following steps:

[0065] 1) Get the ethylene glycol solution of 20ml of 0.1M chloroauric acid and 20ml of 1M polyvinylpyrrolidone, and fully mix each other according to the molar ratio of [chloroauric acid] / [polyvinylpyrrolidone] 1 / 10 to obtain the reactant mixed solution 1 ;

[0066] 2) Take 20ml of 0.1M AgNO 3 And 20ml of 1M polyvinylpyrrolidone nitrogen-dimethylformamide solution, according to [AgNO 3 ] / [polyvinylpyrrolidone] molar ratio 1 / 10, [AgNO 3 ] / [AuCl] molar ratio 1 is fully mixed with each other to obtain a reactant mixed solution 2;

[0067] 3) The mixed solution 1 is transferred into a microwave reactor, and after the microwave ...

Embodiment 2

[0070] In this example, various shapes of gold / silver core-shell nanocrystal structures with thicker silver shells were prepared. The cross-sectional shapes of these crystal structures include triangles (attached Figure 3a ), hexagon (with Figure 3b ), Pentagram (attached Figure 3c ). The crystal also has an octahedral shape (attached Figure 3d )Wait. Concrete preparation method comprises the following steps:

[0071] 1) Get the ethylene glycol solution of 20ml of 0.1M chloroauric acid and 20ml of 1M polyvinylpyrrolidone, and fully mix each other according to the molar ratio of [chloroauric acid] / [polyvinylpyrrolidone] 1 / 10 to obtain the reactant mixed solution 1 ;

[0072] 2) Take 20ml of 0.9MAgNO 3 and 20ml of 9M polyvinylpyrrolidone nitrogen, nitrogen-dimethylformamide solution, according to [AgNO 3 ] / [polyvinylpyrrolidone] molar ratio 1 / 10, [AgNO 3 ] / [auric acid chloride] in a molar ratio of 9 is fully mixed with each other to obtain a reactant mixed solution ...

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Abstract

The invention provides a method for preparing a nanocrystal with a core-shell structure. The method comprises the following steps of: (1) mixing a glycol solution containing Au ions and a glycol solution of polyvinylpyrrolidone, heating the mixed solution by microwave radiation, adding ethanol after the solution is cooled, and centrifuging to obtain a gold crystal seed precipitate; and (2) mixing N,N-dimethyl formamide containing Ag ions and N,N-dimethyl formamide of polyvinylpyrrolidone, adding the gold crystal seed precipitate into the mixed solution, heating till boiled, centrifuging to collect precipitate, and cleaning. The invention also provides the nanocrystal prepared with the method. The equipment and the process of the preparation method are simple, safe and universal and have strong operability; and scale production can be realized. Therefore, under the conventional experimental condition, the crystal with a regular crystalline form and a gold-core silver-shell nano-structure can be synthesized in high yield.

Description

technical field [0001] The present invention relates to a nanocrystal with a core-shell structure and a preparation method and application of the nanocrystal, in particular to a shape-controllable nanocrystal with a gold-core-silver-shell structure mainly composed of {111} type crystal planes and the nanocrystal. Preparation methods of nanocrystals. Background technique [0002] Compared with single-component metal nanoparticles, bimetallic nanoparticles have attracted the attention of researchers because of their unique optical, electrical, catalytic and magnetic properties. Since the above properties mainly depend on the composition, size, and shape of nanoparticles, the controllable synthesis of bimetallic nanocrystals with core / shell structure has become a research hotspot. Many methods have been developed for the synthesis of bimetallic nanoparticles. For example, ethanol-citrate reduction method (Link, S.; Wang, Z.L.; El-Sayed, M.A.J. Phys. Chem.B 1999, 103, 3529), t...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C30B30/00C30B29/02
Inventor 江鹏
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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