Gold nucleus and silver shell double-metal nanocrystal and preparation method thereof

A bimetallic nano-silver shell technology, applied in nanostructure manufacturing, crystal growth, nanotechnology, etc., can solve problems such as synthesis methods to be studied

Inactive Publication Date: 2011-06-15
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shape-controllable synthesis of gold-core/silver-shell

Method used

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  • Gold nucleus and silver shell double-metal nanocrystal and preparation method thereof
  • Gold nucleus and silver shell double-metal nanocrystal and preparation method thereof
  • Gold nucleus and silver shell double-metal nanocrystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In this example, gold / silver core-shell structures with different shapes are prepared by using 1,5-pentanediol (PD) as a solvent and reducing agent. The shape of the gold core and silver shell bimetallic nanocrystals prepared in this example is The bimetallic nanocrystal has a regular crystal shape, a gold core and a silver shell bimetallic nanocrystal based on the {100} plane, and the crystal shape includes a cube (see attached Figure 3a with 3b ), bicubic triangle (see attached Figure 3c with 3d ) and rod-like structures with five-twinned cross-sections and {100}-type crystal planes on the sides (see attached Figure 3e )Wait.

[0055] The specific preparation method of the gold-core and silver-shell bimetallic nanocrystals of this embodiment comprises the following steps:

[0056] 1) 0.05M chloroauric acid (HAuCl 4 ·3H 2 O) 3 milliliters (mL) of 1,5-pentanediol (PD) solution and 3 milliliters (mL) of 0.15M polyvinylpyrrolidone (PVP) 1,5-pentanediol (PD) solut...

Embodiment 2

[0061] In this example, gold / silver core-shell structures with different shapes were prepared by using 1,4-butanediol as a solvent and reducing agent. These shapes include cubes (attached Figure 3a with 3b ), cubic double triangle (attached Figure 3c with 3d ) and a rod-like structure with a fivefold twinned cross-section and {100}-type crystal planes on the sides (attached Figure 3e )Wait.

[0062] Concrete preparation method comprises the following steps:

[0063] 1) 0.05M chloroauric acid (HAuCl 4 ·3H 2 O) 10 milliliters (mL) of 1,4-butanediol solution and 10 milliliters (mL) of 0.15M polyvinylpyrrolidone (PVP) 1,4-butanediol solution are fully mixed with each other, then, 0.1mM silver nitrate 10 milliliters (mL) of the 1,4-butanediol solution was dripped into the above-mentioned mixed solution to obtain the reactant mixed solution 1;

[0064] 2) Prepare 0.9M PVP and 0.3M silver nitrate (AgNO 3 ) of 1,4-butanediol solution 30ml to obtain reactant mixed solution ...

Embodiment 3

[0068] In this example, gold / silver core-shell structures with different shapes were prepared by using ethylene glycol (EG) as a solvent and reducing agent. These shapes include cubes (attached Figure 3a with 3b ), cubic double triangle (attached Figure 3c with 3d ) and a rod-like structure with a fivefold twinned cross-section and {100}-type crystal planes on the sides (attached Figure 3e )Wait.

[0069] Concrete preparation method comprises the following steps:

[0070] 1) 0.05M chloroauric acid (HAuCl 4 ·3H 2 O) 20 milliliters (mL) of ethylene glycol (EG) solution and 20 milliliters (mL) of 0.15M polyvinylpyrrolidone (PVP) ethylene glycol (EG) solution are fully mixed with each other, then, 0.1mM silver nitrate in ethylene glycol 20 milliliters (mL) of diol (EG) solution was dripped into the above mixed solution to obtain reactant mixed solution 1;

[0071]2) Prepare 0.9M PVP and 0.3M silver nitrate (AgNO 3 ) of ethylene glycol (EG) solution 60ml to obtain react...

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Abstract

The invention relates to a gold nucleus and silver shell double-metal nanocrystal and a preparation method thereof. The crystal is in a rod-shaped structure with a regular crystalline form, wherein the rod-shaped structure is focused on a {100} surface and comprises a double-cube triangle, a cube and a five-twin crystal section, and simultaneously the side surface of the rod-shaped structure is a {100} type crystal surface. The preparation method comprises the following steps of: heating a polyhydroxy-alcohol solution containing chloroauric acid, polyvinylpyrrolidone and silver nitrate, cooling at a room temperature and carrying out centrifugal precipitation to obtain a gold crystal seed; and adding the gold crystal seed obtained by centrifugal separation to a polyhydroxy-alcohol solution containing the polyvinylpyrrolidone, adding the silver nitrate in a molar ratio [AgNO3]/[HuAuCl4], heating by using an oil bath to obtain a product solution, and then carrying out centrifugation to obtain a product. In the first step of reaction in the preparation method, a certain trace of silver nitrate is added to the solution so that the shape of a gold nucleus is effectively controlled, the crystal with a regular crystalline form is obtained, and the shape of a silver shell is finally decided on the shape of the gold seed. The preparation method realizes rapid and batch controllable preparation of a silver-coated gold nano nucleus/silver structure crystal forced on the {100} surface.

Description

technical field [0001] The invention relates to a nanocrystal with a core-shell structure and a preparation method, in particular to a shape-controllable nanocrystal with a gold-core-silver-shell structure mainly composed of {100} type crystal planes and a preparation method for the nanocrystal. Background technique [0002] Different from single-component metal nanoparticles, bimetallic nanoparticles have attracted much attention of researchers because of their unique optical, electrical, catalytic and magnetic properties. Because the above properties mainly depend on the composition, size and shape of nanoparticles, the controllable preparation of bimetallic nanoparticles with different structures and compositions has become a research hotspot. Bimetallic nanocrystals with a core / shell structure are a typical example. The precious metals gold (Au) and silver (Ag) have the same face-centered cubic crystal structure, and their lattice constants (Au (0.408nm), Ag (0.409nm)) ...

Claims

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Application Information

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IPC IPC(8): C30B29/60B22F9/24B82B3/00
Inventor 吴雁江鹏
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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