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Method for preparing gold-platinum core-shell nanostructural material

A nanostructure and gold preparation technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of precise control of Pt deposition position without complex structure gold nanoparticles and other issues to achieve the effects of high-efficiency catalytic performance, simple process, good catalytic performance and SERS performance

Inactive Publication Date: 2018-12-04
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to provide a method for preparing gold-platinum core-shell nanostructure materials, which solves the problem of preparing gold-platinum core-shell nanostructures with a simple process without using gold nanoparticles with complex structures as templates and precisely regulating the deposition position of Pt. Material Method Questions

Method used

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  • Method for preparing gold-platinum core-shell nanostructural material
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  • Method for preparing gold-platinum core-shell nanostructural material

Examples

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Embodiment 1

[0019] Based on temperature control, the in-situ reduction on the surface of hexahedral gold nanoparticles and the precise deposition of Pt on the sharp corners form a gold-platinum core-shell nanostructure covered with Pt on the sharp corners. The following steps are adopted:

[0020] (1) Dilute 1 mL of hexahedral gold nanoparticle colloid into 3.5 mL of water, then add 500 μL of 200 mM CTAC aqueous solution, 10 μL of 2 mM AgNO 3 aqueous solution and 40 μL of 100 mM ascorbic acid solution, the mixture was magnetically stirred for 1.5 h at a stirring speed of 600 rpm. The whole reaction was carried out at 20°C, where mM is the abbreviation of mmol / L.

[0021] (2) Add 60μL of 10mM H 2 PtCl 6 Add the aqueous solution to step (1), maintain the reaction temperature at 20°C and continue stirring for 2h;

[0022] (3) Centrifuge and purify the product of step 2) for 3 times, the centrifugal speed is 1400, and the centrifugation time is 10 min. After purification, the precipitate ...

Embodiment 2

[0024] Based on temperature control, in situ reduction on the surface of hexahedral gold nanoparticles and precise deposition of Pt on the edges to form a gold-platinum core-shell nanostructure covered with Pt on the edges, the following steps are adopted:

[0025] (1) Dilute 1 mL of hexahedral gold nanoparticle colloid into 3.5 mL of water, then add 500 μL of 200 mM CTAC aqueous solution, 10 μL of 2 mM AgNO 3 aqueous solution and 40 μL of 100 mM ascorbic acid solution, and the mixture was magnetically stirred for 2 hours at a stirring speed of 400 rpm. The entire reaction was carried out at 25°C.

[0026] (2) Add 60μL of 10mM H 2 PtCl 6 Add the aqueous solution to step (1), maintain the reaction temperature at 25°C and continue stirring for 2h;

[0027] (3) The product of step 2) was centrifuged and purified 3 times, the centrifugal speed was 1600 rpm, and the centrifugation time was 5 min. After purification, the precipitate was redispersed in 1 mL of water, and the prod...

Embodiment 3

[0029] Based on temperature control, in situ reduction on the surface of hexahedral gold nanoparticles and precise deposition of Pt on the surface to form a gold-platinum core-shell nanostructure covered with Pt and rough on the surface, the following steps are adopted:

[0030] (1) Dilute 1 mL of hexahedral gold nanoparticle colloid into 3.5 mL of water, then add 500 μL of 200 mM CTAC aqueous solution, 10 μL of 2 mM AgNO 3 aqueous solution and 40 μL of 100 mM ascorbic acid solution, the mixture was magnetically stirred for 1.5 h at a stirring speed of 600 rpm. The entire reaction was carried out at 35°C.

[0031] (2) Add 60μL of 10mM H 2 PtCl 6 Add the aqueous solution to step (1), maintain the reaction temperature at 35°C and continue stirring for 2h;

[0032] (3) The product of step 2) was centrifuged and purified 3 times, the centrifugal speed was 1600 rpm, and the centrifugation time was 5 min. After purification, the precipitate was redispersed in 1mL of water, and t...

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Abstract

The invention discloses a method for preparing a gold-platinum core-shell nanostructural material. The method comprises the following steps: with gold nanoparticles as a template, fully mixing a goldnanoparticle colloid with silver nitrate, dodecyltrimethylammonium chloride and an ascorbic acid aqueous solution, then adding a chloroplatinic acid aqueous solution into the mixed solution, allowingPt atoms to reduce and deposit in situ on the surface of the gold nanoparticles, and adjusting and controlling a reaction temperature to realize precise deposition adjustment and control of platinum at different positions of the surface of a gold nanomaterial so as to prepare a gold-platinum core-shell nanostructure with different Pt coverings. The method provided by the invention utilizes nanometer gold with complex structure and high crystal face structure as the template to prepare hexoctahedron gold-platinum core-shell nanoparticles with highly-efficient catalytic performance, has simple process, and prepares Au@Pt nanoparticles with good catalytic performance and SERS performance.

Description

technical field [0001] The invention relates to the preparation of nanomaterials, in particular to a method for preparing gold-platinum core-shell nanostructure materials. Background technique [0002] A large number of experimental and theoretical studies in recent years have shown that the morphological and structural features of Pt-based bimetallic nanoparticles affect their properties. Bimetallics of complex Pt with high crystal facets have high catalytic performance, and some researchers have found that icosahedral Pt 3 ORR ratio of N catalyst to face-centered cubic Pt 3 The area ratio of the Ni catalyst is about 50% higher than the activity. According to the SERS enhancement mechanism, a significantly enhanced electromagnetic field can be obtained at the tips or nanoscale gaps of metal nanomaterials, exhibiting excellent SERS performance at these "hot spots". Compared with simple gold nanostructures such as spheres and rods, nanocrystals with complex structures and ...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/02
CPCB01J23/52B01J35/396B01J35/50
Inventor 宋春元汪联辉孙友志梁东王一卓
Owner NANJING UNIV OF POSTS & TELECOMM
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