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Au@AuPt alloy nanoparticles and preparation method of colloidal dispersion system

A technology of alloy nanoparticles and colloidal dispersion, applied in the field of nanometers, to achieve the effects of easy control of product composition, simple preparation process, and easy mass production

Inactive Publication Date: 2014-02-26
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the core-shell structure AuAuPt alloy nanoparticles and their colloids have not been reported so far

Method used

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  • Au@AuPt alloy nanoparticles and preparation method of colloidal dispersion system
  • Au@AuPt alloy nanoparticles and preparation method of colloidal dispersion system
  • Au@AuPt alloy nanoparticles and preparation method of colloidal dispersion system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Prepare HAuCl with a concentration of 0.162mol / L 4 and H 2 PtCl 6 aqueous solution.

[0031] (2) Add 125 μL of HAuCl prepared in step (1) to a 50ml round bottom flask successively 4 aqueous solution, 125 μL H 2 PtCl 6 Aqueous solution, 0.75g sodium diisooctyl sulfonate succinate, 5ml cyclohexane, mixed uniformly to obtain system A.

[0032] (3) Add 500 μL of ascorbic acid aqueous solution with a concentration of 150 g / L to System A under magnetic stirring at room temperature, and the solution gradually turns purple. Continue magnetic stirring for 30 minutes; then add 100 μL of 80% hydrazine hydrate solution, the solution gradually turns brown, react for 30 minutes, and the experiment stops.

[0033] (4) Transfer the reaction system obtained in step (3) to a 50ml centrifuge tube, add 40ml of ethanol, stir well and carry out centrifugal sedimentation, discard the supernatant to get the precipitate, and wash the precipitate repeatedly with absolute ethanol to obt...

Embodiment 2

[0037] (1) Prepare HAuCl with a concentration of 0.162mol / L 4 and H 2 PtCl 6 aqueous solution.

[0038] (2) Add 100 μL of HAuCl prepared in step (1) to a 50ml round bottom flask sequentially 4 aqueous solution, 100 μL H 2 PtCl 6 Aqueous solution, 0.5g sodium dioctyl succinate sulfonate, 5ml cyclohexane, mixed uniformly to obtain system A.

[0039] (3) Add 300 μL of ascorbic acid aqueous solution with a concentration of 100 g / L to System A under magnetic stirring at room temperature, and the solution gradually turns purple. Continue magnetic stirring for 30 minutes; then add 20 μL of 80% hydrazine hydrate solution, the solution gradually turns brown, react for 30 minutes, and the experiment stops.

[0040] (4) Transfer the reaction system obtained in step (3) to a 50ml centrifuge tube, add 40ml of ethanol, stir well and carry out centrifugal sedimentation, discard the supernatant to get the precipitate, and wash the precipitate repeatedly with absolute ethanol to obtain A...

Embodiment 3

[0043] (1) Prepare NaAuCl with a concentration of 0.162mol / L 4 、Na 2 PtCl 6 aqueous solution.

[0044] (2) Add 125 μL of NaAuCl prepared in step (1) to a 50ml round bottom flask in sequence 4 aqueous solution, 125 μL Na 2 PtCl 6 Aqueous solution, 0.75g sodium dioctyl succinate sulfonate, 5ml n-hexane, mixed uniformly to obtain System A.

[0045] (3) Add 500 μL of ascorbic acid aqueous solution with a concentration of 150 g / L to System A under magnetic stirring at room temperature, and the solution gradually turns purple. Continue magnetic stirring for 30 minutes; add 100 μL of 80% hydrazine hydrate solution, the solution gradually turns brown, react for 30 minutes, and the experiment stops.

[0046] (4) Transfer the reaction system obtained in step (3) to a 50ml centrifuge tube, add 40ml of ethanol, stir well and carry out centrifugal sedimentation, discard the supernatant to get the precipitate, and wash the precipitate repeatedly with absolute ethanol to obtain AuAuPt ...

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Abstract

The invention discloses Au@AuPt alloy nanoparticles and a preparation method of a colloidal dispersion system, and particularly provides nanoparticles having a preparation method and a controllable reaction process and a preparation method of a colloidal dispersion system. The method comprises the following steps: preparing a system A: the system A contains a dispersion reagent, a gold precursor, a platinum precursor and a protective agent, wherein the protective agent is sodium di-n-octyl sulfosuccinate, the gold precursor is HAuCl4, NaAuCl4 or AuCl3, and the platinum precursor is H2PtCl6 or Na2PtCl6; at room temperature, adding a reducer A into the system A while stirring to reduce part of the gold precursor, adding a reducer B, and continuing stirring at room temperature until the reaction is complete, thereby obtaining the core-shell-structure Au@AuPt alloy nanoparticles, wherein the reducer A is ascorbic acid, and the reducer B is a hydrazine hydrate water solution; and adding ethanol or methanol into the reaction system, carrying out centrifugal settling, taking the precipitate, and washing the precipitate to obtain the core-shell-structure Au@AuPt alloy nanoparticle powder. The method has the advantages of simple preparation technique and low energy consumption.

Description

technical field [0001] The invention relates to the field of nanotechnology, in particular to a method for preparing AuAuPt alloy nanoparticles with a core-shell structure and a colloid dispersion system thereof. Background technique [0002] As we all know, noble metals and their alloy nanoparticles exhibit excellent performance and wide application in the fields of low-temperature fuel cells, nano-biosensors, magnetic memory materials and so on. The core-shell structure of noble metals and their alloy nanoparticles can be well regulated and promoted due to the simultaneous existence of structural regulation and electronic regulation. [0003] At present, the preparation of nanoparticles with a core-shell structure generally requires two steps. First, the nanoparticle core is synthesized, and then the nanoshell is wrapped on the surface of the nanoparticle core. For example, in 2012, Rongjuan Feng et al reported in "Colloids and Surfaces A: Physicochemical and Engineering ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 梁新义张博
Owner TIANJIN UNIV OF COMMERCE
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