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Preparation method of hollow noble metal nanoparticles

A hollow structure, precious metal technology is applied in the field of preparation of hollow structure metal particles, which can solve the problems of high preparation cost, complicated operation process, complicated process control, etc., and achieve the effects of simple operation, high application value and low cost.

Inactive Publication Date: 2010-04-07
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But so far, the preparation and synthesis of noble metal nanoparticles with hollow structure is limited to the replacement reaction method, but the replacement reaction generally requires the use of expensive metals, such as silver, as a template, resulting in high preparation costs and complicated operation. The control is complex, which greatly limits its application in catalysis and other fields

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  • Preparation method of hollow noble metal nanoparticles
  • Preparation method of hollow noble metal nanoparticles
  • Preparation method of hollow noble metal nanoparticles

Examples

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Embodiment 1

[0014] Example 1: First, take cuprous oxide particles with a particle size of 100nm and add them to a cetyltrimethylammonium bromide solution with a concentration of 20mg / mL to make cetyltrimethylammonium bromide and oxidation The mass ratio of cuprous is 1:1, and the H concentration of 10mg / mL is added to this mixed solution 2 PtCl 6 The solution was mixed and stirred well for 4 hours, wherein the added H 2 PtCl 6 The mass ratio of Pt ions to cuprous oxide in the solution is 2:1; finally, the reacted mixture is centrifuged, and the obtained solid precipitate is washed with ammonia water, and after centrifugation, the following Figure 1a , Figure 1b Shown are hollow Pt nanometal particles with an average particle size of around 100 nm.

Embodiment 2

[0015] Embodiment 2: First, take cuprous oxide particles with a particle size of 50nm and add them to a cetyltrimethylammonium bromide solution with a concentration of 40mg / mL to make cetyltrimethylammonium bromide and oxidation The mass ratio of cuprous is 1:1, and the K concentration of 60mg / mL is added to this mixed solution. 2 PtCl 6 ·6H 2 O solution was mixed and stirred well for 4 hours, to which the K 2 PtCl 6 ·6H 2 The mass ratio of Pt ion to cuprous oxide in the O solution is 4:1; finally, the reacted mixture is centrifuged, and the obtained solid precipitate is washed with ammonia water, and after centrifugation, an average particle size of 50nm can be obtained. Left and right hollow Pt nanoparticles.

Embodiment 3

[0016] Example 3: First, take cuprous oxide particles with a particle size of 500nm and add them to a cetyltrimethylammonium bromide solution with a concentration of 10mg / mL to make cetyltrimethylammonium bromide and oxidation The mass ratio of cuprous is 1:1, and the H concentration of 1 mg / mL is added to the mixed solution 2 PdCl 4 The solution was mixed and stirred well for 4 hours, wherein the added H 2 PdCl 4 The mass ratio of Pd ion and cuprous oxide in the solution is 1: 1; Finally, the mixture after the reaction is centrifuged, and the obtained solid precipitate is washed with ammonia water, and after centrifugation, the following Figure 2a , Figure 2b Hollow Pd nanoparticles with an average particle size of about 500nm.

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Abstract

The invention relates to a preparation method of hollow noble metal nanoparticles. The method comprises the following steps: adding cuprous oxide nanoparticles in cetyl trimethyl ammonium bromide (CTAB) aqueous solution, adding the aqueous solution of soluble salt or acid of Pt, Pd or Au in the mixed solution, then fully mixing the mixed solution to react completely; finally performing centrifugal separation to the obtained mixture after the reaction to obtain solid precipitate, washing the solid precipitate with aqueous ammonia and centrifuging to obtain precipitate, namely the hollow noble metal nanoparticles. The whole preparation process has simple operation and easy technology, and the preparation method can be used for the preparation of different kinds of hollow noble metal nanoparticles and for realizing the mass production of hollow noble metal nanoparticles. The method is convenient to operate, the cost is cheap, the diameter of the obtained hollow nanoparticles can be adjusted by changing the diameter of cuprous oxide particles, the wall thickness of hollow nanoparticles is less than 10nm, and the hollow nanoparticles have large specific surface, thus the hollow nanoparticles have tremendous application value in catalysis and other fields.

Description

technical field [0001] The invention relates to a preparation method of hollow structure metal particles, in particular to a preparation method of hollow structure nano noble metal particles. technical background [0002] The noble metal Pt, Pd, and Au nanoparticles with hollow structure have attracted great attention in the field of energy catalysis because of their high specific surface area and surface catalytic activity. Especially in terms of fuel cell catalysis, hollow nanoparticles have shown many advantages, such as higher surface activity, longer catalytic life, lower cost and so on. [0003] But so far, the preparation and synthesis of noble metal nanoparticles with hollow structure is limited to the replacement reaction method, but the replacement reaction generally requires the use of expensive metals, such as silver, as a template, resulting in high preparation costs and complicated operation. The control is complex, thus greatly limiting its application in cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 杨生春杨志懋丁秉钧宋晓平
Owner XI AN JIAOTONG UNIV
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