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A preparation method of surface highly dispersed noble metal high index crystal plane nanoparticles

A high-index crystal face, nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as low dispersion or utilization rate, difficult and unusable particles, etc. achieve good universality

Active Publication Date: 2016-04-13
佛山市志尚盈不锈钢装饰材料有限公司
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  • Application Information

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Problems solved by technology

However, judging from the current preparation method, the obtained samples with high-index noble metal crystal planes are pure noble metal particles with a large size such as 50nm. Although the surface is a high-index crystal plane with special advantages, the overall particle size , most of the noble metal atoms are in the bulk phase and cannot be used, and their dispersion or utilization rate is very low, making these particles difficult to be used in real applications

Method used

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  • A preparation method of surface highly dispersed noble metal high index crystal plane nanoparticles
  • A preparation method of surface highly dispersed noble metal high index crystal plane nanoparticles

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Embodiment 1

[0019] Embodiment 1: the surface layer is the synthesis of the concave surface (high index crystal surface) Ag nano cubic particle of Au crystal surface

[0020] 3 mL of aqueous dispersion containing 7 mg of Ag nanocubic particles was added to 20 mL of 2MKCl solution, followed by 600 mg of PVP and 10 mL of 0.5 mM HAuCl 4 solution, stirred at room temperature for 2 hours and kept it in the dark, after 30 hours, the sample was obtained, and the appearance was as follows: figure 1 TEM pictures show that HAuCl 4 After the introduction, the Ag nano-cubic particles change into Ag nano-cubic particles whose surface layer is Au crystal face (high-index crystal face).

Embodiment 2

[0021] Embodiment two: the surface layer is the synthesis of the concave surface (high index crystal plane) Ag nano cubic particle of Pd crystal plane

[0022] 3 mL of aqueous dispersion containing 7 mg of Ag nanocubic particles was added to 20 mL of 2MKCl solution, followed by 600 mg of PVP and 10 mL of 0.5 mM Na 2 PdCl 4 Solution, after stirring at room temperature for 2 hours, it was left standing in the dark, and after 30 hours, the sample was obtained, and the appearance was as follows: figure 2 TEM photographs show that Na 2 PdCl 4 After the introduction, Ag nanocubic particles change into Ag nanocubic particles with concave surface (high index crystal plane) whose surface layer is Pd crystal plane.

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Abstract

The invention relates to a surface high-dispersion precious metal high-index crystallographic-plane nano-particle preparation method, which comprises the steps of adding copper or silver nano-particles in synthesis system components into KCl solution with concentration of 2M, then adding protective agent PVP (polyvinyl pyrrolidone) and precious metal precursor solution, agitating for 2 hours under normal temperature and standing for 30 hours to obtain samples. The surface high-dispersion precious metal high-index crystallographic-plane nano-particle preparation method has the advantages that since the precious metals are distributed on the surfaces of substrate metal particles, the high dispersity and the high utilization ratio of the precious metals are guaranteed, the high-index crystallographic plane with high dispersity can be constructed through a simpler process at normal temperature for the three kinds of precious metals, the system and the method provided by the invention have better universality and a foundation is laid for the popularization and application of the method.

Description

technical field [0001] The invention relates to a new method for the controllable synthesis of noble metal high-index crystal planes on the surface of relatively cheap metal nanoparticles, especially to make noble metals exist in the form of high-index crystal planes with special properties and at the same time have high dispersion or high Outstanding advantage of utilization. Background technique [0002] Precious metals such as gold, platinum, palladium, etc. are still indispensable or important catalytic materials for many industrial production processes, especially some important multi-phase chemical and chemical processes such as petroleum refining, fine chemical synthesis, hydrogen energy conversion, etc. These important applications Depends on the surface properties of the precious metal material. Studies have shown that the surface of noble metals in the form of high-index crystal planes has special physical and chemical properties that are significantly better than...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02B82Y40/00B82Y30/00
Inventor 赵丹王慧泽邓圣军肖卫明陈超张宁
Owner 佛山市志尚盈不锈钢装饰材料有限公司
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