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Synthesis method of noble metal nano particles

A technology of nanoparticles and a synthesis method, which is applied in the field of preparation of precious metal nanoparticles, can solve the problems of difficulty in preparing nanoparticles and weak protection of nanoparticles, and achieves the effects of simple and fast preparation process, environmental protection and pollution reduction.

Inactive Publication Date: 2012-03-28
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only polyvinylpyrrolidone is used as a protective agent, and it is difficult to prepare nanoparticles with small particle sizes due to its weak protection for nanoparticles.

Method used

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  • Synthesis method of noble metal nano particles
  • Synthesis method of noble metal nano particles
  • Synthesis method of noble metal nano particles

Examples

Experimental program
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Effect test

Embodiment 1

[0047] At room temperature, take 1ml of RuCl with a concentration of 10mg / ml 3 The ethanol solution was added to a 50ml beaker, 70mgPVP and 10ml ethanol were added, stirred and mixed evenly. 0.1ml of 6M fresh NaBH 4 The aqueous solution was quickly injected into the above-mentioned mixed solution for reaction, and 0.05ml of n-dodecanethiol was added after 1 minute, and the stirring was continued for 15 minutes, and flocculent precipitates gradually appeared. Add an appropriate amount of ethanol to wash to remove residual PVP and dodecanethiol, and centrifuge and dry to obtain Ru nanoparticles with an average particle size of 2nm ( figure 1 ).

Embodiment 2

[0049] At room temperature, take 1ml of RhCl with a concentration of 10mg / ml 3 Add 100mg of PVP and 10ml of ethanol to a 50ml beaker, stir and mix evenly. 0.15ml of 5M fresh NaBH 4 The aqueous solution was quickly injected into the above mixed solution for reaction, and 0.06ml of n-dodecanethiol was added after 1 minute, and the stirring was continued for 15 minutes, and flocculent precipitation gradually appeared. Add an appropriate amount of ethanol to wash to remove residual PVP and dodecanethiol, and centrifugally dry to obtain Rh nanoparticles with an average particle diameter of 2nm ( figure 2 ).

Embodiment 3

[0051] At room temperature, take 1ml of PdCl with a concentration of 10mg / ml 2 Add 120mg of PVP and 12ml of ethanol to a 50ml beaker, stir and mix evenly to obtain a transparent solution. 0.1ml of 6M fresh NaBH 4 The aqueous solution was quickly injected into the above-mentioned mixed solution for reaction, and 0.05ml of n-dodecanethiol was added after 1 minute, and the stirring was continued for 15 minutes, and flocculent precipitates gradually appeared. Add an appropriate amount of ethanol to wash to remove residual PVP and dodecanethiol, and centrifugally dry to obtain Pd nanoparticles with an average particle size of 3nm ( image 3 ), Figure 4 It shows that the synthesis of nano palladium with good crystallization is obtained.

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Abstract

The invention discloses a synthesis method of noble metal nano particles, which comprises the following steps: dissolving soluble noble metal salt and surfactant polyvinyl pyrrolidone in ethanol at room temperature, wherein the mass ratio of the noble metal salt to the polyvinyl pyrrolidone is (1:5)-(1:20); adding a reductive amount of NaBH4, and then adding n-dodecanethiol; and carrying out centrifugal separation, precipitating, and washing to obtain the noble metal nano particles. By using ethanol as the solvent, the invention is safe, environment-friendly, green and non-poisonous, thereby reducing the environmental pollution and the harm to a human body, and being beneficial to environmental protection; the synthesis process is completed at room temperature without any heating step, thereby saving the energy and ensuring that the whole preparation process is very simple and convenient; and no special equipment is required, and the process is high in repeatability, thereby being beneficial to realizing large-scale production.

Description

technical field [0001] The invention relates to a method for preparing noble metal nanoparticles, which belongs to the technical field of noble metal nanoparticles preparation. Background technique [0002] Due to their good catalytic, optical and other physical and chemical properties, noble metal nanoparticles have attracted extensive attention from many researchers in the industry and scientific research circles in recent years, and have been widely used in fuel cells, chemical catalysis and other fields. The properties of nanomaterials are greatly affected by their size. When the size decreases, the specific surface area increases. When the particle size drops to 1nm, the percentage of surface atoms increases sharply, and the proportion of surface atoms reaches more than 80%. Almost all atoms are concentrated in The surface of nanoparticles has high catalytic activity. [0003] So far, scientists have explored a variety of preparation methods of monodisperse noble metal...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00B82Y30/00
Inventor 张磊王训谢钢
Owner NORTHWEST UNIV
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