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Method for producing nanometer metal by plasma deoxidization in low termprature

A low-temperature plasma and nano-metal technology, applied in the field of material science, can solve problems such as uneven distribution of nano-metal particles, easy aggregation of nanoparticles, cumbersome preparation process, etc., and achieve the effects of avoiding adverse thermal effects, good dispersion, and simple operation

Inactive Publication Date: 2007-09-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the preparation process is cumbersome, the operation is complicated, the conditions are harsh, and it is not easy to control, and the above-mentioned reducing agent is harmful to the environment; wherein the gel method needs to be sintered to obtain nanoparticles at the end, and the obtained nanoparticles are easy to obtain. agglomeration, larger particle size
But there are also certain defects, such as long time-consuming, small amount of processed metal, uneven distribution of obtained nano-metal particles

Method used

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  • Method for producing nanometer metal by plasma deoxidization in low termprature
  • Method for producing nanometer metal by plasma deoxidization in low termprature
  • Method for producing nanometer metal by plasma deoxidization in low termprature

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Effect test

Embodiment 1

[0026] Chlorauric acid (HAuCl 4 ) between the two electrode plates of the discharge tube in the vacuum chamber, airtight, evacuate the vacuum chamber, and then fill it with argon as the discharge gas to maintain a pressure of 30Pa, apply a DC voltage of 800V to the electrodes, and use glow discharge Plasma reduction of chloroauric acid (HAuCl 4 ), the reduction time is 100min, and the nano-gold particles are prepared, and the particle diameter is 2.5-7nm.

[0027] The prepared nano-gold particles are analyzed by photoelectron energy spectrum, electron diffraction and transmission electron microscope, and the following analysis results can be obtained:

[0028] As shown in Figure 1, the photoelectron energy spectrogram shows that only the characteristic peaks of gold elements appear in the spectrum, showing that chloroauric acid is reduced to zero-valent gold by the low-temperature plasma method;

[0029] Electron diffraction figure as shown in Figure 2, only has the diffract...

Embodiment 2

[0032] H 2 PtCl 6 Put it between the two electrode plates of the discharge tube in the vacuum chamber, seal it, evacuate the vacuum chamber, then fill it with helium as the discharge gas, maintain the pressure of 50Pa, apply a DC voltage of 200V on the electrode, and use corona discharge plasma reduced H 2 PtCl 6 , the reduction time is 120min, and nano-platinum particles are prepared. It was confirmed by photoelectron spectroscopy, electron diffraction and transmission electron microscopy that H 2 PtCl 6 It is completely reduced to elemental platinum with a particle size of 2.5-10nm.

Embodiment 3

[0034] PdCl 2 Put it between the two electrode plates of the discharge tube in the vacuum chamber, seal it tightly, evacuate the vacuum chamber, then fill it with oxygen as the discharge gas, maintain the pressure of 90Pa, apply an AC voltage of 1000V on the electrodes, and use dielectric barrier discharge plasma Reduced PdCl 2 , the reduction time is 40min, and the nano-lead particles are prepared. PdCl was confirmed by photoelectron spectroscopy, electron diffraction and transmission electron microscopy 2 Completely reduced to elemental lead with a particle size of 3.0-15nm.

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Abstract

The present invention relates to material technology, and is low temperature plasma reduction process for preparing nanometer metal. The production process includes: filling metal salt into vacuum chamber of plasma discharger, vacuumizing the vacuum chamber, introducing plasma discharge gas to pressure of 30-200 Pa, and applying DC or AC voltage of 200-5,000 V with a high voltage power source to discharge the gas and to form plasma reducing the metal salt for 5-120min, so as to prepare nanometer metal particle. The production process has simple equipment, easy operation, low power consumption, great metal treating amount and environment friendship; and the prepared nanometer metal particle has high purity, small size, narrow size distribution, high dispersivity, excellent performance and unique compounding performance with other material, and may find wide application foreground in molecular device, chemical / biological sensor and other fields.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a method for preparing nanometer metal by low-temperature plasma reduction. Background technique [0002] Nanomaterials, also known as ultrafine particle materials, are composed of nanoparticles. Nanoparticles, also called ultrafine particles, generally refer to particles with a size between 1 and 100 nm. Nanoparticles have many advantages: small particle size, large specific surface area, and high catalytic efficiency. In addition, their optical, thermal, electrical, magnetic, mechanical, and chemical properties are significantly different from those of bulk solids; Metal particles have a single magnetic domain structure and high coercive force, and can be made into conductive coatings, conductive adhesives, etc. by using the conductivity of nano-metal particles. There are many potential applications of nano-metal particles, such as rocket boosters, microporous gas se...

Claims

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Application Information

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IPC IPC(8): B22F9/16
Inventor 刘昌俊王召张月萍
Owner TIANJIN UNIV
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