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Preparation method for metal-metal oxide nanocomposite

A technology of nanocomposite materials and oxides, which is applied in the field of preparation of metal-metal oxide nanocomposite materials, can solve the problems of polluted environment, complex process and long cycle.

Active Publication Date: 2018-05-15
PEKING UNIV
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Problems solved by technology

However, the process of the above-mentioned preparation method is complicated, the cycle is long, and a large amount of waste liquid will be produced, which will pollute the environment. For example, the high-temperature liquid phase reduction method needs to prepare a cobalt salt solution containing a surfactant, and at high temperature, add a reducing agent, Co nanocrystals Slow nucleation and growth to obtain Co nanoparticles, and then separate Co nanoparticles for surface oxidation

Method used

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  • Preparation method for metal-metal oxide nanocomposite

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[0029] The invention provides a preparation method of a metal-metal oxide nanocomposite material, comprising the following steps:

[0030] (1) providing a conductive substrate attached with a metal oxide film;

[0031] (2) electron beam irradiation is performed on the metal oxide film on the conductive substrate to obtain metal nanoparticles;

[0032] (3) placing the metal nanoparticles in an oxygen-containing atmosphere, and performing an oxidation reaction to obtain a metal-metal oxide nanocomposite material.

[0033] The present invention first provides a conductive substrate to which a metal oxide thin film is attached.

[0034] In the present invention, the metal oxide thin film is preferably an oxide thin film of Ti, Cr, Mn, Fe, Cu, Co or Ni.

[0035] In the present invention, the metal oxide film is preferably a film with atomic level flatness, the flatness of the metal oxide film is represented by root mean square RMS, and the RMS is preferably 0.1-0.2 nm; the metal ...

Embodiment 1

[0054] (1) A CoO film with a thickness of 18 nm was deposited on a Si(111) substrate by a pulsed laser deposition method; the laser frequency of the pulsed laser deposition method was 5 Hz, and the energy density was 2 J / cm 2 , the target material used is a Co target material with a purity of 99.99%, rotating at a speed of 20deg / s, the deposition atmosphere is an oxygen atmosphere, and the pressure is 2.3×10 -4 Torr, the deposition temperature is room temperature, and the total pulse is 1500p; the obtained CoO film is an atomically flat film;

[0055] (2) Electron beam irradiation is performed on the CoO thin film to obtain metallic Co nanoparticles; the electron irradiation dose of the electron beam irradiation is 6×10 19 / cm 2 , the control acceleration voltage is 17kV, the beam intensity is 2mA, the irradiation temperature is 449~451℃, and the irradiation time is 5min; the size of the conductive substrate is 0.5×0.5mm;

[0056] (3) The metallic Co nanoparticles are placed...

Embodiment 2

[0059] Co-CoO nanocomposites were prepared according to the method described in Example 1, and the electron irradiation dose was increased to 1.8×10 20 / cm 2 , the irradiation time is 15min.

[0060] The resulting composites were characterized using atomic force microscopy, as figure 1 As shown in (b), the average particle size of the obtained composite material was measured to be 30 nm.

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Abstract

The invention provides a preparation method for a metal-metal oxide nanocomposite. A conducting substrate where a metal oxide thin film is attached to is provided at first; the metal oxide thin film is subjected to electron beam irradiation, and metal nanoparticles are obtained; and the metal nanoparticles are placed in an oxygen-containing atmosphere for oxidation reaction, and the metal-metal oxide nanocomposite is obtained. The method provided by the invention adopts electron beam irradiation, operation is simple, the technique period is short, a preparation technique of the metal-metal oxide nanocomposite is greatly simplified, in addition, chemicals such as solvents do not need to be used in the whole preparation process, and no environment pollution is caused.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a preparation method of a metal-metal oxide nanocomposite material. Background technique [0002] Nanomaterials have the characteristics of small particle size and large specific surface area. Compared with bulk materials, nanomaterials often show better physical and chemical properties and have a wider range of applications. Among nanomaterials, metal-metal oxide nanocomposites are widely used in catalysis, metallurgy, capacitors, batteries and other fields, and the performance requirements of metal-metal oxide nanocomposites in each field are different. [0003] At present, the preparation methods of metal-metal oxide nanocomposites mainly include high temperature liquid phase reduction method, chemical vapor deposition, metal particle surface oxidation method, and metal oxide surface reduction method. However, the process of the above preparation method is complicated, the cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/20B82B3/00B82Y40/00B82Y30/00
CPCB82B3/00B82Y30/00B82Y40/00B22F9/20B22F1/07B22F1/145
Inventor 杨金波丁石磊韩立薛明珠许壮孔祥东
Owner PEKING UNIV
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