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Fe3O4/Si nanometer porous array composite material preparation method

A composite material and nanoporous technology, which is applied in the field of preparation of nanocomposite materials, can solve problems such as low porosity, uneven particle size distribution, and low density of silicon nanocrystals, and achieve improved magnetic properties and moisture sensitivity, and process instruments Simple, high crystallite density effect

Inactive Publication Date: 2008-02-13
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0002] The problem of traditional porous silicon is that the porous structure is not uniform, the density of silicon nanocrystals is low, and due to the presence of silicon dangling bonds, it is easily oxidized by oxygen and the surface chemical properties are unstable. Traditional nano-Fe 3 o 4 The particle size distribution is uneven, there is agglomeration, and the porosity is low, which limits its application value as a magnetic material and sensor

Method used

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  • Fe3O4/Si nanometer porous array composite material preparation method

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Embodiment

[0013] (1) Preparation of HF / Fe(NO 3 ) 3 Corrosive solution, HF concentration 7mol / L, Fe(NO 3 ) 3 The concentration is 0.08 mol / L, the filling degree of the hydrothermal kettle is 85%, the reaction temperature is 170° C., and the reaction time is 1 hour, and the Si nanoporous array is prepared, and its scanning electron microscope picture is shown in Fig. 1 .

[0014] (2) Prepare the microemulsion in this ratio: TrintonX-100: n-hexanol: cyclohexane=1: 1: 1 (volume ratio), then add to the mixed solution (NH 4 ) 2 SO 4 ·FeSO 4 ·6H 2 0: In hydrazine hydrate=1:1 (molar ratio), react in a hydrothermal reactor for 1 hour at a temperature of 120°C, and cool naturally after the reaction;

[0015] (3) Utilize the spin coater to control the rotation speed of 1000 rpm to wrap the Fe in the microemulsion 3 o 4 Nanoparticles are sprayed on silicon nanohole arrays;

[0016] (4) Under the protection of 99.9999% nitrogen, perform annealing treatment, the annealing temperature is 200...

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Abstract

The invention discloses a preparation method for Fe3O4 / Si nano porous array composite material, which comprises: forming a silicon-metal bond passivation layer of even, high-density, well thermal stability on single-crystal silicon by hydrothermal method; preparing nano Fe3O4 particle with un-agglomerated even particle size by microporous-hydrothermal method, then preparing the product by rotation spraying method. This invention improves magnetism and wet sensitive of Fe3O4, and heeds simple devices and low cost.

Description

technical field [0001] The present invention relates to a kind of preparation method of nanocomposite material, especially Fe 3 o 4 / Si nanoporous array composite material preparation method. Background technique: [0002] The problem of traditional porous silicon is that the porous structure is not uniform, the density of silicon nanocrystals is low, and due to the presence of silicon dangling bonds, it is easily oxidized by oxygen and the surface chemical properties are unstable. Traditional nano-Fe 3 o 4 The particle size distribution is uneven, there is agglomeration, and the porosity is low, which limits its application value as a magnetic material and sensor. Therefore, improving Fe 3 o 4 Particle size, distribution and porosity are factors that promote Fe 3 o 4 As a key link in the wide application of magnetic materials and sensor materials in practice. Contents of the invention [0003] The purpose of the present invention is to form a layer of uniform stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/16H01F41/14H01F41/30
Inventor 肖顺华李新建任玮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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