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Metallic oxide material with mesoporous-macroporous composite structure as well as preparation method and application thereof

A composite structure and oxide technology, applied in the direction of material resistance, etc., can solve the problems of low specific surface area of ​​the final product, inability to obtain specific surface area, difficult to use quality, etc., to overcome poor structural order, scientific preparation method, Effect of effect improvement

Active Publication Date: 2013-04-17
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both the nanocomposite block-final product and its preparation method have shortcomings. First, the blocky shape makes the specific surface area of ​​the final product low and difficult to improve; secondly, tin dioxide nano The particles are loaded on a porous carbon skeleton with a macropore-mesoporous composite structure. If it is used in an occasion where tin dioxide plays the main role, it will be difficult to obtain the tin dioxide due to too little quality of tin dioxide. Good use effect; finally, the preparation method can not make the final product with both higher specific surface area and pure metal oxide

Method used

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  • Metallic oxide material with mesoporous-macroporous composite structure as well as preparation method and application thereof
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  • Metallic oxide material with mesoporous-macroporous composite structure as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The concrete steps of preparation are:

[0032] Step 1, according to the weight ratio between glucose, water and cetyltrimethylammonium bromide is 1:38:0, it is placed in a closed state, and reacted at a temperature of 100°C for 20h, An intermediate product is obtained. The intermediate product is then subjected to centrifugation, washing and drying; wherein, the rotational speed during centrifugation is 2000r / min, the washing treatment is to wash twice with ethanol and deionized water in sequence, and the drying treatment is to dry at 50°C to obtain Carbon spheres with a sphere diameter of 100 nm.

[0033] Step 2, first mix the metal salt, carbon spheres and ethanol according to the ratio of 0.5:0.05:14 by weight, and then sonicate for 10 minutes; wherein, the metal salt is the acetate or metal halide corresponding to the metal oxide to be prepared , the metal salt is now selected as tin dichloride to obtain a mixture. Then the mixture was refluxed at 0° C. for 20 h...

Embodiment 2

[0036] The concrete steps of preparation are:

[0037] Step 1, according to the weight ratio between glucose, water and cetyltrimethylammonium bromide is 5:39:0.1, it is placed in a closed state, and reacted at a temperature of 120 ° C for 15 hours, An intermediate product is obtained. Then the intermediate product was subjected to centrifugation, washing and drying; wherein, the rotational speed during centrifugation was 3000r / min, the washing treatment was washed three times with ethanol and deionized water in sequence, and the drying treatment was dried at 55°C to obtain Carbon spheres with a sphere diameter of 600 nm.

[0038] Step 2, first mix the metal salt, carbon spheres and ethanol according to the ratio of 3:0.1:15 by weight, and then ultrasonicate for 30 minutes; wherein, the metal salt is the acetate or metal halide corresponding to the metal oxide to be prepared , the metal salt is now selected as tin dichloride to obtain a mixture. Then the mixture was refluxe...

Embodiment 3

[0041] The concrete steps of preparation are:

[0042] Step 1, according to the weight ratio between glucose, water and cetyltrimethylammonium bromide is 10:40:0.3, it is placed in a closed state, and reacted at a temperature of 140 ° C for 10 hours, An intermediate product is obtained. Then, the intermediate product was subjected to centrifugation, washing and drying; wherein, the rotational speed during centrifugation was 4000r / min, the washing treatment was washed 4 times with ethanol and deionized water in sequence, and the drying treatment was dried at 60°C to obtain Carbon spheres with a sphere diameter of 1 μm.

[0043] Step 2, first mix the metal salt, carbon spheres and ethanol according to the weight ratio of 5:0.5:16, and then ultrasonicate for 60 minutes; wherein, the metal salt is the acetate or metal halide corresponding to the metal oxide to be prepared , the metal salt is currently selected as tin tetrachloride to obtain a mixture. Then the mixture was reflu...

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Abstract

The invention discloses a metallic oxide material with a mesoporous-macroporous composite structure as well as a preparation method and an application thereof. The metallic oxide material is in the shape of a thin film with a thickness of 0.3-10 microns, and consists of spherical holes or semispherical holes with a hole diameter being 100-2000nm; hole walls consist of nanometer particles with grain sizes being 10-50nm; and mesopores with hole diameters being 2-50nm are formed among the nanometer particles. The preparation method comprises the following steps: firstly, reacting glucose, water and hexadecyl trimethyl ammonium bromide in a sealed state to obtain an intermediate product; secondly, centrifuging, washing and drying the intermediate product so as to obtain carbon spheres; thirdly, mixing metal salt, the carbon spheres and ethanol, then ultrasonically conducting back-flowing so as to obtain the carbon spheres and a metallic oxide precursor mixture; fourthly, coating the carbon spheres and the precursor mixture on a substrate; and finally, sequentially aging and forging the substrate so as to manufacture a target product. The metallic oxide material can be used as a gas sensitive element; and concentrations of benzene gas, ketone gas, alcohol gas and aldehyde gas can be measured by using resistance variation after gas to be detected is adsorbed.

Description

technical field [0001] The invention relates to a metal oxide material and its preparation method and use, in particular to a metal oxide material with a mesoporous-macroporous composite structure and its preparation method and use. Background technique [0002] The electrical, optical, thermal, magnetic and other properties of nanomaterials are obviously different and superior to those of bulk materials. They have shown bright application prospects and are known as the most promising materials in the 21st century. Electronic industry, energy, catalysis and many other fields have shown important application value. Recently, people have made unremitting efforts in order to obtain nanometer metal oxide materials, as in Porous Carbon / Tin(IV)Oxide Monoliths as Anodes for Lithium-Ion Batteries, Journal of The Electrochemical Society, 2008, 155(9), A658~A663 (porous carbon / tin dioxide bulk material for lithium-ion battery anode, "Journal of the Electrochemical Society", published...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 孟凡利李会华刘金云金震孔令涛孙宇峰刘锦淮
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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