In-situ synthesis method for nano tin dioxide/carbon nano tube composite material

A technology of nano-tin oxide and carbon nanotubes, applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of large nano-SnO2 particle size, weak carbon nanotube binding, harsh preparation conditions, etc., and achieve short preparation cycle , good crystallization and uniform particle size

Inactive Publication Date: 2010-05-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

[0005] 1), the sol-gel method and the uniform precipitation method are simple and easy to operate, but the high-temperature heat treatment (crystallization process) in the preparation process is easy to cause nano-SnO 2 The growth and hard agglomeration of the obtained nano-SnO 2 Larger particle size (20-100nm);
[0006] 2), Zettl's chemical solution method is simple, but the preparation process at room temperature makes SnO 2 The degree of crystallinity is low and the combination with carbon nanotubes is weak;
[0007] 3) The thin film prepared by chemical vapor deposition method has excellent performance, but the required equipment is complicated, the preparation conditions are harsh, the reaction temperature is high, and the cost is high

Method used

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  • In-situ synthesis method for nano tin dioxide/carbon nano tube composite material
  • In-situ synthesis method for nano tin dioxide/carbon nano tube composite material
  • In-situ synthesis method for nano tin dioxide/carbon nano tube composite material

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Effect test

specific Embodiment 1

[0033] Step 1, reflux the multi-walled carbon nanotubes with concentrated nitric acid at 120°C for 5 hours, then wash with deionized water several times until the pH of the washing solution = 7, and then dry at 60°C to obtain surface-functionalized multi-walled carbon nanotubes Tube;

[0034] Step 2, 1.354g of SnCl 2 .2H 2 O was dissolved in 20ml of absolute ethanol and stirred to form Sn 2+ Concentration is the stannous chloride solution of 0.3mol / L; According to the mass ratio (1:100) of carbon nanotubes and tin salt, the carbon nanotubes that acidification process is added in 20ml dehydrated alcohol ultrasonic dispersion 20min, form carbon suspension of nanotubes;

[0035] Step 3, while stirring, add the suspension of carbon nanotubes prepared in step 2 to the SnCl 2 solution, then continue to stir for 20 minutes, and then ultrasonic 10 minutes to form a mixed solution;

[0036] Step 4, while stirring, add an aqueous solution of NaOH with a concentration of 0.4 mol / L d...

specific Embodiment 2

[0040] Step 1, the multi-walled carbon nanotubes are treated with a mixed acid of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 1:3 at 120° C. for 5 hours, and then washed with deionized water for several times until the washing liquid is neutral, and then heated at 60 ℃ drying to obtain surface functionalized multi-walled carbon nanotubes.

[0041] Step 2, 1.354g of SnCl 2 2H 2 O was dissolved in 20ml of absolute ethanol and stirred to form Sn 2+ Concentration is the stannous chloride solution of 0.3mol / L; According to the weight ratio (1:100) of carbon nanotubes and tin salt, the carbon nanotubes that acidification process is added in 20ml dehydrated alcohol ultrasonic dispersion 20min, form carbon suspension of nanotubes;

[0042] Step 3, while stirring, add the suspension of carbon nanotubes prepared in step 2 to the SnCl 2 solution, then continue to stir for 20 minutes, and then ultrasonic 10 minutes to form a mixed solution;

[0043]...

specific Embodiment 3

[0047] Step 1, reflux the multi-walled carbon nanotubes with concentrated nitric acid at 120°C for 5 hours, then wash with deionized water several times until the pH of the washing solution is 7, and then dry at 60°C to obtain surface-functionalized multi-walled carbon nanotube.

[0048] Step 2, 1.354g of SnCl 2 2H 2 O was dissolved in 20ml of absolute ethanol and stirred to form Sn 2+ Concentration is the tin protochloride solution of 0.3mol / L; According to the weight ratio (5:100) of carbon nanotubes and tin salt, the carbon nanotubes that acidification process is added in 20ml dehydrated alcohol ultrasonic dispersion 20min, form carbon suspension of nanotubes;

[0049] Step 3, while stirring, add the suspension of carbon nanotubes prepared in step 2 to the SnCl 2 solution, then continue to stir for 20 minutes, and then ultrasonic 10 minutes to form a mixed solution;

[0050] Step 4, while stirring, add ammonia water with a mass concentration of 7% dropwise to the mixed...

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Abstract

The invention discloses an in-situ synthesis method for a nano tin dioxide/carbon nano tube composite material, which mainly uses an inorganic tin salt, a carbon nano tube and an alkali source as raw materials. The experimental process mainly comprises the steps of precursor preparation, hydrothermal reaction, precipitate washing and drying and the like. The in-situ synthesis method for the nano tin dioxide/carbon nano tube composite material has the advantages that: a hydrothermal method is adopted to realize the in-situ deposition and the growth of the nano tin dioxide on the surface of the carbon nano tube; the obtained SnO2 nano particles have small and uniform particle size (less than 10nm), are well-crystallized, are uniformly coated on the surface of the carbon nano tube, and are tightly combined with the carbon nano tube; the composite material has potential application prospect in the aspects of a gas sensor material, an anode material of a lithium ion battery and the like. The method has no addition of any surface active agent, has simple and easily-obtained materials, simple process without pollution, short preparation period, mild reaction condition and low cost, and is suitable for large-scale production, so the method is an environment-friendly synthesis method.

Description

technical field [0001] The invention relates to a preparation method of a nanometer composite material, in particular to a method for in-situ synthesis of a nanometer tin oxide / carbon nanotube composite material. Background technique [0002] Existing tin oxide (SnO 2 ) has a natural non-stoichiometric and stable tetragonal rutile structure, and has been widely used in gas sensors due to its excellent gas sensing properties. SnO 2 The gas-sensing response of gas-sensing materials is a very complex surface reaction that occurs on the solid-gas interface. The first step to produce a gas-sensing response is the diffusion of the target gas and its adsorption on the surface of the gas-sensing material, so smooth gas diffusion Channels, large specific surface area, and sufficient surface active sites are the keys to obtain excellent gas-sensing performance. In order to improve the SnO 2 The gas-sensing properties of gas-sensing materials are mostly adopted by means of nanomete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00
Inventor 郭艳群李月杨晔谭瑞琴宋伟杰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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