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Process of preparing polycrystalline nanotube of metal oxide

A technology of multi-walled carbon nanotubes and nanotubes, applied in chemical instruments and methods, oxide/hydroxide preparation, tin oxide, etc., can solve problems such as low yield, large particles, and incomplete removal of alumina templates. Achieve the effect of large output and small particles

Inactive Publication Date: 2009-12-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, metal oxide nanotubes are generally prepared by anodic alumina template method, but due to the disadvantages of low yield, larger particles, thicker diameter and incomplete removal of alumina template, this method greatly limits the production of metal oxide nanotubes. Applications in Lithium-ion Batteries

Method used

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  • Process of preparing polycrystalline nanotube of metal oxide
  • Process of preparing polycrystalline nanotube of metal oxide
  • Process of preparing polycrystalline nanotube of metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Add 60 mg of multi-walled nanotube carbon to 50 ml of 0.5 mol / L sodium chloride aqueous solution, and ultrasonic for 1 hour, add 20 ml of 0.02 mol / L polyallylamine hydrochloride solution, stir for 0.5 hour, use Centrifugal cleaning with deionized water;

[0021] 2) Add 20 milliliters of 0.04 mol / liter sodium polystyrene sulfonate solution, stir for 0.5 hours, and centrifuge and wash with deionized water;

[0022] 3) Add 20 milliliters of 0.02 mol / liter polyallylamine hydrochloride solution, stir for 0.5 hours, and centrifuge and wash with deionized water;

[0023] 4) Re-disperse the cleaned powder ultrasonically in 100 ml of deionized water, and add 0.5 mmol of indium chloride;

[0024] 5) 20 ml of 0.1 mol / L sodium borohydride aqueous solution was added dropwise to the above solution, the prepared material was centrifuged, dried, and then heat-treated in an oxygen atmosphere at 500° C. for 3 hours to obtain indium oxide nanotubes.

[0025] figure 1 with figure 2...

Embodiment 2

[0027] 1) Add 60 mg of multi-wall nanotube carbon to 20 ml of 0.5 mol / L sodium chloride aqueous solution, and ultrasonically for 1 hour, add 20 ml of 4 mol / L polyallylamine hydrochloride solution, stir for 0.5 hour, and use Centrifugal cleaning with deionized water;

[0028] 2) Add 20 ml of 0.02 mol / L sodium polystyrene sulfonate solution, stir for 0.5 hour, and then centrifuge and wash with deionized water;

[0029] 3) Add 20 ml of 0.4 mol / L polyallylamine hydrochloride solution, stir for 0.5 hour; centrifuge and wash with deionized water;

[0030] 4) Re-disperse the cleaned powder ultrasonically in 100 ml of deionized water, and add 5 mmol of indium chloride;

[0031] 5) Add 50 ml of 0.1 mol / L sodium borohydride aqueous solution dropwise to the above solution. The prepared material was centrifuged, dried, and then heat-treated in an oxygen atmosphere at 1000° C. for 5 hours to obtain indium oxide nanotubes. The result was similar to Example 1.

Embodiment 3

[0033] 1) Add 120 mg of multi-walled carbon nanotubes to 200 ml of 0.5 mol / L sodium chloride aqueous solution, and sonicate for 1 hour,) add 20 ml of 0.08 mol / L polyallylamine hydrochloride solution, and stir for 0.5 hour, Centrifugal cleaning with deionized water;

[0034] 2) Add 20 milliliters of 0.04 mol / liter sodium polystyrene sulfonate solution, stir for 0.5 hours, and centrifuge and wash with deionized water;

[0035] 3) Add 20 milliliters of 0.08 mol / liter polyallylamine hydrochloride solution, stir for 0.5 hours, and centrifuge and wash with deionized water;

[0036] 4) Re-disperse the cleaned powder ultrasonically in 100 ml of deionized water, and add 1 mmol of nickel chloride;

[0037] 5) 500 ml of 0.1 mol / L sodium borohydride aqueous solution was added dropwise to the above solution, the prepared material was centrifuged, dried, and then heat-treated in an oxygen atmosphere at 700° C. for 3 hours to obtain nickel oxide nanotubes.

[0038] image 3 with Figure ...

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Abstract

The method for preparing metal oxide polycrystalline nanotubes disclosed in the present invention has the following steps: 1) adding multi-walled carbon nanotubes to an aqueous sodium chloride solution, ultrasonically dispersing, and then adding a positively charged polyacrylamine hydrochloride solution , so that polyacrylamine hydrochloride is coated on the surface of the multi-walled carbon nanotubes; 2) The product obtained in step 1) is added to the negatively charged sodium polystyrene sulfonate solution, so that the sodium polystyrene sulfonate is coated Covering the surface of the product in step 1); 3) adding the product obtained in step 2) to a positively charged solution of polyacrylamine hydrochloride, so that polyacrylamine hydrochloride is coated on the surface of the product in step 2); 4) Disperse the product obtained in step 3) in deionized water, add metal chloride, dropwise add sodium borohydride aqueous solution, centrifuge, dry, and heat treatment in an oxygen atmosphere. The invention uses carbon tubes as templates, and can prepare nanotubes of various metal oxides by self-organizing layers of positive and negative charges, and has the advantages of large yield, small particles, fine diameters, and easy removal of templates.

Description

technical field [0001] The invention relates to a method for preparing metal oxide polycrystalline nanotubes. Background technique [0002] Metal oxide bulk materials are widely used in optoelectronic fields such as lithium batteries, gas sensors, and ultraviolet detectors. Due to recent developments in nanotechnology, many properties different from bulk metal oxides have been discovered. For example, the tunability of the forbidden band width caused by the nanometer size effect, the discovery of laser light at room temperature, and the improvement of the performance of gas sensors and lithium batteries, etc. Among the existing nanostructures, porous nanotubes are considered to be a class of lithium-ion battery materials with great potential due to their high specific surface area, difficulty in agglomeration, and easy penetration of lithium ions in them. At present, metal oxide nanotubes are generally prepared by anodic alumina template method, but due to the disadvantage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G15/00C01G53/04C01G19/02C01G51/04C01G49/02C01G45/02C01B13/14B82B3/00
Inventor 杨德仁张辉杜宁
Owner ZHEJIANG UNIV
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