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Method for truncating length-controlled carbon nanotubes

A technology of carbon nanotubes and dilute nitric acid, applied in the field of preparation of nano-catalyst materials, can solve the problems of long time, lack of practical significance for large-scale application, difficult separation, etc., to achieve mild conditions, maintain physical properties, and good physical properties. Effect

Inactive Publication Date: 2010-02-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the processing method of ball milling often takes a long time. As reported in (Chemical Physics Letters, 2001, 335, 1), it takes 120 hours of ball milling to obtain carbon tubes with a diameter of about 500 nanometers.
In addition, chopped carbon nanotubes are mixed with abrasives and difficult to separate
The methods of high-power ultrasound and ultra-high voltage are described in literature (carbon, 1996, 34, 814) and literature (US2007119372-A1). These two methods are only limited to the processing of trace carbon nanotubes for research purposes. The application of the lack of practical significance

Method used

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  • Method for truncating length-controlled carbon nanotubes
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  • Method for truncating length-controlled carbon nanotubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Get 3 grams of carbon nanotubes and put them into a flat-bottomed flask, add 2:1 (V H2O / mass concentration 68% V HNO3 , volume ratio) of dilute nitric acid 120ml, then refluxed in an oil bath at 110°C for 5 hours, and finally filtered and washed with deionized water, and dried at 100°C for 2 hours to obtain purified carbon nanotubes with a hydrophilic surface. Electron microscope photos are attached figure 1 . It can be seen from the transmission electron microscope photos that the multi-walled carbon nanotubes cannot be truncated after being treated with dilute nitric acid, and the length of most of the multi-walled carbon nanotubes is more than 3 microns.

[0036] 2. Take 1 g of the carbon nanotubes obtained in 1, add 23.1 ml of 0.02 mol / L silver nitrate solution, then add 10 ml of water, and mix well. Then stir at a speed of 160r / min in an 80°C water bath until dry. Finally, it was dried in an oven at 100° C. for 2 hours.

[0037] 3. Heat the sample obtaine...

Embodiment 2

[0039] 1. Get 4 grams of carbon nanotubes and put them into a flat-bottomed flask, add 2:1 (V H2O / mass concentration 68% V HNO3 ) of dilute nitric acid 200ml, then refluxed at 110°C for 5 hours in an oil bath, and finally filtered and washed with deionized water, and dried at 100°C for 2 hours.

[0040] 2. Take 0.5 g of carbon nanotubes obtained in 1, add 1.16 ml of 0.08 mol / L silver nitrate solution, then add 20 ml of water and mix well. Then stir at a speed of 160r / min in an 80°C water bath until dry. Finally, it was dried in an oven at 100° C. for 2 hours.

[0041] 3. Heat the sample obtained in 2 to 300°C at a rate of 2K / min in flowing He gas, then cool it down to room temperature, and then switch to 5% O 2 / He (V / V, volume percentage) mixed gas, heated to 300°C at a rate of 2K / min and maintained at this temperature for 105 minutes, and finally cooled to room temperature to obtain truncated carbon nanotubes. The overall yield of carbon nanotubes was 80%. Transmission...

Embodiment 3

[0043] 1. Get 4 grams of carbon nanotubes and put them into a flat-bottomed flask, add 2:1 (V H2O / mass concentration 68% V HNO3 ) of dilute nitric acid 200ml, then refluxed at 110°C for 5 hours in an oil bath, and finally filtered and washed with deionized water, and dried at 100°C for 2 hours.

[0044] 2. Take 0.5 g of carbon nanotubes obtained in 1, add 0.29 ml of 0.08 mol / L silver nitrate solution, then add 20 ml of water and mix well. Then stir at a speed of 160r / min in an 80°C water bath until dry. Finally, it was dried in an oven at 100° C. for 2 hours.

[0045] 3. Heat the sample obtained in 2 to 300°C at a rate of 2K / min in flowing He gas, then cool down to room temperature, and then switch to 5% O 2 / He (V / V, volume percentage) mixed gas, heated to 300°C at a rate of 2K / min and maintained at this temperature for 105 minutes, and finally cooled to room temperature to obtain truncated carbon nanotubes. The overall yield of carbon nanotubes was 93%. Transmission e...

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Abstract

The invention provides a method for truncating length-controlled carbon nanotubes, which can control to truncate and obtain the carbon nanotubes with required lengths, and comprises the following steps: loading metal catalyst particles with catalytic oxidation performance on the carbon nanotubes; performing oxidation treatment at an atmosphere with certain oxygen content; and enabling the positions of the carbon nanotubes where the metal particles fall off to generate catalytic oxidation reaction so as to truncate the carbon nanotubes. The carbon nanotubes with different length distribution can be obtained by controlling the loading quantity and dispersion of the metal catalyst. The method has the characteristics of mild operation conditions, controllable lengths of the carbon nanotubes and high yield.

Description

technical field [0001] The invention relates to a controllable truncation method of carbon nanotubes, in particular to a chemical oxidation truncation method under mild conditions, and belongs to the field of preparation of nanometer catalytic materials. Background technique [0002] Carbon nanotubes are novel carbon materials with many exotic properties, such as high strength, low density, strong electrical conductivity, high specific area, etc., so they have broad application prospects in the fields of catalysis, materials engineering, and electronics. However, the length of carbon nanotubes produced by CVD or arc discharge method is more than ten to several hundred microns long. When applied in these fields, it involves how to truncate carbon nanotubes, so as to better To maximize the excellent properties of carbon nanotubes. [0003] In the literature, there are mainly two methods for truncating carbon nanotubes: chemical methods and physical methods, or two methods are...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 包信和王传付潘秀莲郭淑静陈为
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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