Method for efficiently and controllably chopping carbon nanotubes in gas phase

A technology of carbon nanotubes and chopping, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., and can solve the problem of intrinsic structure damage of chopped carbon nanotubes, poor controllability of chopped carbon nanotubes, and short-cut carbon nanotubes. Low yield of nanotubes and other problems, to achieve the effect of high efficiency, strong controllability and high efficiency

Pending Publication Date: 2022-04-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the main problems currently faced are: (1) the intrinsic structure of chopped carbon nanotubes is severely damaged, which affects its subsequent application; (2) the yield of chopped carbon

Method used

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  • Method for efficiently and controllably chopping carbon nanotubes in gas phase
  • Method for efficiently and controllably chopping carbon nanotubes in gas phase
  • Method for efficiently and controllably chopping carbon nanotubes in gas phase

Examples

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Example Embodiment

[0038] Example 1.

[0039] In this embodiment, the method of high-efficiency controllable short-cut carbon nanotubes is as follows:

[0040] (1) Dispersion of carbon nanotubes

[0041] Weigh 4.5mg surfactant (poly (3-dodecylthiophene-2,5-di)), 3 mg carbon nanotube ( figure 2 And 15 ml of toluene and mixed in the reagent bottle, and the ultrasonic dispersion was performed at a power of 200 W for 30 min to give a carbon nanotube dispersion. Well 10 min in a water bath at 60 ° C to obtain a carbon nanotube dispersed in a silicon substrate surface ( image 3 . Among them, the carbon nanotubes are single-walled carbon nanotubes having a length of 50 μm and a diameter of 2 nm.

[0042] (2) High temperature heat treatment carbon nanotubes

[0043] The resulting dispersed carbon nanotube silicon-based silicon nanotubes were placed in the quartz boat in the quartz boat, and the quartz boat was placed in the constant temperature zone of the tube furnace. Under the protection of argon (volume...

Example Embodiment

[0048] Example 2 Changes the aspigenic homoperative condition to regulate the short cut length of carbon nanotubes.

[0049] In this embodiment, the method of high-efficiency controllable short-cut carbon nanotubes is as follows:

[0050] (1) Dispersion of carbon nanotubes. Similarly to step (1) in Example 1.

[0051] (2) The heat treatment of carbon nanotubes. As in step (2) in Example 1.

[0052] (3) Air plasma treatment of carbon nanotubes. The air plasmon processing time of 3 W is 10s, and other steps (3) in Example 1 are the same.

[0053] (4) The gas phase cut treatment of carbon nanotubes. As in step (4) in Example 1. The morphology and length distribution of the carbon nanotubes after the short cut Image 6 Indicated. From Image 6 A carbon tube can be seen in a few paragraphs, and the length distribution statistics ( Image 6 b), the average length is 121 nm and the length ranges from 75 to 200 nm. Comparative Example 1, the average length was shortened by 54 nm. It has prov...

Example Embodiment

[0054] Example 3 Regulating gas phase reaction kinetics control the length of the short cut carbon nanotubes.

[0055] In this embodiment, the method of high-efficiency controllable short-cut carbon nanotubes is as follows:

[0056] (1) Dispersion of carbon nanotubes. Similarly to step (1) in Example 1.

[0057] (2) The heat treatment of carbon nanotubes. As in step (2) in Example 1.

[0058] (3) Hydrogen plasma treatment of carbon nanotubes. As in step (3) in Example 1.

[0059] (4) The gas phase cut treatment of carbon nanotubes. Unlike Example 1, the reaction temperature was 780 ° C, the concentration of water vapor was 5000 ppm, and the treatment time was 15 min.

[0060] This embodiment achieves a short cut length regulation by regulating the reaction temperature, etch gas concentration and reaction time, etc. Figure 7 Indicated. From Figure 7 A carbon nanotube is known as a short cut, the atomic force microscope statistics and calculates its average length of 91 nm. Figure 7...

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Abstract

The invention relates to the field of processing of low-dimensional nano materials, in particular to a method for efficiently and controllably chopping a carbon nanotube in a gas phase. The method comprises the following steps: controllably introducing a structure defect on a carbon nanotube, and reacting with an etching gas with certain chemical reactivity, thereby realizing controllable chopping of the carbon nanotube. The method specifically comprises the following steps: ultrasonically dispersing a carbon nanotube with the length of hundred microns, then monodispersing the carbon nanotube onto a substrate, controllably introducing defects with certain density into the tube wall of the carbon nanotube by adopting plasma treatment, and further introducing etching gas with proper chemical activity, so that the etching gas preferentially reacts with the carbon nanotube at the defect position to realize short cutting. The defect density is regulated and controlled by regulating and controlling the intensity and the time of the plasma, and the length and the efficiency of the chopped carbon nanotubes are regulated and controlled by regulating and controlling the concentration of the etching gas, the reaction temperature, the reaction time and the like. According to the method, fine processing of the carbon nanotubes can be realized, and application of the carbon nanotubes in the fields of nano-electronic devices, drug delivery, confinement catalysis, gas sensing and the like is promoted.

Description

technical field [0001] The invention relates to the processing field of low-dimensional nanomaterials, specifically a method for efficiently and controllably gas-phase chopping carbon nanotubes, which is expected to promote the application of carbon nanotubes in the fields of confined catalysis, drug delivery, and micro-nano devices. Background technique [0002] Carbon nanotubes have excellent physical and chemical properties due to their unique one-dimensional hollow tubular structure. Its unique nanoscale lumen is the thinnest "nanoreactor", which can be used as a "template" to fill and prepare new low-dimensional nanomaterials such as ultrafine nanoparticles and ultrafine nanowires. However, the length of direct-grown high-quality carbon nanotubes is generally on the order of hundreds of microns, which seriously affects the filling efficiency and the controllability of the filling process. Based on this, researchers have developed methods for short-cutting carbon nanotu...

Claims

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Application Information

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IPC IPC(8): C01B32/176B82Y30/00B82Y40/00
Inventor 刘畅郑雪张峰侯鹏翔张子初成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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