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Large-area ultra-thin carbon nanotube film and its preparation process

A carbon nanotube film and carbon nanotube technology, applied in the field of carbon nanomaterial synthesis and application, can solve the problems of difficulty in forming a continuous film, performance degradation, etc., and achieve the effects of less environmental pollution and simple process operation.

Inactive Publication Date: 2006-07-19
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the carbon nanotube LB film is composed of random stacks of carbon nanotubes with a length of microns, it is difficult to form a continuous film. In many places on the microscopic scale, only some island-shaped single-walled carbon nanotube stacks are included, so its performance will be seriously affected. decline

Method used

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  • Large-area ultra-thin carbon nanotube film and its preparation process
  • Large-area ultra-thin carbon nanotube film and its preparation process

Examples

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Effect test

example 1

[0033] Example 1: Taking the double-walled carbon nanotube film as an example, an alcohol solution is used as a spreading agent and collected with a silicon wafer. The specific steps are:

[0034] 1) Weigh 0.25 g of a mixture of ferrocene and sulfur with a molar ratio of 10:1 and dissolve it in 10 ml of xylene solution to prepare a reaction solution.

[0035] 2) Raise the temperature of the horizontal reaction chamber to 1150°C, feed 2000mL / min of argon and 400mL / min of hydrogen, and send the reaction solution into the reaction chamber at a rate of 0.1mL / min. The black carbon nanotube film produced in the reaction zone drifts out with the airflow and is deposited at the back end of the reaction chamber.

[0036] 3) After the reaction is over, stop feeding the reaction solution, stop feeding hydrogen and reduce the flow rate of argon, and cool the reaction chamber to room temperature.

[0037] 4) Take out the black double-walled carbon nanotube macroscopic body from the reacti...

example 2

[0046] Example 2: Taking the single-walled carbon nanotube film as an example, using acetone solution as the spreading agent and collecting it with a quartz ring, the specific steps are:

[0047] 1) Weigh 0.05 g of a mixture of ferrocene and sulfur with a molar ratio of 100:5 and dissolve it in 10 ml of n-hexane solution to prepare a reaction solution.

[0048] 2) Raise the temperature of the horizontal reaction chamber to 1200°C, feed 3000mL / min of argon and 1000mL / min of hydrogen, and send the reaction solution into the reaction chamber at a rate of 0.05mL / min. The black carbon nanotube film produced in the reaction zone drifts out with the airflow and is deposited at the back end of the reaction chamber.

[0049] 3) After the reaction is over, stop feeding the reaction solution, stop feeding hydrogen and reduce the flow rate of argon, and cool the reaction chamber to room temperature.

[0050] 4) Take out the black single-walled carbon nanotube macroscopic body from the re...

example 3

[0057] Example 3: Taking the multi-walled carbon nanotube film as an example, using alcohol as a spreading agent and collecting it with a metal substrate, the specific steps are:

[0058] 1) Weigh 0.3 g of a mixture of ferrocene and sulfur with a molar ratio of 10:25 and dissolve it in 10 ml of benzene solution to prepare a reaction solution.

[0059] 2) Raise the temperature of the horizontal reaction chamber to 900°C, feed 500mL / min of argon and 200mL / min of hydrogen, and send the reaction solution into the reaction chamber at a rate of 0.3mL / min. The black carbon nanotube film produced in the reaction zone drifts out with the airflow and is deposited at the back end of the reaction chamber.

[0060] 3) After the reaction is over, stop feeding the reaction solution, stop feeding hydrogen and reduce the flow rate of argon, and cool the reaction chamber to room temperature.

[0061] 4) Taking out the multi-walled carbon nanotube macroscopic body from the reaction chamber.

...

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Abstract

The large-area untrathin nano carbon tube film with well feature in microcosmic level comprises nano carbon tubes with centimeter-level length and more then 90wt% purity. Wherein, the least thickness of single-layer film can achieve 20nm with near transparent color and more then 10cm2 film area; there are multiple functional groups on tube surface. It also discloses the opposite preparation technique: with the macroscopic body of nano carbon tube, oxidating the macroscopic body in air; then, dipping into hydroperoxide; adding strong acid to poach till the liquid shows neutrality; finally, adding alcohol or acetone into the liquid to float the tube and form the film.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of carbon nanomaterials. Background technique [0002] Carbon nanotubes are one-dimensional nanomaterials formed by curling one or more layers of graphite sheets according to a certain helical angle. Due to its unique geometric structure and electronic band structure, it brings excellent electrical, optical, mechanical and thermal properties. For example, carbon nanotubes have a current carrying capacity of up to 10 9 A / cm 2 The order of magnitude is 1000 times higher than that of copper; carbon nanotubes can emit luminescence under light induction or electrical excitation; theoretical calculations show that the elastic modulus of carbon nanotubes can be as high as 1TPa, and the ultra-long single-wall carbon nanotube rope The results of macroscopic tensile experiments show that the tensile strength of single-walled carbon nanotube filaments is as high as 2.4GPa, and the elasti...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 韦进全朱宏伟贾怡魏秉庆王志诚王昆林骆建彬刘文今郑明新吴德海
Owner TSINGHUA UNIV
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