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Method for efficient, continuous and selective separation of carbon nanotubes in gas phase

A carbon nanotube and selective technology, applied in the direction of carbon nanotubes, nanocarbon, chemical instruments and methods, etc., can solve the problems of high cost, difficulty in separating metal-type and semiconductor-type carbon nanotubes, and achieve fewer implementation steps , continuous operability, and cost-saving effects

Active Publication Date: 2020-03-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention mainly aims at the problem of high difficulty and high cost in the separation of metallic and semiconducting carbon nanotubes, and further provides a method for efficiently and continuously selectively separating carbon nanotubes in the gas phase

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  • Method for efficient, continuous and selective separation of carbon nanotubes in gas phase

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Embodiment 1

[0021] The method for the gas phase efficient continuous selective separation of carbon nanotubes in this embodiment comprises the following steps:

[0022] Step 1: Preparation of SWCNTs by HiPco method, using CO as carbon source, Fe(CO) 5 As a catalyst, the mixture of carbon source and catalyst is passed into a tube furnace with a temperature of 1000 degrees Celsius, the pressure in the furnace is controlled at 30-50 atm, and the insulation reaction is 1 hour to prepare SWCNTs with a purity of 97%. Take 15g of SWCNTs and 15g of Sodium lauryl sulfate is mixed in the aqueous solution, ultrasonically dispersed, filtered, washed with ethanol, and dried at 100 degrees Celsius for use;

[0023] Step 2: mix the mixed gas of argon and trimethylamine with the well-dispersed SWCNTs from figure 1 The inlet end of the SWCNTs gas phase separation device shown is sent into the container, fully mixed under the action of gas stirring, so that the adsorption of metal-type SWCNTs to amine rea...

Embodiment 2

[0026] The method for the gas phase efficient continuous selective separation of carbon nanotubes in this embodiment comprises the following steps:

[0027] Step 1: Using dichlorobenzene as the carbon source and ferrocene as the catalyst, SWCNTs are prepared by chemical vapor deposition, using argon to discharge the residual air in the furnace and then introducing hydrogen, wherein the amount of argon is 800 Sccm and the amount of hydrogen is 2000 Sccm; The dichlorobenzene solution with ferrocene enters the furnace tube through the carrier gas, and reacts at 1100 degrees Celsius to obtain SWCNTs; take 30g of SWCNTs and 35g of sodium cholate and mix them in the aqueous solution, ultrasonically disperse evenly, filter, and wash with ethanol , dried at 100 degrees Celsius for later use;

[0028] Step 2: Mix the mixed gas of nitrogen and isopropylamine vapor with the well-dispersed SWCNTs from figure 1 The inlet end of the SWCNTs gas phase separation device shown is sent into the...

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Abstract

The invention relates to a method for efficient, continuous and selective separation of carbon nanotubes in a gas phase. The method includes the steps of: 1. using a surfactant to disperse carbon nanotube powder into single carbon tubes, performing filtering, and then conducting drying to obtain dispersed carbon nanotubes; and 2. mixing a carrier gas with liquid amine steam, then feeding the obtained mixture and the dispersed carbon nanotubes into a separation device, fully mixing the materials under the action of gas stirring to make the adsorption of metal carbon nanotubes on amine reach saturation, then introducing an electric field to enrich the metal carbon nanotubes at the cathode of the electrode under the action of the electric field force and gravity. The method has the advantagesof simplicity, high efficiency and continuous operability, and compared with the previous method of separating metal type SWCNTs in a liquid phase, the method provided by the invention has few implementation steps, is simpler, efficient and practicable, and is suitable for batch separation and purification.

Description

technical field [0001] The invention belongs to a method for separating inorganic materials, in particular to a method for selectively separating metal-type and semiconductor-type carbon nanotubes in a gas phase with high efficiency and continuously. Background technique [0002] SWCNTs prepared by laser evaporation, arc discharge and chemical vapor deposition are all mixtures of metal and semiconductor SWCNTs. Studies have shown that metal-type SWCNTs account for about one-third of SWCNTs, and semiconductor-type SWCNTs account for about two-thirds. Metal-type SWCNTs have excellent conductivity, and their conductivity is 2-3 orders of magnitude higher than that of copper. They are expected to be used in high-conductivity transparent electrodes, nanoscale metal wires for integrated circuits, and solar cells. Semiconducting SWCNTs have excellent electron mobility, and have good application prospects in the fields of high-sensitivity chemical and biological sensors, high-perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/17C01B32/172
CPCC01B32/17C01B32/172
Inventor 吴少军薛祥侯红亮
Owner HARBIN INST OF TECH
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