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Method for separating metallic single-wall carbon nano-tube

A technology of single-walled carbon nanotubes and metal separation, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve problems such as device pollution and unfavorable performance of nanoelectronic devices

Inactive Publication Date: 2008-02-20
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since octadecylamine itself is an insulating molecule, it will form an electron transport barrier between the carbon tube and the connected electrode, which is not conducive to the performance of nanoelectronic devices.
In addition, octadecylamine belongs to surfactant molecules, which may cause pollution to devices

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] Implementation example 1 : Purification of carbon tubes

[0030] Since the carbon tube powder used in the experiment itself has certain impurities, it is necessary to carry out purification treatment, for example, adopt the treatment method provided by the prior art, which can make the subsequent separation more effective and reliable. If the used carbon tube powder itself is relatively pure, the purification treatment step may not be used.

[0031] The purification method used in the present embodiment is: first, 1 weight part of carbon nanotubes and 10 weight parts of concentrated hydrochloric acid solution added with 4 weight parts of sodium lauryl sulfate or sodium dodecylsulfonate, ultrasonic 3~ After 4 hours, stand still, remove the upper layer acid solution after the carbon tubes settle, add new acid solution with surfactant and sonicate again, in order to fully remove the catalyst particles in the carbon nanotubes, this step should be repeated until the color o...

Embodiment 2

[0032] Implementation example 2 : Modification and product separation with 6,13-bis(2-(trimethylsilyl)ethynyl)pentacene

[0033] 1 part by weight of the purified single-walled carbon nanotubes obtained in Example 1 was mixed with 0.1 part by weight of 6,13-bis(2-(trimethylsilyl)ethynyl)pentacene in chloroform and ultrasonically mixed for 3.5 hours , centrifuge at 12000 rpm in a high-speed centrifuge to collect the supernatant and precipitate. Precipitation is a product enriched in semiconducting carbon tubes. The supernatant was filtered with a 0.22 micron microporous membrane, and then washed with a large amount of solvent to remove a small amount of unadsorbed or desorbed 6,13-bis(2-(trimethylsilyl)ethynyl)pentacene. The product on the filter membrane is collected to obtain a metal-enriched carbon tube product.

[0034] The characterization of the isolated product is shown in Figure 1, Figure 2, Figure 3 and Figure 4.

Embodiment 3

[0035] Implementation Example 3 : Modification and product separation with anthracene

[0036] 1 part by weight of the purified single-walled carbon nanotubes obtained in Example 1 was mixed with 0.1 part by weight of anthracene in chloroform and ultrasonicated for 3.5 hours, then centrifuged in a high-speed centrifuge at a speed of 12000 rpm, and the supernatant and precipitate were collected respectively. Precipitation is a product enriched in semiconducting carbon tubes. Filter the supernatant with a 0.22 micron microporous membrane to remove the solvent, and wash with a large amount of solvent to remove a small amount of unadsorbed or desorbed anthracene. The product on the filter membrane is collected to obtain a metal-enriched carbon tube product.

[0037] The characterization of the isolated product is shown in Figure 3.

[0038] The tube diameter distribution of the samples obtained in Example 2 and Example 3 and the content of metal tubes and semiconductor carbon ...

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Abstract

The invention discloses a method to separate and enrich a metallic carbon tube with special electrical performance from single-walled carbon nanotubes. The method of the invention is that: a right amount of to be separated carbon nano tubes and separating promoter are added into an organic solvent, and the system is ultrasonically mixed, so that the separating promoter can fully absorb specific carbon nano tubes, then precipitation in the solution is removed and the liquid is remained; and then the carbon tubes suspending in the liquid are separated, the organic solvent is used for cleaning the carbon tubes to remove the organic that is not absorbed by the carbon tubes, thus, the product enriched with metallic carbon tubes is prepared. The separating promoter adopted by the invention is a compound with a linear condensed nucleus aromatic hydrocarbon structure, the condensed nucleus part of the compound comprises at least three aromatic rings.

Description

technical field [0001] The invention relates to a method for separating single-walled carbon nanotubes applied to micro-nano optoelectronic devices. Especially the method of separating and enriching metallic carbon tubes with specific electrical properties from single-walled carbon nanotubes. Background technique [0002] Carbon nanotubes have many excellent characteristics, such as extremely high aspect ratio, high strength, high toughness, good chemical stability and thermal stability, and special electrical properties, making them suitable for composite reinforcement materials, nanoelectronic devices, field emission Electrodes, energy materials and many other fields have received extensive attention and research. [0003] The electrical properties of single-walled carbon nanotubes are controlled by the diameter and configuration of the carbon tubes. The configuration of carbon nanotubes is usually expressed by two chiral characteristic parameters (n, m). When m=n, the c...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82B3/00
Inventor 刘彩虹张浩力张永辉魏瑞瑞李炳瑞
Owner LANZHOU UNIVERSITY
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