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Method for selecting and separating single-walled carbon nanotubes with specific diameter and chirality, and application thereof

A single-walled carbon nanotube, a specific technology, applied in the direction of single-walled carbon nanotubes, carbon nanotubes, nanocarbons, etc., can solve problems such as separation difficulties, and achieve the effect of simple and efficient method, low cost, and excellent performance.

Active Publication Date: 2017-10-24
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the separation of monochiral carbon nanotubes with a diameter in the range of 1.1-1.3nm, which is most suitable for semiconductor devices, is still rare, and it is even more difficult to separate the monochiral carbon nanotubes that can simultaneously meet the purity required by the device. No such report has been seen so far.

Method used

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  • Method for selecting and separating single-walled carbon nanotubes with specific diameter and chirality, and application thereof
  • Method for selecting and separating single-walled carbon nanotubes with specific diameter and chirality, and application thereof
  • Method for selecting and separating single-walled carbon nanotubes with specific diameter and chirality, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: 50 mg of a conjugated polymer with the structure shown in formula I and 25 mg of HiPCO-type single-walled carbon nanotubes were dissolved in 100 mL of toluene solvent. Disperse by ultrasound for 20 minutes, and then centrifuge at a speed of 20,000 g for 30 minutes. The supernatant obtained is the obtained narrow chiral single-walled carbon nanotube solution. Using near-infrared-visible-ultraviolet absorption spectroscopy (UV-Vis-NIR) (see figure 1 ), two-dimensional fluorescence spectroscopy and three-dimensional fluorescence spectroscopy (PLE) (see figure 2 ) to test, combined with three kinds of spectral results to prove that the separated supernatant mainly contains (10,8) single-walled carbon nanotubes. The single-walled carbon nanotube powder with large diameter and narrow chirality can be obtained by filtering and drying, and the purity of the (10,8) type single-walled carbon nanotube is >80%.

[0052]

[0053] Wherein the number average molecula...

Embodiment 2

[0054] Example 2: 100 mg of a conjugated polymer with the structure shown in formula II and 25 mg of CoMoCat type single-walled carbon nanotubes were dissolved in a mixed solvent of 96 mL of toluene and 4 mL of hexane. Disperse by ultrasound for 3h, and then centrifuge at a speed of 100000g for 2h. The supernatant obtained is the obtained narrow chiral single-walled carbon nanotube solution. Then through ultra-high speed centrifugation, the centrifugal speed is 800000g, and the centrifugation time is 2 hours, the lower precipitated solid is collected and dried, and the carbon nanotube powder that basically removes the conjugated polymer can be obtained, and the purity of the (10,8) type single-walled carbon nanotube >90%.

[0055]

[0056] Where n=10, the number average molecular weight is 5500.

Embodiment 3

[0057] Example 3: On a single-crystal silicon wafer with a surface of 200 SiO, the narrow-chiral single-walled carbon nanotube solution obtained in Example 1 can be prepared into monochiral semiconducting carbon nanotubes by spin coating or drop coating film (see image 3 ), by controlling the concentration of carbon nanotubes in the solution and the conditions of film formation, the density of carbon nanotubes in the film can be regulated. On this film, a gold source-drain electrode with a micron-scale channel is prepared by photolithography technology combined with an electron beam coating technology, and a micron-scale thin film transistor with a single-chiral single-walled carbon nanotube can be obtained. The device channel L=20 microns, W = 400 µm, V ds =-1V. refer to Figure 4 Shown is the transfer curve plot for this transistor device. It can be seen that the switching ratio of the transistor device exceeds 10 6 .

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Abstract

The invention discloses a method for selecting and separating single-walled carbon nanotubes with specific diameter and chirality, and application thereof. The method comprises the following steps: mixing single-walled carbon nanotube raw materials and a conjugated polymer into a dispersing medium uniformly to form a dispersing solution; and separating the dispersing solution to form a solid phase part and a liquid phase part, and enriching the single-walled carbon nanotubes with specific diameter and chirality at the liquid phase part, wherein the conjugated polymer is selected from an alternating copolymer of meta-position pyridine and dialkyl fluorene. The method is simple and efficient, diameter and chiral selectivity is extremely high, and low-cost and large-scale batched preparation of single-walled carbon nanotubes with specific diameter and chirality can be realized; furthermore, the obtained single-walled carbon nanotubes with specific diameter and chirality can be used for preparing large-area uniform films easily and have excellent performance in the application aspect of micro-nano electronic devices.

Description

technical field [0001] The invention particularly relates to a method for selectively separating single-walled carbon nanotubes with specific diameter and chirality, and belongs to the technical field of carbon nanotubes. Background technique [0002] Single-walled carbon nanotubes (SWCNTs) have a unique one-dimensional nanostructure, and their excellent optical, electronic, mechanical, thermodynamic and other properties make them very useful in many fields, especially in the fields of integrated circuits and field effect transistors. Application prospect. Currently, the methods for synthesizing single-walled carbon nanotubes are divided into chemical vapor deposition, arc catalysis, and laser evaporation. A mixture of walled carbon nanotubes. About 1 / 3 of them are metallic SWCNTs, and 2 / 3 are semiconductor SWCNTs. [0003] Semiconducting SWCNT is an excellent semiconducting nanomaterial with an intrinsic carrier mobility as high as 70,000 cm 2 V -1 the s -1 , and larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/172B82Y40/00H01L29/16H01L31/028H01L51/54
CPCH01L29/16H01L31/028C01B2202/02C01B2202/36C01B2202/20C01P2004/04H10K85/221Y02E10/547Y02E10/549
Inventor 顾健婷李红波金赫华李清文邱松韩杰纪其燕
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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