Single-walled carbon nanotube array with chiral selective orientation and method for representing chiral structure thereof

A single-walled carbon nanotube, selective technology, applied in the direction of carbon nanotubes, nanocarbon, nanotechnology, etc., can solve the problems of high instrument cost, harsh operating conditions, complicated sample preparation process, etc., to achieve low cost, easy operation The effect of simplicity and broad application prospects

Active Publication Date: 2013-05-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are limited by factors such as high instrument cost, harsh operating conditions, and complicated sample preparation procedures.

Method used

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  • Single-walled carbon nanotube array with chiral selective orientation and method for representing chiral structure thereof
  • Single-walled carbon nanotube array with chiral selective orientation and method for representing chiral structure thereof
  • Single-walled carbon nanotube array with chiral selective orientation and method for representing chiral structure thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. Preparation of single-walled carbon nanotube arrays with chiral selective orientation on graphite surface

[0040] 1) Cleaning of the substrate: Select a Si single crystal with a 300nm oxide layer on the surface as the substrate for carbon nanotube growth, cut it into a size of 1cm×1cm; ultrasonically clean it in ultrapure water, acetone, ethanol and ultrapure water for 10min , and then blow dry with high-purity nitrogen for later use.

[0041] 2) Select kish graphite as raw material, use Scotch Tape to mechanically peel off different layers of graphite on the surface of Si substrate, use an optical microscope to determine the number and position of graphite layers, and spin-coat 0.1mmol / L FeCl on the surface of the substrate 3 / EtOH solution, the rotation speed is 3000rpm. Use the microcontact printing method to draw 0.1mmol FeCl on the edge pattern of another Si substrate with a 300nm oxide layer 3 / EtOH catalyst strips for the preparation of single-walle...

Embodiment 2

[0045] Embodiment 2, measuring the chiral angle of single-walled carbon nanotubes

[0046] The chiral angle of the single-walled carbon nanotubes with chiral selective orientation prepared in Example 1 is measured, and the chiral angle θ of the carbon nanotubes is the angle between the curl vector direction of graphite and the zigzag direction. like Image 6 a indicates that the axial and radial directions of carbon nanotubes are perpendicular to each other, and the zigzag direction of graphite is perpendicular to the armchair direction. Therefore, the chiral angle of carbon nanotubes is the angle between the axial direction of carbon nanotubes and the edge of graphite armchair. Therefore, if the angle between the graphite indentation and the carbon nanotube axis is for Then the chiral angle θ of the carbon nanotube is If the angle between the graphite notch and the carbon nanotube axis for Then the chiral angle θ of the carbon nanotube is

[0047] In the above ...

Embodiment 3

[0049] Embodiment 3, measuring the optical activity of single-walled carbon nanotubes

[0050] The optical rotation of the single-walled carbon nanotubes with chiral selective orientation prepared in Example 1 was measured. Carbon nanotubes can be divided into right-handed and left-handed according to the size of the chiral angle or the direction of the curl vector (referring to the zigzag edge of graphite), and the chiral angle θ of the right-handed carbon nanotubes is 0°≤θ≤30° , the chiral angle θ of the left-handed carbon nanotube is 30°≤θ≤60°.

[0051] In the above method, the carbon nanotubes have chiral selective orientation on the graphite surface. The optical rotation of carbon nanotubes can be determined according to the relative angle between the axial direction of carbon nanotubes and the notch of graphite, such as Image 6 As shown in b, the angle between the carbon nanotube axis and the graphite notch for Then carbon nanotubes are right-handed; Image 6 As ...

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Abstract

The invention discloses a single-walled carbon nanotube array taking graphite as a substrate and having chiral selective orientation and a method for representing the chiral structure thereof. The preparation method comprises the steps of 1) preparing a graphite substrate with regular nicks on the surface; and 2) arranging the substrate with a single-walled carbon nanotube catalyst growing catalyst and the graphite substrate in a chemical vapor deposition system in an adjacent manner; and growing a single-walled carbon nanotube on the graphite substrate by adopting an airflow orientation method to obtain a single-walled carbon nanotube array with chiral selective orientation. By combining the chiral selective orientation conclusion of the single-walled carbon nanotube on the surface of the graphite substrate with regular nicks on the graphite surface, the chiral angle and optical activity of the single-walled carbon nanotube can be measured, and the single-walled carbon nanotube with the known chiral structure is further subjected to performance test and / or device processing. The measurement method provided by the invention measures the chiral angle and the optical activity of the carbon nanotube at the same time, and can perform batch macroscopic measurement of the carbon nanotube on the sample surface.

Description

technical field [0001] The invention relates to a single-wall carbon nanotube array with chiral selective orientation and a method for characterizing its chiral structure. Background technique [0002] Single-walled carbon nanotubes have a variety of chiral structures according to the curl vector of single-layer graphite, and then exhibit various physical and chemical properties. How to conveniently and accurately determine the chiral structure of single-walled carbon nanotubes seriously restricts its application value in many fields such as nanoelectronics. At present, the commonly used methods for characterizing the chiral structure of single single-walled carbon nanotubes include: ultra-high vacuum scanning tunneling microscopy (UHV-STM), high-resolution transmission electron microscopy (HRTEM), confocal microresonance Raman spectroscopy, etc. However, these methods are limited by factors such as high instrument cost, harsh operating conditions, and complicated sample pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00C01B32/159C01B32/16
Inventor 张锦陈亚彬胡悦
Owner PEKING UNIV
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