Preparation method of ultra-narrow graphene nanobelts

A graphene nanoribbon and ultra-narrow technology, applied in the field of graphene, can solve the problems of large width of graphene nanoribbons, inability to synthesize graphene nanoribbons, and complicated design of precursors.

Pending Publication Date: 2020-04-21
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The graphene nanoribbons obtained by the carbon nanotube cutting method are often too wide, generally larger than 2 nm, and cannot effectively control the edge states
[0005] Graphene nanoribbons obtained by graphite solution shearing method can be produced in large quantities, but the yield of graphene nanoribbons is extremely low, which needs to be finely screened in the later stage to be separated from graphite particles, graphene and other materials; there is also a width that is too large to be effectively controlled Borderline and other disadvantages
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Method used

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  • Preparation method of ultra-narrow graphene nanobelts

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Embodiment 1

[0033] The present embodiment provides a kind of preparation method of ultra-narrow graphene nanoribbon, such as figure 1 shown, including the following steps:

[0034] S1. Perform heat treatment on the single-walled carbon nanotubes at 350-500° C., the heat treatment time is 0.5-2 hours, and the heat treatment is carried out in an atmosphere containing oxygen;

[0035] Specifically, the atmosphere containing oxygen is an air atmosphere with a humidity of less than 80% or a mixed gas atmosphere of oxygen and argon with an oxygen content of 5% to 100%.

[0036] S2. After mixing the single-walled carbon nanotubes obtained in step S1 with the molecules used for filling, vacuum seal the tubes:

[0037] Put the single-walled carbon nanotubes with open ports obtained in step S1 into a glass tube or a quartz tube together with the molecules used for filling, and use a mechanical pump or a molecular pump to pump air into the glass tube or quartz tube until the vacuum degree reaches ...

Embodiment 2

[0043] The present embodiment provides a kind of example of the preparation method of ultra-narrow graphene nanobelt as described in embodiment 1, comprises the steps:

[0044] S1. Carry out heat treatment at 450° C. for single-walled carbon nanotubes with an average diameter of 1.3 nm. The heat treatment time is 1 hour. The heat treatment is carried out in an air atmosphere with a humidity of 56%;

[0045] S2. Pack the single-walled carbon nanotubes with opened ports obtained in step S1 into a glass tube together with the ferrocene powder, and use a molecular pump to pump air into the glass tube until the vacuum degree reaches 10 -4 When it is below Pa, the glass tube is sealed and sealed by the flame of a high-temperature spray torch.

[0046] S3. Molecular filling heat treatment: The single-walled carbon nanotubes filled with ferrocene molecules obtained in step S2 are subjected to high-temperature heat treatment at 300 ° C. The heat treatment time is 36 hours. After the he...

Embodiment 3

[0050] The present embodiment provides a kind of example of the preparation method of ultra-narrow graphene nanobelt as described in embodiment 1, comprises the steps:

[0051] S1. Carry out heat treatment at 400° C. for single-walled carbon nanotubes with an average diameter of 1.4 nm. The heat treatment time is 2 hours. The heat treatment is carried out in a mixed atmosphere with a ratio of oxygen and argon of 1:4;

[0052] S2. Pack the single-walled carbon nanotubes with opened ports obtained in step S1 into a glass tube together with Terylene powder, and use a molecular pump to pump air into the glass tube until the vacuum degree reaches 10 -5 When it is below Pa, the glass tube is sealed and sealed by the flame of a high-temperature spray torch.

[0053] S3. Molecular filling heat treatment: The single-walled carbon nanotubes filled with Terylene molecules obtained in step S2 are subjected to high-temperature heat treatment at 400°C for 72 hours. After the heat treatment ...

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Abstract

The invention discloses a preparation method of an ultra-narrow graphene nanobelt. The preparation method comprises the following steps: S1, carrying out heat treatment on a single-walled carbon nanotube to open a port; S2, mixing the single-walled carbon nanotube treated in the step S1 and molecules for filling, and performing vacuum tube sealing; S3, carrying out molecular filling heat treatment; and S4, carrying out annealing heat treatment, so that the molecules filled in the single-walled carbon nanotube are converted into graphene nanobelt. According to the invention, by using single-walled carbon nanotubes as a template, various ultra-narrow armchair type and sawtooth type graphene nanobelts are designed and synthesized by controlling the types of precursor molecules and the diameters and the chirality of the carbon nanotubes; and the method can control the width and the edge state of graphene nanobelts, can prepare a large number of ultra-narrow graphene nanobelts, and createsnecessary conditions for the application of the ultra-narrow graphene nanobelts in the semiconductor direction.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing an ultra-narrow graphene nanoribbon. Background technique [0002] Graphene is a two-dimensional material composed of carbon atoms with excellent optical, electrical, and mechanical properties. However, graphene is a semi-metal with a band gap of 0, and this characteristic of no band gap greatly limits its application in the most important semiconductor direction. In order to open the band gap, scientists have tried external means such as electromagnetic regulation, mechanical stretching, vertical superposition, chemical doping, etc. Intrinsically, when graphene is made into a quasi-one-dimensional nanoribbon structure, a band gap will be naturally introduced, And the size of the bandgap can be tuned by the width and edge states of the nanoribbons. [0003] In the past, graphene nanoribbons can be directly or indirectly prepared by cutting carbon nanotub...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/178C01B32/159
CPCC01B32/184C01B32/178C01B32/159C01B2202/10
Inventor 石磊杨国伟刘璞
Owner SUN YAT SEN UNIV
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