Preparation method of ultra-narrow graphene nanobelts

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...

AI Technical Summary

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

[0006] The surface chemical synthesis method relies on the polymerization of precursor molecules on the metal surface to prepare graphene nanoribbons, which has the disadvantages of high difficulty in synthesis, complex and demanding precursor design, certain types of graphene nanoribbons cannot be synthesized, and is not suitable for mass synthesis.

[0007] The graphene nanobelts obtained by graphene ion beam exposure and etching also have shortcomings such as too large width, unable to effectively control the edge state, and cannot be mass-produced at the same time.

Images