Controllable nanometer graphene cutting method

Abstract

The invention discloses a controllable nanometer graphene cutting method, and relates to graphene. An amorphous carbon nanorod deposits at the tip end of a tungsten tip to be recrystallized through afocused electron beam, or nanometer carbon onions or graphite flakes are directly attached to the tip end of the tungsten tip, and a nanometer knife is prepared; constant bias voltages are exerted onthe tungsten tip and electrodes at the two ends of a golden wire, the nanometer knife is precisely moved according to the nanometer dimension step length, and the arbitrary precise cutting is conducted on the edge of graphene step by step. Through the cutting technology, any wanted shapes and sizes can be obtained, and the cut edges are smooth. By taking electron diffraction pictures of graphene,all chiral directions can be obtained and the edges of corresponding chiral structures are cut. Fewer layers of graphene of any shapes and patterns can be cut out instead of only obtaining angle-fixededge shapes like metal particle etching. Controllable cutting is conducted on the crystal structure and chirality of the cut edges, the cut edges are quite precise and smooth, and the roughness degree is 1-2 nm or lower.

Description

technical field [0001] The invention relates to graphene, in particular to a method for controllable nano-cut graphene. Background technique [0002] Nanoscience and technology is one of the most important research fields at present. The development of nanomaterials has played a huge role in promoting the progress of science and technology. Carbon nanomaterials are a new type of nanomaterials with great development potential. In 2004, two scientists from the University of Manchester, Andre Geim and Konstantin Novoselov, used micromechanical exfoliation to separate graphene (a carbon atom with SP 2 Monoatomic layer graphite formed by hybridization). Theoretical carrier mobility of graphene at room temperature > 250000cm 2 V -1 the s -1 , coupled with its excellent properties such as force, heat, and light, makes it have broad application prospects in the fields of materials, energy, and electronics, and has attracted great research interest. [0003] It is well known ...

AI Technical Summary

Problems solved by technology

For example, electron beam lithography has poor control over the roughness and chirality of the edges of graphene trimming; carbon nanotube axial tearing lacks good control over the edge chirality; metal particle etching and electron beam-induced tearing cannot Efficient control over the shape of graphene

Images