A method for optical visualization of two-dimensional atomic crystal materials on substrate surfaces

Abstract

The invention provides a method for realizing optical visualization of a two-dimensional atomic crystal material on a substrate surface. According to the method, a sample to be detected, whose surface contains a two-dimensional atomic crystal material, is placed on the objective table of an optical microscope or is directly placed under a magnifying lens, then water steam is sprayed on the surface of the sample, and thus the two-dimensional atomic crystal material on the substrate surface is clearly visible under the optical microscope. Moreover, the method can also distinguish the single layer and multi-layer two-dimensional atomic crystal material areas. The method does not need pricy or complicated equipment, the operation is simple, the cost is low, the pretreatment of sample is not needed; only under the assistance of water steam, two-dimensional atomic crystal materials such as graphene can be directly observed and positioned by common optical microscope, amplifying lens, or even naked eyes; the sample surface will not be contaminated after water drops are evaporated; the subsequent operation and application are not influenced; thus the method can be performed repeatedly, the method is green and environment-friendly, and the research on two-dimensional atomic material such as graphene and manufacture of related devices become easier.

Description

technical field [0001] The invention relates to a method for directly observing two-dimensional atomic crystal materials on various substrate surfaces, especially graphene, under an ordinary optical microscope, a magnifying glass or even naked eyes, and belongs to the technical field of material characterization analysis. Background technique [0002] Nanomaterials refer to materials in which at least one dimension in three-dimensional space is in the nanoscale range (1-100nm) or composed of them as constituent units. Among them, two-dimensional materials refer to materials that electrons can move freely at the nanoscale in two dimensions. Two-dimensional materials were proposed following the successful separation of monoatomic layer graphene materials by the Geim group in the United Kingdom in 2004. Due to the outstanding characteristics of graphene, graphene has attracted great interest in both theoretical research and application fields. Subsequent other two-dimensional ...

AI Technical Summary

Problems solved by technology

However, these auxiliary molecules need to be deliberately removed or even cannot be removed, which will contaminate the surface of graphene and affect the further measurement and application of graphene.

[0006] So far, there has not been a method with strong applicability (suitable for two-dimensional atomic crystal materials on various substrate surfaces, especially graphene), strong controllability, repeatable and non-polluting methods to realize two-dimensional atomic crystal materials Direct observation under ordinary optical microscopes enables the localization, characterization and manipulation of two-dimensional atomic crystal materials

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