Platinum diselenide crystal material and preparation method thereof

Abstract

The invention discloses a platinum diselenide crystal material and a preparation method thereof. The preparation method comprises the following steps: 1) under a vacuum environment, evaporating and depositing a proper amount of high purity selenium on a metal platinum substrate; and 2) carrying out an annealing treatment, so that selenium atoms covering the surface of the substrate and platinum atoms on the substrate interact to form a two-dimensional ordered crystalline state membrane structure in a sandwich arrangement of selenium-platinum-selenium so as to obtain the platinum diselenide crystal material. The inorganic two-dimensional crystalline state material is a new member of a transitional metal disulfide compound family, expands the field of research on non-carbon based two-dimensional crystal materials, and has a wide application potential in future information electronics and apparatus development and research. According to the method disclosed by the invention, the platinum diselenide two-dimensional crystalline state material with a big area and a high quality is grown on a molecular beam epitaxial method, so that the electronic properties of the platinum diselenide crystalline state material and related applications and development are favorably researched.

Description

technical field [0001] The invention relates to a transition metal dichalcogen compound two-dimensional crystal material and a preparation method thereof, belonging to the technical field of nanometer materials. Background technique [0002] Graphene, as a classic representative of two-dimensional atomic crystal materials, has been successfully stripped from its parent graphite in 2004. Due to its unique electronic and physical properties, it has become a research hotspot that has attracted worldwide attention in the past ten years, triggering worldwide attention. There is an upsurge in the exploration and research of new two-dimensional crystal materials. The strange physical properties of graphene come from its unique electronic structure: the linear dispersion relationship near the K point in the momentum space makes its carriers can be regarded as massless Dirac fermions, which brings a series of new physical properties . Graphene's excellent physical properties such a...

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Problems solved by technology

However, graphene has its inherent flaw: the lack of energy gaps in the electronic structure

[0005] As a member of the family of transition metal dichalcogenides, it has been theoretically predicted that the electronic energy band of platinum diselenide materials has achieved a half-metal-semiconductor transition from bulk to monolayer, making it widely used in photocatalysis and other fields. However, there is no report about its experimental preparation method, especially the preparation of samples with a single layer thickness.

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