The Adsorption Behavior And Electrical Properties Of Fe, Co And Ni Atoms On The Surface Of Single-layer Copper Selenide

Emergence of two-dimensional materials presents the new hope of science and industry.As two-dimensional atomic crystal materials,transition metal chalcogenides show excellent physical properties such as superconductivity,thermoelectric effect and charge density wave.They also show great application potential in the fields of optoelectronics,catalysis,new energy and sensors,providing a broad platform for the research and application of nanoscale devices.Similar to the monolayer twodimensional materials,the controlled synthesis and magnetic regulation of twodimensional magnetic nanomaterials are of great significance for the application of spintronic devices.In this paper,we obtained monolayer copper selenide by molecular beam epitaxy.The atomic structure and electronic properties of monolayer copper selenide were characterized by scanning tunneling microscopy and low-energy electron diffraction.The results of Bond-resolution scanning tunneling microscopy and Non-contact atomic force microscopy show that three six-membered rings are missing in the triangular pores of monolayer copper selenide,and there is a bare Cu substrate inside the nanopores.STS measurements showed that the monolayer copper selenide exhibited semiconductor properties with a band gap of 2.40 eV.We deposited Fe,Co,Ni atoms on the monolayer copper selenide surface to investigate the adsorption behavior and electronic properties.Experimental results show that Fe atoms have special selective adsorbability at the nanopores of monolayer copper selenide,forming special "w" shaped atomic clusters,Ni atoms destroyed the honeycomb lattice structure of original copper selenide and form intercalation,and Co atoms were physical adsorption on the surface of copper selenide.By exploring the adsorption behavior and electronic properties of magnetic atoms on the surface of monolayer copper selenide,the combination of monolayer two-dimensional materials and two-dimensional magnetic nanomaterials can provide support for the practical application of functional twodimensional materials.