STM study of selenium adsorption on Au(111) surface

doi:10.1088/1674-1056/ab821d

Abstract Adsorption of chalcogen atoms on metal surfaces has attracted increasing interest for both the fundamental research and industrial applications. Here, we report a systematic study of selenium (Se) adsorption on Au(111) at varies substrate temperatures by scanning tunneling microscopy. At room temperature, small Se clusters are randomly dispersed on the surface. Increasing the temperature up to 200℃, a well-ordered lattice of Se molecules consisting of 8 Se atoms in ring-like structure is formed. Further increasing the temperature to 250℃ gives rise to the formation of Se monolayer with Au(111)-√3×√3 lattices superimposed with a quasi-hexagonal lattice. Desorption of Se atoms rather than the reaction between the Se atoms and the Au substrate occurs if further increasing the temperature. The ordered structures of selenium monolayers could serve as templates for self-assemblies and our findings in this work might provide insightful guild for the epitaxial growth of the two-dimensional transition metal dichalcogenides.

Keywords: STM adsorption selenium structure transitions

Received: 20 February 2020
Revised: 12 March 2020
Accepted manuscript online:

PACS:	68.37.Ef	(Scanning tunneling microscopy (including chemistry induced with STM))
	68.43.-h	(Chemisorption/physisorption: adsorbates on surfaces)
	74.62.-c	(Transition temperature variations, phase diagrams)

Fund: Project supported by the Direct Grant for Research of CUHK, China (Grant Nos. 4053306 and 4053348).

Corresponding Authors: Yande Que, Xudong Xiao
E-mail: ydque@phy.cuhk.edu.hk;xdxiao@phy.cuhk.edu.hk

Cite this article:

Bin Liu(刘斌), Yuan Zhuang(庄源), Yande Que(阙炎德), Chaoqiang Xu(徐超强), Xudong Xiao(肖旭东) STM study of selenium adsorption on Au(111) surface 2020 Chin. Phys. B 29 056801

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STM study of selenium adsorption on Au(111) surface

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