Intrinsically patterned corrals in monolayer Ag_(5)Se_(2) and selective molecular co-adsorption  

作　　者：Jianchen Lu Shiru Song Shuai Zhang Yang Song Yun Cao Zhenyu Wang Li Huang Hongliang Lu Yu-Yang Zhang Sokrates T.Pantelides Shixuan Du Xiao Lin Hong-Jun Gao 

机构地区：[1]Institute of Physics&University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100190,China [2]Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science,Vanderbilt University,Nashville,TN 37235,USA [3]CAS Center for Excellence in Topological Quantum Computation,Chinese Academy of Sciences,Beijing 100190,China [4]Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China

出　　处：《Nano Research》2022年第7期6730-6735,共6页纳米研究（英文版）

基　　金：supported by the financial support from the National Key R&D Program of China(Nos.2018YFA0305800 and 2019YFA0308500);National Natural Science Foundation of China(Nos.61901200,61925111,61888102,and 21661132006);the Strategic Priority Research Program of Chinese Academy of Sciences(Nos.XDB30000000 and XDB28000000);the International Partnership Program of Chinese Academy of Sciences(No.112111KYSB20160061);the KC Wong Education Foundation,the Yunnan Fundamental Research Projects(Nos.2019FD041,202201AT070078,and 202101AW070010);the China Postdoctoral Science Foundation;supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,Materials Science and Engineering Division grant No.DE-FG-02-09ER46554 and by the McMinn endowment.

摘　　要：Functionalized two-dimensional(2D)materials play an important role in both fundamental sciences and practical applications.The construction and precise control of patterns at the atomic-scale are necessary for selective and multiple functionalization.Here we report the fabrication of monolayer pentasilver diselenide(Ag_(5)Se_(2)),a new type of intrinsically patterned 2D material,by direct selenization of a Ag(111)surface.The atomic arrangement is determined by a combination of scanning tunneling microscopy(STM),low-energy electron diffraction(LEED),and density-functional-theory(DFT)calculations.Large-scale STM images exhibit a quasi-periodic pattern of stoichiometric triangular domains with a side length of~15 nm and apical offsets.The boundaries between triangular domains are sub-stoichiometric.Deposition of different molecules on the patterned Ag_(5)Se_(2) exhibits selective adsorption behavior.Pentacene molecules preferentially adsorb on the boundaries,while tetracyanoquinodimethane(TCNQ)molecules adsorb both on the boundaries and the triangular domains.By co-depositing pentacene and TCNQ molecules,we successfully construct molecular corrals with pentacene on the boundaries encircling TCNQ molecules on the triangular domains.The realization of epitaxial large-scale and high-quality,monolayer Ag_(5)Se_(2) extends the family of intrinsically patterned 2D materials and provides a paradigm for dual functionalization of 2D materials.

关 键 词：two-dimensional materials dual functionalization scanning tunneling microscope epitaxial growth Ag_(5)Se_(2)monolayer 

分 类 号：TB3[一般工业技术—材料科学与工程]