物理学报2024，Vol.73Issue(11)：57-65,9.DOI:10.7498/aps.73.20232004
Ag2Sb合金单层上多层酞菁氧钒分子的组装
Assembly of multilayer phthalocyanine vanadium oxide molecules on Ag2Sb alloy monolayer
摘要
Abstract
Fabricating ordered molecular films and further tuning their assembly behavior is important for constructing organic devices with diverse performances.By using high-resolution scanning tunneling microscopy,in this work,we demonstrate that well-organized vanadyl phthalocyanine(VOPc)films can be formed via'bottom-up'molecular self-assembly on a binary alloy Ag2Sb/Ag(111).The Ag2Sb monolayer is prepared by evaporating Sb atoms on clean Ag(111)and followed by annealing.The VOPc molecules are deposited on the Ag2Sb layer via thermal evaporation.The molecular configuration,structural and orbital characteristics of VOPc are clearly clarified at a submolecular level.It is found that initially the ordered VOPc membrane only exhibits the O-up adsorption configuration.Its square-shaped unit cell consists of five VOPc molecules where two adsorption orientations coexist with the horizontal axis of VOPc which is rotated by about 11° or 21° relative to the side of the unit cell.Due to the molecular dipole-dipole interaction,further-deposited molecules result in the assembly of the second-layer VOPc films with the O-down configuration and the square-shaped unit cell that contains only one VOPc molecule.Subsequently,due to the dipole-dipole interaction between layered molecules,following VOPc molecular layers adopt alternating O-up and O-down configurations as well as the square-shaped unit cell,similar to the case of the second layer.In addition,we find that the molecular orbitals overlap in each assembled molecular layer due to the π-π interaction which could facilitate the charge transport along the π stacking direction of VOPc.This research provides possibility to regulate the adsorption configuration and assembly behavior of functional organic molecules on metal surfaces by forming surface alloys.关键词
酞菁氧钒/扫描隧道显微镜/结构/方向Key words
vanadyl phthalocyanine/scanning tunneling microscopy/structures/orientations引用本文复制引用
李小雨,彭兰沁,赵涵,幸运,邓炎滔,于迎辉..Ag2Sb合金单层上多层酞菁氧钒分子的组装[J].物理学报,2024,73(11):57-65,9.基金项目
国家自然科学基金(批准号:21872171)和湖北省自然科学基金(批准号:2019CFB779)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.21872171)and the Natural Science Foundation of Hubei Province,China(Grant No.2019CFB779). （批准号:21872171）
