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Lifting surface reconstruction of Au(100)by tellurium adsorption

Nano Research 2023年第5期16卷 6967-6973页

作者： Erwen Zhang Huan Lu Wei Zhang Shuiyan Cao Yang Wang Rong Rong Ying Liu Zhuhua Zhang Ming Yang Yanpeng Liu Wanlin Guo Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical StructuresInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China College of Jincheng Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomHong KongChina

The Au(100)surface has been a subject of intense studies due to excellent catalytic activities and its model character for surface science.However,the spontaneous surface reconstruction buries active Au(100)plane and limits practical applications,how to controllably eliminate the surface reconstruction over large scale remains challenging.Here,we experimentally and theoretically demonstrate that simple decoration of the Au(100)surface by tellurium(Te)atoms can uniquely lift its reconstruction over large scale.Scanning tunneling microscopy imaging reveals that the lifting of surface reconstruction preferentially starts from the boundaries of distinct domains and then extends progressively into the domains with the reconstruction rows perpendicular to the boundaries,leaving a Au(100)-(1×1)surface behind.The Au(100)-(1×1)is saturated at~84%±2%with respect to the whole surface at a Te coverage of 0.16 monolayer.With further increasing the Te coverage to 0.25 monolayer,the Au(100)-(1×1)surface becomes reduced and overlapped by a well-ordered(2×2)-Te superstructure.No similar behavior is found for Te-decorated Au(111),Cu(111),Cu(100)surfaces,nor for the decorated Au(100)with other elements.This result may pave the way to design Au-based catalysts and,as an intermediate step,even potentially open a new route to constructing complex transition metal dichalcogenides.

关键词： surface reconstruction of Au(100) tellurium facet-dependence adsorption energy anisotropy

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facet-dependent electro-optical properties of cholesteric liquid crystals doped with Cu2O nanocrystals

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Nano Research 2018年第9期11卷 4836-4845页

作者： Dongyu Zhao Lihong Xu Yang Shang Xiaoxia Li Lin Guo Key Laboratory of Bio-lnspired Smart Interfacial Science and Technology Ministry of Education School of Chemistry Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing 100191 China Key Laboratory of Micro-Nano Measurement-Manipulation and Physics Ministry of Education School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China

Excellent electro-optical （E-O） performances are essential for high-quality reflective cholesteric liquid crystal （LC） displays, but are often limited by the high driving voltages required by these displays. Dispersing functional nanomaterials into the LCs has emerged as a promising approach to achieve outstanding E-O properties. In this work, we report the facet-controlled E-O properties of a chiral nematic LC （N＊LC） doped with cubic, octahedral, and rhornbic dodecahedral Cu20. The outstanding E-O properties of the doped systems are related to the interaction between the liquid crystals and Cu20 dopants with different exposed crystal planes. Doping with octahedral and rhombic dodecahedral Cu20 reduces the stability of the planar state, as a result of both the surface abundance of active Cu atoms that interact with the polarized LC molecules, and the large amounts of vertexes and edges on the crystal surfaces, which accelerate the transition from the planar to the focal conic state under an applied electric field. Rhombic Cu20 is the most effective dopant for improving the E-O properties of the present LCs, resulting in a 65.31% reduction of the threshold voltage. The facet and morphology effects highlighted in this work provide a new pathway to develop excellent energy-saving meso-materials with exposed high-reactivity facets, improving their potential applications in electro-optical technologies and information displays.

关键词： Cu2O nanocrystals liquid crystals electro-optical properties host-guest systems facet-dependence

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