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2-D Oxide Nano-Systems: Substrate Coupling and Strain Effects

来源:合肥微尺度物质科学国家实验室    浏览次数:0


报告题目   2-D Oxide Nano-Systems: Substrate Coupling and Strain Effects
报告人   Prof. Falko P. Netzer
报告人单位   Institute of Physics, Surface and Interface Physics. Karl-Franzens University, Graz, AUSTRIA
报告时间   2018-10-15   16:00
报告地点   合肥微尺度物质科学国家研究中心九楼会议室(9004)
主办单位   合肥微尺度物质科学国家研究中心
报告介绍

Abstract:
  Two-dimensional (2-D) transition metal oxide layers have attracted significant interest during the past decade due to their novel emergent properties and their high potential for nanotechnology applications [1]. For practical reasons 2-D oxide layers are usually supported on metal surfaces. This leads to a coupling of the oxide overlayer to the metal substrate, often strong coupling, which creates a metal-oxide hybrid system with properties that are largely determined by the oxide-metal interface. In this talk, I will discuss the role of the metal-oxide coupling in shaping the morphology and structure of two-dimensional oxide systems. Moreover, the effects of interfacial strain on the physical and chemical properties of 2-D oxide layers will be investigated. I will discuss 3 case studies:
1)W-oxide on Pd(100) [2], a system with strong oxide-metal coupling, leading to a commensurate overlayer with strong strain effects;
2)W-oxide on Ag(100), a system with weak oxide-metal coupling, leading to an incommensurate overlayer with virtually no strain;
3)Ce-oxide on Cu(110) [3], where the symmetry mismatch at the interface generates a spatially modulated strain field giving rise to a periodic pattern formation.
  All 2-D oxide overlayers are prepared by a PVD method and are atomically characterized experimentally in a surface science approach by STM, LEED and various electron spectrocopies, as well as theoretically by extensive DFT calculations.

[1] Oxide materials at the two-dimensional limit. F.P. Netzer and A. Fortunelli, Eds. (Springer Series in Materials Science, Vol. 234, Springer 2016)
[2] N. Doudin, D. Kuhness, M. Blatnik, G. Barcaro, F.R. Negreiros, L. Sementa, A. Fortunelli, S. Surnev, F.P. Netzer, J. Phys. Chem.C 2016, 120, 28682
[3] L. Ma,  N. Doudin, S. Surnev, G. Barcaro, L. Sementa, V. Mankad, A. Fortunelli, F.P. Netzer, J. Phys. Chem. Lett. 7(2016)1303

报告人介绍:
  Falko P. Netzer教授是国际知名的金属氧化物模型催化剂领域的专家,在包括Science在内的杂志上发表文章420余篇,H因子高达51,受邀70余次邀请报告。曾担任奥地利物理学会主席。目前是奥地利科学院院士,欧洲科学院院士,物理学会会员,美国科学促进会会士,美国真空学会会士,Surface Science编委,美国真空学会表面科学执行委员会成员,以及多个咨询委员会和评估委员会(同步辐射、欧洲研究会等)的委员。

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