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Determination of the Potential Barrier at the metal／oxide interface in a Specular Spin Valve Structure with Nano—oxide Layers Using Electron Holography

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Chinese Physics Letters 2002年第10期19卷 1480-1482页

作者：王岩国沈峰等 BeijingLaboratoryofElectronMicroscopy InstituteofPhysicsandCenterforCondensedMatterPhysicsChineseAcademyofSciencesPoBox2724Beijing100080 BeijingLaboratoryofElectronMicroscopy InstituteofPhysicsandC

The local potential distribution in a specular spin valve structure with nano-oxide layers has been mapped by using off-axis electron holography in a field emission gun transmission electron microscope. A potential jump of 3-4V across the metal/oxide interface was detected for the first time. The presence of the potential barrier confirms the formation of the metal/insulator/metal structure, which contributes to the increasing mean free path of spin-polarized electrons via the specular reflection of spin-polarized electrons at the metal/oxide interface. It leads to nearly double enhancement of the magnetoresistance ratio from 8% to 15%.

关键词： Determination Potential Barrier metal/oxide interface Specular Spin Valve Structure Nano-oxide Layers Electron Holography

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Interfacial oxidized Pd species dominate catalytic hydrogenation of polar unsaturated bonds

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Nano Research 2024年第1期17卷 228-234页

作者： Pengyao You Shaoqi Zhan Pengpeng Ruan Ruixuan Qin Shiguang Mo Yazhou Zhang Kunlong Liu Lansun Zheng Nanfeng Zheng State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materialsand Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Chemistry BMCUppsala UniversityBMC Box 576Uppsala S-75123Sweden Department of Chemistry University of OxfordOxford OX13QZUK

The determination of catalytically active sites is crucial for the design of efficient and stable catalysts toward desired ***,the complexity of supported noble metal catalysts has led to controversy over the locations of catalytically active sites(e.g.,metal,support,and metal/support interface).Here we develop a structurally controllable catalyst system(Pd/SBA-15)to reveal the catalytic active sites for the selective hydrogenation of ketones to alcohol using acetophenone hydrogenation as model *** investigations demonstrated that unsupported Pd nanocrystals have no catalytic activity for acetophenone ***,oxidized Pd species were catalytically highly active for acetophenone *** catalytic activity decreased with the decreased oxidation state of *** work provides insights into the hydrogenation mechanism of ketones but also other unsaturated compounds containing polar bonds,e.g.,nitrobenzene,N-benzylidene-benzylamine,and carbon dioxide.

关键词： oxidized Pd metal/oxide interface constant particle size Pd/SBA-15 acetophenone hydrogenation

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Impact of environment gas element N on effective work function of metal/oxide stack:a first-principles study of the Pt/HfO2 interface

Impact of environment gas element N on effective work functi...

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第十三届全国物理力学学术会议

作者： Y.W.Liu D.X.Xie T.Durakiewicz X.F.Wang School of Materials Science and Engineering Xiangtan University Los Alamos National Laboratory

Modulating the effective work function(Φeff)of metal electrodes is both crucial and challenging in metal-oxide-semiconductor *** introduction of atomic dopants is proved to be an effective method to modify the interfaceΦ*** apply first principles calculations to systematically explore the impact of non-metal ambient gas element N incorporation on the effective work function of a Pt/Hf O2 interface,and find thatΦeff is really closely related to the doped atomic position and concentration.N atoms incorporated,which is favored at the interface near Hf O2 side,can increase significantly the interfaceΦeff for the Pt/Hf O2 stack(making it more p-type),and theΦeff increases with the increase of doped N concentration due to the mitigation effect of dope N on interface dipole *** finding would provide guidance to develop environment annealing approach to modulation ofΦeff of metal/oxide stack.

关键词： work function metal/oxide interface N dopant electronegativity

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Microscopic Approach of Adhesion and Wetting of Liquid metal on Solid Ionocovalent oxide Surface

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Rare metals 1993年第2期12卷 84-96页

作者：李建国 Institut fur Nichtmetallische Werkstoffe Technische Universitat BerlinEnglische Str.201000 Berlin 12FRG.

The adhesion and wetting of non-reactive liquid metals with solid ionocovalent oxides are studied on the basis of the experimental work of adhesion W data obtained with the sessile drop *** analysis of the experimental W values of different liquid metals on various solid oxides is first performed to evidence the de- pendence of the work of adhesion of a metal/oxide system on the electron density of the metal and on the thermodynamic stability of the *** electronic model is then proposed to describe the microscopic mech- anism of metal-oxide *** on the model,the contact angle and the work of adhesion of different liquid metals on various solid oxides can be interpreted and estimated,and their correlations to the various physical quantities of the oxides can be easily *** basic consideration of the model is that the adhe- sion between a metal and an oxide is assured by the electron transfer from the metal into the oxide valence band which is not completely filled of electrons at high temperatures,and is enhanced when this electron trans- fer at the metal/oxide interface is *** influence of interface defects on the wetting and adhesion is suggested and discussed.

关键词： Wetting Adhesion metal/oxide interface Electron density of metal Bandgap energy of oxide

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