检索结果-南通市图书馆

InN/InGaN quantum dot electrochemical devices:new solutions for energy and health

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

National Science Review 2017年第2期4卷 184-195页

作者： Richard Ntzel South China Academy of Advanced Optoelectronics South China Normal University L-NESS and dipartimento di scienza dei materiali Università di Milano-Bicocca

A review is given of the exceptional electrochemical performance of epitaxial InN/InGaN quantum dots(QDs) as photoelectrodes for solar hydrogen generation by water spliting, as biosensor transducers and as anion-selective electrodes, and they are also evaluated as supercapacitor electrodes. he performance is benchmarked against the best performances of other reported materials and nanostructures. A model based on the unique interplay of surface and quantum properties is put forward to understand the boost of catalytic activity and anion selectivity interlinking quantum nanostructure physics with electrochemistry and catalysis. Of equal impact is the direct growth on cheap Si substrates without any bufer layers, allowing novel device designs and integration with Si technology. his makes the InN/InGaN QDs viable, opening up new application ields for Ⅲ-nitride semiconductors.

关键词： quantum dot solar hydrogen biosensor ion-selective electrode supercapacitor InN InGaN

A Few Questions about Single-Atom Catalysts:When Modeling Helps

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Accounts of Materials Research 2022年第9期3卷 986-995页

作者： Giovanni di Liberto Sergio Tosoni Luis A.Cipriano Gianfranco Pacchioni dipartimento di scienza dei materiali Universitàdi Milano-Bicocca20125 MilanoItaly

CONSPECTUS:Single-atom catalysis(SAC)is a fascinating and rapidly growing field in heterogeneous *** less than 20 years,this has become one of the most widely investigated subjects by the catalytic community for various good reasons:the ability to synthesize active catalysts using a minimum amount of precious metals,the expected higher selectivity of SACs compared to assemblies of nanoparticles of variable sizes,and the fact that SACs represent a bridge between homogeneous and heterogeneous catalysis.

关键词： catalysis catalysis sizes

Microscopic insight into the single step growth of in-plane heterostructures between graphene and hexagonal boron nitride

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2019年第3期12卷 675-682页

作者： Thanh Hai Nguyen Daniele Perilli Mattia Cattelan Hongsheng Liu Francesco Sedona Neil A. Fox Cristiana di Valentin Stefano Agnoli Department of Chemical Science University of Padova Via Francesco Marzolo 1 35131 Padova Ita dipartimento di scienza dei materiali Universita di Milano-Bicocca via R. Cozzi 55 20125 Milano Italy School of Chemistry University of Bristol Cantocks Close Bristol BS81TS UK

Graphene-h-BN hybrid nanostructures are grown in one step on the Pt(111) surface by ultra-high vacuum chemical vapor deposition using a single precursor,the dimethylamino borane *** varying the deposition conditions,different nanostructures ranging from a fully continuous hybrid monolayer to well-separated Janus nanodots can be *** growth starts with heterogeneous nucleation on morphological defects such as Pt step edges and proceeds by the addition of small clusters formed by the decomposition of the dimethylamino borane *** tunneling microscopy measurements indicate that a sharp zigzag in-plane boundary is formed when graphene grows aligned with the Pt substrate and consequently with the h-BN layer as *** graphene is rotated by 30°,the graphene armchair edges are seamlessly connected to h-BN zigzag *** is confirmed by a thorough density functional theory (DFT) *** resolved photoemission spectroscopy (ARPES) data suggests that both h-BN and graphene present the typical electronic structure of self-standing non-interacting materials.

关键词： graphene h-BN heterostructures seanning tunneling microscopy density functional theory (DFT)

ALD growth of ultra-thin Co layers on the topological insulator Sb2Te3

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第2期13卷 570-575页

作者： Emanuele Longo Roberto Mantovan Raimondo Cecchini Michael D.Overbeek Massimo Longo Giovanna Trevisi Laura Lazzarini Graziella Tallarida Marco Fanciulli Charles H.Winter Claudia Wiemer CNR-IMM Unit of Agrate BrianzaVia C.Olivetti 2Agrate Brianza(MB)20864Italy Universitàdegli Studi di milano-bicocca Dipartimento di Scienza dei MaterialiVia R.Cozzi 55Milano 20125Italy Department of chemistry Wayne State UniversityDetroitMichigan 48202USA CNR-IMEM Parco Area delle Scienze 37/AParma 43124Italy

Taking the full advantage of the conformal growth characterizing atomic layer deposition(ALD),the possibility to grow Co thin films,with thickness from several tens down to few nanometers on top of a granular topological insulator(TI)Sb2Tes film,exhibiting a quite high surface roughness(2-5 nm),was *** study the Co growth on the Sb2Tes substrate,we performed simultaneous Co depositions also on sputtered Pt substrates for *** conducted a thorough chemical-structural characterization of the Co/Sb2Tes and Co/Pt heterostructures,confirming for both cases,not only an excellent conformality,but also the structural continuity of the Co layers.X-ray diffraction(XRD)and high-resolution transmission electron microscope(HRTEM)analyses evidenced that Co on Sb2Te3 grows preferentially oriented along the[0oe]direction,following the underlying rhombohedric ***,Co crystallizes in a cubic phase oriented along the[111]direction when deposited on *** work shows that,in case of deposition of crystalline materials,the ALD surface selectivity and conformality can be extended to the definition of local epitaxy,where in-plane ordering of the crystal structure and mosaicity of the developed crystallized grains are dictated by the underlying ***,a highly sharp and chemically-pure Co/Sb2Tes interface was evidenced,which is promising for the application of this growth process for spintronics.

关键词： atomic layer deposition X-ray diffraction Co-fcc Co-hep antimony telluride metal organic chemical vapor deposition spintronics

高组分稀磁半导体Cd_(1 -x)Mn_xTe/CdTe超晶格的光调制反射谱研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

红外与毫米波学报 2002年第5期21卷 332-336页

作者：陈辰嘉王学忠梁晓甘李海涛凌震王迅 V Bellani M Geddo A Stella S Tavazzi A Borghesi A Sassella 北京大学物理系北京100871 复旦大学应用表面物理实验室上海200433 infm-dipartimento di Fisica"A.Volta"dell’Universitiy di pavia infm-dipartimento di scienza dei materiali university di milano bicocca milanoitaly20125

报道用分子束外延 (MEB)技术生长的x =0 4 ,0 8的高组分稀磁半导体Cd1-xMnxTe/CdTe超晶格的光调制反射谱在室温和液氮下的实验结果 .观测到 11H ,2 2H ,33H和 11L等激子跃迁结构 ,计及子能级的量子限定效应和晶格失配导致的应力效应 ... 详细信息

报道用分子束外延 (MEB)技术生长的x =0 4 ,0 8的高组分稀磁半导体Cd1-xMnxTe/CdTe超晶格的光调制反射谱在室温和液氮下的实验结果 .观测到 11H ,2 2H ,33H和 11L等激子跃迁结构 ,计及子能级的量子限定效应和晶格失配导致的应力效应 ,对子能级结构进行了计算 ,除x =0 8样品的 33H能量计算值与实验值有较大偏差外 ,实验结果与理论符合得很好 .还与光致发光谱实验结果进行了比较 .

关键词：光调制反射激子跃迁应力效应超晶格

Size-dependent dissociation of small cobalt clusters on ultrathin NaCI films

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第5期10卷 1832-1839页

作者： Zhe Li Hsin-Yi Tiffany Chen Koen Schouteden Thomas Picot Arnaud Hillion Gianfranco Pacchioni Chris Van Haesendonck Ewald Janssens Peter Lievens Laboratory of Solid-State Physics and Magnetism KU Leuven BE-3001 Leuven Belgium Key Laboratory of Materials Modification by Laser Ion and Electron Beams Ministry of Education Dalian University of Technology Dalian 116024 China Department of Engineering and System Science "National Tsing Hua University" Hsinchu 30013 Taiwan China dipartimen to di scienza dei materiali Universita di Milano-Bicocca 1-20125 Milano Italy

Mass-selected anionic cobalt clusters of two different sizes （Co2 and Co13） were deposited onto ultrathin NaC1 films grown on an Au（111） substrate. Using scanning tunneling microscopy experiments and density functional theory simulations, we show that the deposited Co2 cluster dissociates and that the resulting Co atoms dope the NaCI surface by substituting Na ions. In contrast, the larger Co13 cluster does not dissociate and remains stable on top of the NaC1 film. The size- dependent fragmentation of clusters is an important aspect in the understanding of the chemical interaction between size-selected small aggregates of atoms and supporting surfaces.

关键词： cobalt clusters mass selection size-dependentfragmentation scanning tunnelingmicroscopy density functional theory

Intrinsic and Extrinsic Exciton Recombination Pathways in AgInS_(2)Colloidal Nanocrystals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy Material Advances 2021年第1期2021卷 165-174页

作者： Matteo L.Zaffalon Valerio Pinchetti Andrea Camellini Sergey Vikulov Chiara Capitani Bing Bai Meng Xu Francesco Meinardi Jiatao Zhang Liberato Manna Margherita Zavelani-Rossi Scott A.Crooker Sergio Brovelli dipartimento di scienza dei materiali Universitàdegli studi di Milano-Bicoccavia Roberto Cozzi 5520125 MilanoItaly dipartimento di Energia Politecnico di MilanoVia Ponzio 34/320133 MilanoItaly Istituto Italiano di Tecnologia Via Morego 3016163 GenovaItaly Glass to Power SpA Via Fortunato Zeni 838068 RoveretoItaly Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China IFN-CNR Piazza Leonardo da Vinci 3220133 MilanoItaly National High Magnetic Field Laboratory Los Alamos National LaboratoryLos AlamosNew Mexico 87545USA

Ternary I-III-VI2 nanocrystals(NCs),such as AgInS_(2) and CuInS_(2),are garnering interest as heavy-metal-free materials for photovoltaics,luminescent solar concentrators,LEDs,and *** origin of the emission and absorption properties in this class of NCs is still a subject of *** theoretical and experimental studies revealed that the characteristic Stokesshifted and long-lived luminescence of stoichiometric CuInS_(2) NCs arises from the detailed structure of the valence band featuring two sublevels with different *** same valence band substructure is predicted to occur in AgInS_(2) NCs,yet no experimental confirmation is available to ***,we use complementary spectroscopic,spectro-electrochemical,and magneto-optical investigations as a function of temperature to investigate the band structure and the excitonic recombination mechanisms in stoichiometric AgInS_(2) *** transmission measurements reveal the signatures of two subbands with opposite parity,and photoluminescence studies at cryogenic temperatures evidence a dark state emission due to enhanced exchange interaction,consistent with the behavior of stoichiometric CuInS_(2) *** the temperature as well as applying reducing electrochemical potentials further suppress electron trapping,which represents the main nonradiative channel for exciton decay,leading to nearly 100%emission efficiency.

关键词： parity valence applying

Efficient hexane isomers separation in isoreticular bipyrazolate metal-organic frameworks:The role of pore functionalization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第2期14卷 532-540页

作者： Rebecca Vismara Corrado di Nicola Rodrigo Gil-San Millan Kostiantyn V.Domasevich Claudio Pettinari Jorge A.R.Navarro Simona Galli dipartimento di scienza e Alta Tecnologiay university delVInsubria 22100 ComoItaly School of Science and Technology University ofCamerino62032 Camerino(MC)Italy Departamento de Quimica Inorganica Universidad de Granada18071 GranadaSpain Taras Shevchenko National university of Kyiv 01601 KyivUkraine School of Pharmacy University of Camerino62032 Camerino(MC)Italy Istituto di Chimica dei Composti Organometallici(ICCOM-CNR) 50019 Sesto FiorentinoItaly Consorzio Interuniversitario Nazionale per la scienza e Tecnologia dei materiali 50121 FirenzeItaly Department of Chemistry University of LiverpoolLiverpool L73NYUK

Hydrocarbons separation in petrochemical industries is a key,energy-consuming stage in the manufacture of high-quality added-value products—hence the need for more efficient materials and environmentally friendly methodologies to improve this *** this context,we have studied the effect of metal-organic frameworks(MOFs)pore functionalization in hexane isomers separation,isolating the robust isoreticular zinc(ll)bipyrazolates Zn(BPZ),showing no pore decoration,Zn(Me_(2)BPZ),the pores of which are decorated with apolar methyl groups,and Zn(BPZ(NH_(2))_(2)),the spacers of which possess polar Lewis-basic functions(H_(2)BPZ=1H,1'H-4,4'-bipyrazole;H_(2)Me_(2)BPZ=3,3'-dimethyl-1H,1'H-4,4'-bipyrazole;H_(2)BPZ(NH_(2))_(2)=3,5-diamino-1H,1'H-4,4'-bipyrazole;DMF=dimethylformamide).After characterizing Zn(BPZ(NH_(2))_(2))as per its crystal structure and thermal behaviour,and all the three MOFs as per their textural properties,we investigated,from the experimental and computational points of view,the impact of the square one-dimensional channels decoration on the separation of the hexane isomers,demonstrating the relevance of pore constrictions in the resolution of the title alkanes mixture.

关键词： adsorption molecular sieving nitrogen-donor ligands gas separation pow der diffraction variable-tem perature pulse gas chromatography

Screw dislocation structure and mobility in body centered cubic Fe predicted by a Gaussian Approximation Potential

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2018年第1期4卷 90-96页

作者： Francesco Maresca Daniele Dragoni Gábor Csányi Nicola Marzari William A.Curtin Laboratory for Multiscale Mechanics Modeling(LAMMM) Institute of Mechanical EngineeringÉcole Polytechnique Fédérale de LausanneLausanne CH-1015Switzerland Theory and Simulation of Materials(THEOS) and National Centre for Computational Design and Discovery of Novel Materials(NCCR MARVEL)École Polytechnique Fédérale de LausanneLausanne CH-1015Switzerland dipartimento di scienza dei materiali Universitàdi Milano-BicoccaVia R.Cozzi 55Milan I-20125Italy Department of Engineering University of CambridgeTrumpington StreetCambridge CB21PZUK

The plastic flow behavior of bcc transition metals up to moderate temperatures is dominated by the thermally activated glide of screw dislocations,which in turn is determined by the atomic-scale screw dislocation core structure and the associated kink-pair nucleation mechanism for *** complex plasticity phenomena requires the simulation of many atoms and interacting dislocations and *** sizes are beyond the scope of first-principles methods and thus require empirical interatomic *** for the technological important case of bcc Fe,existing empirical interatomic potentials yield spurious ***,the structure and motion of the screw dislocations in Fe are studied using a new Gaussian Approximation Potential(GAP)for bcc Fe,which has been shown to reproduce the potential energy surface predicted by density-functional theory(DFT)and many associated *** Fe GAP predicts a compact,non-degenerate core structure,a single-hump Peierls potential,and glide on{110},consistent with DFT *** thermally activated motion at finite temperatures occurs by the expected kink-pair nucleation and propagation *** stress-dependent enthalpy barrier for screw motion,computed using the nudgedelastic-band method,follows closely a form predicted by standard theories with a zero-stress barrier of~1 eV,close to the experimental value of 0.84 eV,and a Peierls stress of~2 GPa consistent with DFT predictions of the Peierls potential.

关键词： structure dislocation cubic