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Self-organization and tunable characteristic lengths of twodimensional hexagonal superlattices of nanowires directly grown on substrates

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Nano Research 2023年第1期16卷 1606-1613页

作者： D.Yi L.Peres A.Pierrot S.Cayez R.Cours B.Warot-Fonrose C.Marcelot P.Roblin K.Soulantica T.Blon Universitéde Toulouse Laboratoire de Physique et Chimie des Nano-ObjetsUMR 5215 INSACNRSUPS135 Avenue de RangueilF-31077 Toulousecedex 4France cemes Universitéde ToulouseCNRS29 Rue Jeanne MarvigBP 94347F-31055 ToulouseFrance Laboratoire de Génie Chimique Universitéde ToulouseCNRSINPUPS ToulouseFrance

The organization of nano-objects on macroscopic surfaces is a key challenge for the technological improvement and implementation of nanotechnologies.For achieving operational functions,it is required to assemble nano-objects as controllable building blocks in highly ordered superstructures.Herein,we demonstrate the growth and self-organization of metallic nanowires on surfaces into hexagonal superlattices with tunable characteristic lengths depending of the stabilizing surfactants employed.Starting from a reacting mixture containing a Pt(111)substrate,a Co organometallic precursor,an amine,and an acid dissolved in a solvent,we quantify the structural evolution of superlattices of vertical single-crystalline Co nanowires on Pt,using a combined analysis of small angle neutron scattering,transmission,and scanning electron microscopies.We show the concerted steps of a spontaneous growth and self-organization of the nanowires into two-dimensional(2D)hexagonal lattice on Pt,at intervals starting from a few hours of reaction to a highly ordered superlattice at longer times.Furthermore,it is shown that apart from long-chain acid and long-chain aliphatic amine pairs used as stabilizers,the combination of a long-chain aliphatic and a short-chain aromatic ligand in the synthesis can also be employed for the nanowire superlattices development.Interestingly,the possibility to employ different pairs allows quantitative modulation of the nanowire arrays,such as the interwire distance and the packing fraction.

关键词： metallic nanowire array self-assembly self-organized growth Co nanowire anisotropic growth solution epitaxial growth

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Control of light emission of quantum emitters coupled to silicon nanoantenna using cylindrical vector beams

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Light(Science & Applications) 2023年第10期12卷 2248-2255页

作者： Martin Montagnac Yoann Brûlé Aurélien Cuche Jean-Marie Poumirol Sébastien J.Weber Jonas Müller Guilhem Larrieu Vincent Larrey Franck Fournel Olivier Boisron Bruno Masenelli Gérard Colas des Francs Gonzague Agez Vincent Paillard cemes-cnrs Universitéde ToulouseToulouseFrance ICB Universitéde BourgogneCNRSDijonFrance LAAS-cnrs Universitéde ToulouseToulouseFrance CEA-LETI UniversitéGrenoble-AlpesGrenobleFrance Universitéde Lyon UniversitéLyon 1CNRS UMR 5510ILMVilleurbanneFrance Universitéde Lyon INSA LyonCNRSEcole Centrale de LyonUniversitéLyon 1CPEUMR 5270INLVilleurbanneFrance Bruno Masenelli

Light emission of europium(Eu^(3+))ions placed in the vicinity of optically resonant nanoantennas is usually controlled by tailoring the local density of photon states(LDOS).We show that the polarization and shape of the excitation beam can also be used to manipulate light emission,as azimuthally or radially polarized cylindrical vector beam offers to spatially shape the electric and magnetic fields,in addition to the effect of silicon nanorings(Si-NRs)used as nanoantennas.The photoluminescence(PL)mappings of the Eu^(3+)transitions and the Si phonon mappings are strongly dependent of both the excitation beam and the Si-NR dimensions.The experimental results of Raman scattering and photoluminescence are confirmed by numerical simulations of the near-field intensity in the Si nanoantenna and in the Eu^(3+)-doped film,respectively.The branching ratios obtained from the experimental PL maps also reveal a redistribution of the electric and magnetic emission channels.Our results show that it could be possible to spatially control both electric and magnetic dipolar emission of Eu^(3+)ions by switching the laser beam polarization,hence the near field at the excitation wavelength,and the electric and magnetic LDOS at the emission wavelength.This paves the way for optimized geometries taking advantage of both excitation and emission processes.

关键词： excitation cylindrical spatially

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Conductance of a single molecule C_(60)-SnPc heterojunction

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Chinese Chemical Letters 2022年第2期33卷 1074-1076页

作者： Yifan Wang Mingjun Zhong Jie Li Hao Tang Richard Berndt Yajie Zhang Shimin Hou Yongfeng Wang Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics Department of ElectronicsPeking UniversityBeijing 100871China cemes-cnrs Boîte Postale 94347Toulouse 31055France Institut für Experimentelle und Angewandte Physik Christian-Albrechts-Universität zu KielKiel D-24098Germany Beijing Academy of Quantum Information Sciences Beijing 100193China Institute of Spin Science and Technology South China University of TechnologyGuangzhou 511442China

Geometries of molecule-molecule interfaces strongly influence the current passing from one molecule to another. The contact conductance of molecule-molecule junctions which consist of fullerene and tin phthalocyanine molecules is investigated with a low-temperature scanning tunneling microscope. Two types of molecules are deposited onto Cu(111). Fullerene molecules are transferred to tips through controlled contact of STM tips on molecules. The molecule-molecule junctions are formed by approaching fullereneterminated tips to tin phthalocyanine molecules on Cu(111). Our experimental method can be extended to study the intermolecular charge transport of a range of molecular junctions.

关键词： Single-molecule electronics Switch C_(60) Phthalocyanine STM

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Deep learning in nano-photonics:inverse design and beyond

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Photonics Research 2021年第5期9卷 I0015-I0033页

作者： PETER R.WIECHA ARNAUD ARBOUET CHRISTIAN GIRARD OTTO L.MUSKENS LAAS Universitéde ToulouseCNRSToulouseFrance cemes Universitéde ToulouseCNRSToulouseFrance Physics and Astronomy Faculty of Engineering and Physical SciencesUniversity of SouthamptonSouthamptonUK

Deep learning in the context of nano-photonics is mostly discussed in terms of its potential for inverse design of photonic devices or nano-structures. Many of the recent works on machine-learning inverse design are highly specific, and the drawbacks of the respective approaches are often not immediately clear. In this review we want therefore to provide a critical review on the capabilities of deep learning for inverse design and the progress which has been made so far. We classify the different deep-learning-based inverse design approaches at a higher level as well as by the context of their respective applications and critically discuss their strengths and weaknesses. While a significant part of the community’s attention lies on nano-photonic inverse design, deep learning has evolved as a tool for a large variety of applications. The second part of the review will focus therefore on machine learning research in nano-photonics "beyond inverse design." This spans from physics-informed neural networks for tremendous acceleration of photonics simulations, over sparse data reconstruction, imaging and "knowledge discovery" to experimental applications.

关键词： inverse beyond learning

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Synthesis of (B-C-N) Nanomaterials by Arc Discharge Using Heterogeneous Anodes

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Plasma Science and Technology 2016年第5期18卷 465-468页

作者： Djamel Eddine GOURARI Manitra RAZAFINIMANANA Marc MONTHIOUX Raul ARENAL Flavien VALENSI Sebastien JOULIE Virginie SERIN LAPLACE (Laboratoire Plasma et Conversion d'Energie) CNRS-INPT-Universite Toulouse III 118 Route de Narbonne 31062 Toulouse Cedex 9 France cemes (Centre d'Elaboration des Materiaux et d'Etudes Structurales) CNRS-Universite Toulouse III 29 rue Jeanne Marvig F-31055 Toulouse Cedex 4 France Instituto de Nanociencia de Aragon (INA) Universidad de Zaragoza Calle Mariano Esquillor 50018 Zaragoza Spain

In spite of the current prevalence of the CVD-based processes, the electric arc remains an interesting process for the synthesis of carbon nanoforms, thanks to its versatility, robustness and easiness. It also allows performing in-situ substitution of carbon atoms by hetero-elements in the graphene lattice. Our work aims to establish a correlation between the plasma properties, type and chemical composition （and the substitution rate） of the obtained single-wall carbon nan- otubes. The plasma was characterized by optical emission spectroscopy and the products were analyzed by high resolution transmission electron microscopy and core level Electron Energy-Loss Spectroscopy （EELS）. Results show that a high boron content leads to a plasma temperature decrease and hinders the formation of nanotubes. This effect can be compensated by increasing the arc current and/or yttrium content. The optimal conditions for the synthesis of boron- and/or nitrogen-substituted nanotubes correspond to a high axial plasma temperature associated to a strong radial gradient. EELS analysis confirmed that the boron incorporates into the graphenic lattice.

关键词： arc discharge plasma nanomaterials synthesis optical spectroscopy boronnitride doped carbon nanotubes HRTEM EELS

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STM Manipulation of Molecular Moulds on Metal Surfaces

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Nano Research 2009年第3期2卷 254-259页

作者： Miao Yu Wei Xu Youness Benjalal Regis Barattin Erik Lægsgaard Ivan Stensgaard Mohamed Hliwa Xavier Bouju AndréGourdon Christian Joachim Trolle R.Linderoth Flemming Besenbacher Interdisciplinary Nanoscience Center(iNANO)and Department of Physics and Astronomy Aarhus UniversityNy Munkegade8000 Aarhus CDenmark Nanoscience group CEMES-CNRS29 rue Jeanne Marvig31055 ToulouseFrance Facultédes Sciences Ben MʼSik UniversitéHassan II-MohammédiaBP 7955Sidi OthmanCasablancaMorocco

Molecular Landers are a class of compounds containing an aromatic board as well as bulky side groups which upon adsorption of the molecule on a surface may lift the molecular board away from the substrate.Different molecular Landers have extensively been studied as model systems for nanomachines and the formation of molecular wires,as well as for their function as“molecular moulds”,i.e.,acting as templates by accommodating metal atoms underneath their aromatic board.Here,we investigate the adsorption of a novel Lander molecule 1,4-bis(4-(2,4-diaminotriazine)phenyl)-2,3,5,6-tetrakis(4-tert-butylphenyl)benzene(DAT,C_(64)H_(68)N_(10))on Cu(110)and Au(111)surfaces under ultrahigh vacuum(UHV)conditions.By means of scanning tunneling microscopy(STM)imaging and manipulation,we characterize the morphology and binding geometries of DAT molecules at terraces and step edges.On the Cu(110)surface,various contact configurations of individual DAT Landers were formed at the step edges in a controlled manner,steered by STM manipulation,including lateral translation,rotation,and pushing molecules to an upper terrace.The diffusion barrier of single DAT molecules on Au(111)is considerably smaller than on Cu(110).The DAT Lander is specially designed with diamino-triazine side groups making it suitable for future studies of molecular self-assembly by hydrogen-bonding interactions.The results presented here are an important guide to the choice of substrate for future studies using this compound.

关键词： Scanning tunneling microscopy(STM) molecular Landers adsorption STM manipulation molecular moulding

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Sierpiński-triangle fractal crystals with the C_(3v)point group

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Chinese Chemical Letters 2015年第10期26卷 1198-1202页

作者： Na Li Xue Zhang Gao-Chen Gu Hao Wang Damian Nieckarz Pawel Szabelski Yang He Yu Wang Jing-Tao Lü Hao Tang Lian-Mao Peng Shi-Min Hou Kai Wu Yong-Feng Wang Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking University Department of Theoretical Chemistry Miria-Curie Sktodowska University School of Physics Huazhong University of Science and Technology Beida Information Research(BIR) Groupe Matériaux Crystallins sous Contrainte CEMES-CNRSBoite Postale 9434731055 ToulouseFrance BNLMS College of Chemistry and Molecular EngineeringPeking University

Self-similar fractals are of importance in both science and engineering. Metal-organic Sierpin′ ski triangles are particularly attractive for applications in gas separation, catalysis and sensing. Such fractals are constructed in this study by using 1208 V-shaped 4,400-dicyano-1,10：30,100-terphenyl molecules and Fe atoms on Au（1 1 1）, and studied in detail by low-temperature scanning tunneling microscopy. Density functional theory calculations are employed to rationalize the invisible Fe atoms in STM images. Monte Carlo simulations are performed to understand the formation mechanism of the surface-supported fractal crystals.

关键词： STM MOF Fractal Sierpiń ski triangle

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Synthesis of NaYF_(4):20% Yb^(3+),2% Er^(3+),2% Ce^(3+)@NaYF_(4) nanorods and their size dependent uptake efficiency under flow condition

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Journal of Rare Earths 2022年第10期40卷 1519-1526页

作者： Dongmei Qiu Jie Hu Peiyuan Wang Decai Huang Yaling Lin Haina Tian Xiaodong Yi Qilin Zou Haomiao Zhu Fujian Normal University Fuzhou350007China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen361021China College of Materials Science and Engineering Huaqiao UniversityXiamen 361021China Research Center of Biomedical Engineering of Xiamen&Key Laboratory of Biomedical Engineering of Fujian Province&Fujian Provincial Key Laboratory for Soft Functional Materials Research Department of BiomaterialsCollege of MaterialsXiamen UniversityXiamen 361005China Centre D’Elaboration de Mat eriaux et D’Etudes Structurales(cemes) CNRSUniversit e de Toulouse-UPS29 Rue Jeanne MarvigBP 9434731055ToulouseCedex 4France

Lanthanide doped fluorescent nanoparticles have gained considerable attention in biomedical applications.However,the low uptake efficiency of nanoparticles by cells has limited their applications.In this work,we demonstrate how the uptake efficiency is affected by the size of nanoparticles under flow conditions.Using the same size NaYF_(4):20%Yb^(3+),2%Er^(3+),2%Ce^(3+)(the contents of rare earths elements are in molar fraction)nanoparticles as core,NaYF_(4):20%Yb^(3+),2%Er^(3+),2%Ce^(3+)@NaYF_(4) core-shell structured nanorods(NRs)with different sizes of 60-224 nm were synthesized by thermal decomposition and hot injection method.Under excitation at 980 nm,a strong upconversion green emission(541 nm,^(2)H_(11/2)→^(4) I_(15/2) of Er^(3+))is observed for all samples.The emission intensity for each size nanorod was calibrated and is found to depend on the width of NRs.Under flow conditions,the nanorods with 96 nm show a maximum uptake efficiency by endothelial cells.This work demonstrates the importance of optimizing the size for improving the uptake efficiency of lanthanide-doped nanoparticles.

关键词： Uptake efficiency Endothelial cells Upconversion luminescence Cell imaging Rare earths

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In situ electron holography of the dynamic magnetic field emanating from a hard-disk drive writer

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Nano Research 2015年第4期8卷 1241-1249页

作者： Joshua F. Einsle Christophe Gatel Aurelien Masseboeuf Robin Cours Muhammad A. Bashir Mark Gubbins Robert M. Bowman Etienne Snoeck Centre for Nanostructured Media School of Mathematics and Physics Queen's University Belfast Belfast BT7 1NN UK cemes-cnrs 29 rueJ. Marvig 31055 Toulouse France Universite de Toulouse Paul Sabatier 118 route de Narbonne 31062 Toulouse Cedex 9 France Seagate Technology I Disc Drive Springtown Industrial Estate Derry City Co. BT48 OBF Londonderry UK

在经由云存取数据的社会的移动设备的增长在在在服务器使用的硬盘驱动器 HDD 上要存储的信息的数量正在强加戏剧的增加。预报是密度将需要由差不多 35% 复合每年并且由 2,020 云存储能力增加的那 areal 将在相应于 2 Tb/in 的 areal 密... 详细信息

在经由云存取数据的社会的移动设备的增长在在在服务器使用的硬盘驱动器 HDD 上要存储的信息的数量正在强加戏剧的增加。预报是密度将需要由差不多 35% 复合每年并且由 2,020 云存储能力增加的那 areal 将在相应于 2 Tb/in 的 areal 密度的 7 zettabytes 附近 2 。这在 HDD 在读 / 写的头从电磁的作家的磁性的杆要求增加的性能。写的当前的 state-of-art 被潜水艇 100 nm 尺寸的词法上复杂的磁性的杆承担，在设计的磁性的盾的环境，它需要在 50 nm 附近在记录媒介上把强壮的方向性的磁场送到区域吗？？

关键词：原位透射电镜硬盘驱动器动态磁场电子全息写入器纳米尺寸存储能力移动设备

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Large Room Temperature Magneto-Resistance in Magnetically Disordered Fe1.5Ti0.5O3-δThin Films

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World Journal of Condensed Matter Physics 2014年第4期4卷 250-261页

作者： Ekaterine Chikoidze Yves Dumont Elena Popova Niels Keller Andrey Shumilin Veniamin Kozub Benedicte Warot-Fonrose Groupe d’Etudes de la Matière Condensée (GEMaC) Université de Versailles St-Quentin en Yvelines—CNRS Versailles France A. F. IoffePhysico-Technical Institute Russian Academy of Sciences St. Peterbourg Russia cemes-cnrs Toulouse France

Electronic transport properties of magnetically disordered R(-3)c phase Fe1.5Ti0.5O3-δ thin films epitaxially grown on Al2O3(0001) substrates have been studied. The measured magnetization in configurations with the magnetic field perpendicular and parallel to the film plane shows weak values of 0.1μB/formula compared to the theoretical value of 2μB/formula and a strong anisotropy with no saturation in perpendicular configuration. These properties are associated with the ato- mic scale disorder of Ti/Fe ions along c-axis. At zero-magnetic field and within the temperature range of 80 K to 400 K, the conduction mechanism appears to be Efros-Shklovskii variable range hopping with a carrier localization length of ξ0= 0.86nm. Magneto-resistance (MR) is positive in perpendicular configuration, while it is negative in parallel configuration, with significant values of MR = 27%- 37% at room temperature at 9 Tesla. Electron localization lengths were deduced from experiment for different external magnetic fields. The origin of magneto-resistance observed in experiment, is discussed.

关键词： PACS Numbers: 73.50.-h. Transport Processes in Thin Films 72.20.Ee Hopping Transport 75.47.Lx Magnetic Oxides 75.70.Ak Magnetic Properties of Monolayers and Thin Films

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