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978 results on '"Center for Integrated Nanotechnologies"'

1. Advanced microelectromechanical systems-based nanomechanical testing: Beyond stress and strain measurements

Author

UCL - SST/IMMC/IMAP - Materials and process engineering, Bruker Nano Inc. - n/a, Northwestern University - McCormick School of Engineering and Applied Sciences, Center for Integrated Nanotechnologies - n/a, Georgia Institute of Technology - Woodruff School of Mechanical Engineering, Bhowmick, Sanjit, Espinosa, Horacio, Jungjohann, Katherine, Pardoen, Thomas, Pierron, Olivier, UCL - SST/IMMC/IMAP - Materials and process engineering, Bruker Nano Inc. - n/a, Northwestern University - McCormick School of Engineering and Applied Sciences, Center for Integrated Nanotechnologies - n/a, Georgia Institute of Technology - Woodruff School of Mechanical Engineering, Bhowmick, Sanjit, Espinosa, Horacio, Jungjohann, Katherine, Pardoen, Thomas, and Pierron, Olivier

Abstract

The fi eld of in situ nanomechanics is greatly benefi ting from microelectromechanical systems (MEMS) technology and integrated microscale testing machines that can measure a wide range of mechanical properties at nanometer scales, while characterizing the damage or microstructure evolution in electron microscopes. This article focuses on the latest advances in MEMS-based nanomechanical testing techniques that go beyond stress and strain measurements under typical monotonic loadings. Specifi cally, recent advances in MEMS testing machines now enable probing key mechanical properties of nanomaterials related to fracture, fatigue, and wear. Tensile properties can be measured without instabilities or at high strain rates, and signature parameters such as activation volume can be obtained. Opportunities for environmental in situ nanomechanics enabled by MEMS technology are also discussed.

Published
2019

29. Splitting of magnetic dipole modes in anisotropic TiO2 micro-spheres

Author

KHROMOVA, Irina, KUŽEL, Petr, BRENER, Igal, RENO, John L., CHUNG SEU, U-Chan, ELISSALDE, Catherine, MAGLIONE, Mario, MOUNAIX, Patrick, MITROFANOV, Oleg, Department of Physics, King's College London, King‘s College London, ITMO University [Russia], Department of Electronic & Electrical Engineering - University College London, Institute of Physics [Prague], Czech Academy of Sciences [Prague] (CAS), Center for Integrated Nanotechnologies, Sandia National Laboratories [Albuquerque] (SNL), Sandia National Laboratories - Corporation-Sandia National Laboratories - Corporation, Sandia National Laboratories - Corporation, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Laboratoire de l'intégration, du matériau au système (IMS), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université Sciences et Technologies - Bordeaux 1, the Royal Society [Grant No. UF130493], RFBR [16-07-01166 and 14-22-02064-ofi-m], the Czech Science Foundation (project 14-25639S), LabEx AMADEus (ANR-10-LABX-42) in the framework of IdEx Bordeaux (ANR-10-IDEX-03-02)/i.e./ the Investissements d Avenir programme of the French government managed by the Agence Nationale de la Recherche, and partially supported by the Government of the Russian Federation [Grant No. 074-U01 and GZ 3.561.2014/K]. This work was performed at UCL and, in part, at the Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences user facility. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000., and ANR-10-IDEX-0003,IDEX BORDEAUX,Initiative d'excellence de l'Université de Bordeaux(2010)

Subjects
Condensed Matter::Materials Science, Physics::Optics, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; Monocrystalline titanium dioxide (TiO2) micro-spheres support two orthogonal magnetic dipole modes at terahertz (THz) frequencies due to strong dielectric anisotropy. For the first time, we experimentally detected the splitting of the first Mie mode in spheres of radii inline imagem through near-field time-domain THz spectroscopy. By fitting the Fano lineshape model to the experimentally obtained spectra of the electric field detected by the sub-wavelength aperture probe, we found that the magnetic dipole resonances in TiO2 spheres have narrow linewidths of only tens of gigahertz. Anisotropic TiO2 micro-resonators can be used to enhance the interplay of magnetic and electric dipole resonances in the emerging THz all-dielectric metamaterial technology.

Published
2016
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45. Nonadiabatic molecular dynamics analysis of hybrid Dion–Jacobson 2D leads iodide perovskites: A Nonadiabatic Molecular Dynamics Study

Author

Wang, Ying, Pedesseau, Laurent, Katan, Claudine, Even, Jacky, Prezhdo, Oleg, Tretiak, Sergei, Ghosh, Dibyajyoti, Neukirch, Amanda, University of Southern California (USC), Los Alamos National Laboratory (LANL), Institut des Fonctions Optiques pour les Technologies de l'informatiON (Institut FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Indian Institute of Technology Delhi (IIT Delhi), The work at Los Alamos National Laboratory (LANL) wassupported by the LANL LDRD program (S.G.L., F.L., W.N., A.J.N.,and S.T.). This work was done in part at Center for NonlinearStudies (CNLS) and the Center for Integrated Nanotechnologies(CINT), a U.S. Department of Energy and Office of Basic EnergySciences user facility, at LANL. This research used resourcesprovided by the LANL Institutional Computing Program. LANL isoperated by Triad National Security, LLC, for the National NuclearSecurity Administration of the U.S. Department of Energy underContract No. 89233218NCA000001. J.E. acknowledges the financialsupport from the Institut Universitaire de France. Y.W. and O.V.P.acknowledge support of the U. S. Department of Energy, Grant No.DE-SC0014429., Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
Abstract

International audience; The past six years have witnessed the rapid growth of interest in Dion–Jacobson (DJ) phase two-dimensional (2D) hybrid halide perovskitesas optoelectronic materials with considerable intrinsic stability. The precise relationships between structural variations and the resultingcharge carrier dynamics at finite temperature in these materials are keys to practical applications and are not yet completely understood.Here, we study 3-(aminomethyl) piperidinium (3AMP) and 4-(aminomethyl) piperidinium (4AMP) spacer cation-based lead iodide DJphase systems and find these spacer cations to have a profound impact on the structural dynamics. Particularly, large conformational dynamicsof the 3AMP-based perovskite compared to that of the 4AMP at room temperature leads to pronounced state energy fluctuation nearband edges and further results in a shorter quantum coherence. The faster quantum decoherence of the 3AMP spacer-based perovskiteunderpins a longer nonradiative lifetime, offering insight into its superior performance as an optoelectronic material. This work sheds lighton the relationship between structural fluctuations and charge carrier dynamics that can help in designing 2D perovskites with superior photophysicalproperties.

Published
2021
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