Journal ArticleDOI
Atomic-Scale Chemical Imaging of Composition and Bonding by Aberration-Corrected Microscopy
David A. Muller,L. Fitting Kourkoutis,M.F. Murfitt,J. H. Song,J. H. Song,Harold Y. Hwang,John Silcox,Niklas Dellby,Ondrej L. Krivanek +8 more
Reads0
Chats0
TLDR
Using a fifth-order aberration-corrected scanning transmission electron microscope, which provides a factor of 100 increase in signal over an uncorrected instrument, two-dimensional elemental and valence-sensitive imaging at atomic resolution is demonstrated by means of electron energy-loss spectroscopy.Abstract:
Using a fifth-order aberration-corrected scanning transmission electron microscope, which provides a factor of 100 increase in signal over an uncorrected instrument, we demonstrated two-dimensional elemental and valence-sensitive imaging at atomic resolution by means of electron energy-loss spectroscopy, with acquisition times of well under a minute (for a 4096-pixel image). Applying this method to the study of a La(0.7)Sr(0.3)MnO3/SrTiO3 multilayer, we found an asymmetry between the chemical intermixing on the manganese-titanium and lanthanum-strontium sublattices. The measured changes in the titanium bonding as the local environment changed allowed us to distinguish chemical interdiffusion from imaging artifacts.read more
Citations
More filters
Journal ArticleDOI
One-dimensional electrical contact to a two-dimensional material.
Lei Wang,Inanc Meric,Pinshane Y. Huang,Qun Gao,Yuanda Gao,Helen Tran,Takashi Taniguchi,Kenji Watanabe,Luis M. Campos,David A. Muller,Jing Guo,Philip Kim,James Hone,Kenneth L. Shepard,Cory Dean,Cory Dean +15 more
TL;DR: In graphene heterostructures, the edge-contact geometry provides new design possibilities for multilayered structures of complimentary 2D materials, and enables high electronic performance, including low-temperature ballistic transport over distances longer than 15 micrometers, and room-tem temperature mobility comparable to the theoretical phonon-scattering limit.
Journal ArticleDOI
Structurally ordered intermetallic platinum–cobalt core–shell nanoparticles with enhanced activity and stability as oxygen reduction electrocatalysts
Deli Wang,Huolin L. Xin,Huolin L. Xin,Robert Hovden,Hongsen Wang,Yingchao Yu,David A. Muller,Francis J. DiSalvo,Héctor D. Abruña +8 more
TL;DR: A new class of Pt-Co nanocatalysts composed of ordered Pt(3)Co intermetallic cores with a 2-3 atomic-layer-thick platinum shell with high activity and stability are described, providing a new direction for catalyst performance optimization for next-generation fuel cells.
Journal ArticleDOI
Optical excitations in electron microscopy
TL;DR: In this paper, a quantum-mechanical description of the interaction between the electrons and the sample is discussed, followed by a powerful classical dielectric approach that can be in practice applied to more complex systems.
Journal ArticleDOI
Atom-by-atom structural and chemical analysis by annular dark-field electron microscopy
Ondrej L. Krivanek,Matthew F. Chisholm,Valeria Nicolosi,Timothy J. Pennycook,Timothy J. Pennycook,G.J. Corbin,Niklas Dellby,M.F. Murfitt,Christopher S. Own,Z.S. Szilagyi,Mark P. Oxley,Mark P. Oxley,Sokrates T. Pantelides,Sokrates T. Pantelides,Stephen J. Pennycook,Stephen J. Pennycook +15 more
TL;DR: Annular dark-field imaging in an aberration-corrected scanning transmission electron microscope optimized for low voltage operation can resolve and identify the chemical type of every atom in monolayer hexagonal boron nitride that contains substitutional defects.
Journal ArticleDOI
Electron energy-loss spectroscopy in the TEM
TL;DR: An overview of electron energy-loss spectroscopy (EELS) instrumentation and the physics involved in the scattering of kilovolt electrons in solids can be found in this paper.
References
More filters
Journal ArticleDOI
Sub-ångstrom resolution using aberration corrected electron optics
TL;DR: The implementation of a computer-controlled aberration correction system in a scanning transmission electron microscope, which is less sensitive to chromatic aberration, is reported here and allows dynamic imaging of single atoms, clusters of a few atoms, and single atomic layer ‘rafts' of atoms coexisting with Au islands on a carbon substrate.
Journal ArticleDOI
Atomic-scale imaging of nanoengineered oxygen vacancy profiles in SrTiO3
David A. Muller,David A. Muller,Naoyuki Nakagawa,Naoyuki Nakagawa,A. Ohtomo,A. Ohtomo,J.L. Grazul,J.L. Grazul,Harold Y. Hwang,Harold Y. Hwang +9 more
TL;DR: The successful fabrication, using a pulsed laser deposition technique, of SrTiO3 superlattice films with oxygen doping profiles that exhibit subnanometre abruptness are reported, which open a pathway to the microscopic study of individual vacancies and their clustering, not only in oxides, but in crystalline materials more generally.
Journal ArticleDOI
NEXAFS investigations of transition metal oxides, nitrides, carbides, sulfides and other interstitial compounds
TL;DR: In this article, the authors review applications of the near-edge X-ray absorption fine structure (NEXAFS) technique in the investigations of electronic and structural properties of transition metal compounds.
Journal ArticleDOI
Simultaneous STEM imaging and electron energy-loss spectroscopy with atomic-column sensitivity
TL;DR: In this article, the oxidation state of individual columns of unit cells, containing pairs of silicon atoms, can be resolved with this method, allowing the structure of the interface to be characterized in great detail.
Journal ArticleDOI
Element-selective imaging of atomic columns in a crystal using STEM and EELS
TL;DR: In this article, the atomic columns of La, Mn and O in the layered manganite La1.2Sr1.8Mn2O7 are visualized as two-dimensional images.