Atomic-scale imaging of the defect dynamics in ceria nanowires under heating by in situ aberration-corrected TEM

2019 ◽  
Vol 62 (12) ◽  
pp. 1704-1709 ◽  
Author(s):  
Xiaomin Li ◽  
Kaihui Liu ◽  
Wenlong Wang ◽  
Xuedong Bai
Keyword(s):  
Atomic Scale ◽  
Aberration Corrected

Atomic-Scale Imaging and Spectroscopy for In Situ Liquid Scanning Transmission Electron Microscopy

2012 ◽  
Vol 18 (3) ◽  
pp. 621-627 ◽  
Author(s):  
Katherine L. Jungjohann ◽  
James E. Evans ◽  
Jeffery A. Aguiar ◽  
Ilke Arslan ◽  
Nigel D. Browning
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Scanning Transmission Electron Microscopy ◽  
Path Length ◽  
Atomic Scale ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Aberration Corrected

AbstractObservation of growth, synthesis, dynamics, and electrochemical reactions in the liquid state is an important yet largely unstudied aspect of nanotechnology. The only techniques that can potentially provide the insights necessary to advance our understanding of these mechanisms is simultaneous atomic-scale imaging and quantitative chemical analysis (through spectroscopy) under environmental conditions in the transmission electron microscope. In this study we describe the experimental and technical conditions necessary to obtain electron energy loss (EEL) spectra from a nanoparticle in colloidal suspension using aberration-corrected scanning transmission electron microscopy (STEM) combined with the environmental liquid stage. At a fluid path length below 400 nm, atomic resolution images can be obtained and simultaneous compositional analysis can be achieved. We show that EEL spectroscopy can be used to quantify the total fluid path length around the nanoparticle and demonstrate that characteristic core-loss signals from the suspended nanoparticles can be resolved and analyzed to provide information on the local interfacial chemistry with the surrounding environment. The combined approach using aberration-corrected STEM and EEL spectra with the in situ fluid stage demonstrates a plenary platform for detailed investigations of solution-based catalysis.

scholarly journals In situ manipulation of the active Au-TiO2 interface with atomic precision during CO oxidation

Science ◽  
2021 ◽  
Vol 371 (6528) ◽  
pp. 517-521 ◽  
Author(s):  
Wentao Yuan ◽  
Beien Zhu ◽  
Ke Fang ◽  
Xiao-Yan Li ◽  
Thomas W. Hansen ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Critical Role ◽  
Operating Conditions ◽  
Catalytic Reactions ◽  
Atomic Scale ◽  
Metal Catalyst ◽  
Transmission Electron ◽  
Atomic Precision ◽  
Aberration Corrected

The interface between metal catalyst and support plays a critical role in heterogeneous catalysis. An epitaxial interface is generally considered to be rigid, and tuning its intrinsic microstructure with atomic precision during catalytic reactions is challenging. Using aberration-corrected environmental transmission electron microscopy, we studied the interface between gold (Au) and a titanium dioxide (TiO2) support. Direct atomic-scale observations showed an unexpected dependence of the atomic structure of the Au-TiO2 interface with the epitaxial rotation of gold nanoparticles on a TiO2 surface during carbon monoxide (CO) oxidation. Taking advantage of the reversible and controllable rotation, we achieved in situ manipulation of the active Au-TiO2 interface by changing gas and temperature. This result suggests that real-time design of the catalytic interface in operating conditions may be possible.

Critical Influence of Redox Pretreatments on the CO Oxidation Activity of BaFeO3−δ Perovskites: An in-Depth Atomic-Scale Analysis by Aberration-Corrected and in Situ Diffraction Techniques

ACS Catalysis ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 8653-8663 ◽  
Author(s):  
Achraf el Hadri ◽  
Isabel Gómez-Recio ◽  
Eloy del Río ◽  
Juan C. Hernández-Garrido ◽  
Raquel Cortés-Gil ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Atomic Scale ◽  
Scale Analysis ◽  
Oxidation Activity ◽  
In Situ Diffraction ◽  
Aberration Corrected

scholarly journals In Situ Observation of Electron-Beam-Induced Formation of Nano-Structures in PbTe

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 163
Author(s):  
Iryna Zelenina ◽  
Igor Veremchuk ◽  
Yuri Grin ◽  
Paul Simon
Keyword(s):  
Electron Beam ◽  
Gas Phase ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Atomic Scale ◽  
In Situ Observation ◽  
Nano Structures ◽  
Transmission Electron ◽  
Initial Crystal

Nano-scaled thermoelectric materials attract significant interest due to their improved physical properties as compared to bulk materials. Well-shaped nanoparticles such as nano-bars and nano-cubes were observed in the known thermoelectric material PbTe. Their extended two-dimensional nano-layer arrangements form directly in situ through electron-beam treatment in the transmission electron microscope. The experiments show the atomistic depletion mechanism of the initial crystal and the recrystallization of PbTe nanoparticles out of the microparticles due to the local atomic-scale transport via the gas phase beyond a threshold current density of the beam.

scholarly journals Front Cover: Structure Matters – Direct In‐situ Observation of Cluster Nucleation at Atomic Scale in a Liquid Phase (2/2021)

ChemNanoMat ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 100-100
Author(s):  
Trond R. Henninen ◽  
Debora Keller ◽  
Rolf Erni
Keyword(s):  
Liquid Phase ◽  
Atomic Scale ◽  
In Situ Observation ◽  
Phase 2 ◽  
Front Cover

scholarly journals Microstructure and properties of nano-laminated Y3Si2C2 ceramics fabricated via in situ reaction by spark plasma sintering

2021 ◽  
Vol 10 (3) ◽  
pp. 578-586
Author(s):  
Lin-Kun Shi ◽  
Xiaobing Zhou ◽  
Jian-Qing Dai ◽  
Ke Chen ◽  
Zhengren Huang ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Atomic Scale ◽  
Max Phase ◽  
X Ray Diffraction ◽  
Selected Area Electron Diffraction ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Spark Plasma ◽  
Diffraction Patterns

AbstractA nano-laminated Y3Si2C2 ceramic material was successfully synthesized via an in situ reaction between YH2 and SiC using spark plasma sintering technology. A MAX phase-like ternary layered structure of Y3Si2C2 was observed at the atomic-scale by high resolution transmission electron microscopy. The lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical results. The nano-laminated fracture of kink boundaries, delamination, and slipping were observed at the tip of the Vickers indents. The elastic modulus and Vickers hardness of Y3Si2C2 ceramics (with 5.5 wt% Y2O3) sintered at 1500 °C were 156 and 6.4 GPa, respectively. The corresponding values of thermal and electrical conductivity were 13.7 W·m-1·K-1 and 6.3×105 S·m-1, respectively.

scholarly journals Atomic-Scale Chemical Imaging of Interdiffusion and Defects in (La0.7Sr0.3MnO3)5/(SrTiO3)5 Multilayers by Aberration Corrected Microscopy

2009 ◽  
Vol 15 (S2) ◽  
pp. 428-429
Author(s):  
LF Kourkoutis ◽  
JH Song ◽  
HY Hwang ◽  
DA Muller
Keyword(s):  
Chemical Imaging ◽  
Atomic Scale ◽  
Aberration Corrected

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

Multimodal Optical Nanoprobe for Advanced In-Situ Electron Microscopy

2012 ◽  
Vol 20 (6) ◽  
pp. 32-37 ◽  
Author(s):  
Y. Zhu ◽  
M. Milas ◽  
M.-G. Han ◽  
J.D. Rameau ◽  
M. Sfeir
Keyword(s):  
Electron Microscopy ◽  
Driving Forces ◽  
Atomic Scale ◽  
Magnetic Domains ◽  
Photovoltaic Devices ◽  
Electromagnetic Devices ◽  
In Situ Electron Microscopy ◽  
Electric And Magnetic Fields ◽  
Anions And Cations

In-situ electron microscopy has gained considerable attention in recent years. It provides a “live” view of a material or device under study at various length scales. For example, by heating or cooling a sample one can study structural change at the atomic scale to understand the driving forces and mechanisms of phase transitions. By applying electric and magnetic fields on a ferroelectric or magnetic architecture in operation, one can directly observe how electric and magnetic domains switch, how anions and cations shift their positions, and how spins change their configuration across a domain wall, aiding the development of better electromagnetic devices. In the study of photovoltaic devices and junctions, a major challenge is to directly correlate light-induced electric currents with local structural inhomogeneities and dynamics. Such a capability would allow us to evaluate the performance of individual p-n junctions and to improve optoelectronic efficiency.

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