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Showing 1 to 14 of 14 for “"HAADF-STEM"”.
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Avances y limitaciones de la técnica de microscopia electrónica de transmisión-barrido con detección de electrones a alto ángulo para el análisis de nuevos nanomateriales con aplicaciones en eficiencia energética.
… optoelectrónicos de alta eficiencia basados en sistemas epitaxiales de heteroestructuras semiconductoras III-V. Los materiales semiconductores estudiados consisten en sistemas InAlAsSb-InP destinados al desarrollo de celdas solares ultra-eficientes con arquitectura multiunión, y en sistemas …
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Electron microscopy characterisation of size-selected Pd clusters and industrial Pd catalysts
… field scanning transmission electron microscopy (HAADF-STEM) technique. The driving force of this work is to establish reliable and efficient methods for the structural characterisation of nanostructures. The characterisation of nanostructures is essential to our fundamental understanding of …
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Nanoscale characterization of InSb/InAs novel functional semiconductor nanostructures for LEDs / Caracterización a nanoescala de nanoestructuras funcionales novedosas de InSb/InAs para LEDs
… column resolved high angle annular dark field (HAADF) – scanning transmission electron microscopy (STEM) characterization technique has been considered, where Sb compositions are realized through HAADF-STEM atomic column intensities. In order to interpret the Sb composition through HAADF-STEM …
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Quantitative High-angle Annular Dark Field Scanning Transmission To Electron Microscopy For Materials Science
Scanning transmission electron microscopy (STEM) has been widely used for characterization of materials; to identify micro- and nano-structures within a sample and to analyze crystal and defect structures. High-angle annular dark field (HAADF) STEM imaging using atomic number (Z) contrast has …
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Structure and Dynamics in Ligand-Protected and Supported Metal Nanoparticles
… field scanning transmission electron microscopy (HAADF-STEM) measurements characterize metal clusters and nanoparticles on the basis of the number of metal atoms they contain. Ligand-protected 13-atom gold clusters serve as a model system to illustrate the capabilities of a correlated use of these …
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Shear-band structure in metallic glasses
… thickness, and density variation, of a single system-spanning shear band that has carried all plastic flow were sampled along its millimeter-length path with high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). It was found that those properties sensitively depend …
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Gold-containing bimetallicnanoparticles
… electron microscopy (TEM) and scanning TEM (STEM) combined with high angle annular dark field (HAADF) imaging, energy dispersive X-ray elemental mapping using a silicon drift detector (SDD), tomography, and electron energy loss spectroscopy (EELS). Sizes and shapes of the Cu-Au, Pd-Au, and …
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Atomic structure and defects of III-V compound semiconductor strained-layer-superlattices for infrared detection
… Here, scanning transmission electron microscopy (STEM) is used as a major tool for structural characterization of SLSs. In a STEM with a high angle annular dark field (HAADF) detector, the recorded real space image can be readily interpreted based on the peak intensities and peak positions as the …
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ECO-FRIENDLY HYDROXYAPATITE-BASED MATERIALS AS METAL ADSORBENTS: OPTIMIZATION OF SURFACE PROPERTIES FOR WATER AND WASTEWATER REMEDIATION
… XPS, 119Sn Mӧssbauer spectroscopy, TEM, and HAADF-STEM/EDS provided insights into tin speciation, structural composition, and morphological features, revealing structural differences between the materials. Sn/HAP was found to be crystalline, indicating that Sn surface deposition did not alter …
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Structure Sensitivity of Alkanes Hydrogenolysis and Alkynes Hydrogenation on Supported Ir Catalysts
In many catalytic systems, the activity and selectivity of supported metal catalysts or extended metal surface catalysts would be affected by the metal surface structure, and this phenomenon is called structure sensitivity. Generally, structure sensitivity is led by the change of geometric and …
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Evolution Of Lamellar Structures In Al-ag Alloys
In the present study, the formation and the evolution of lamellar structures in different Al-Ag alloys were investigated by transmission electron microscopy (TEM). Plates of the hexagonal [gamma] phase form semi-coherently on the {111} planes of the face centered cubic lattice of the alloy after …
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Gold And Silver Alloy Nanoparticles: Synthesis, Characterization And Atomic Structure
… with high angle annular dark field imaging (HAADF-STEM), high energy X-ray based atomic pair distribution function (PDF) analysis and small angle X-ray scattering (SAXS). Composition determination of large nanocrystals is challenging due to the lack of available techniques to quantify the …
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Síntesis de nanoestruturas metálicas de oro y plata a partir de precursores organometálicos: Propiedades plasmónicas y catalíticas
… of the core-shell morphology through HAADF-STEM and EDX techniques. In the same way as in the former chapters we have studied the formation of the new nanostructures by the use of UV-Vis absorption spectroscopy, transmission electron microscopy and nuclear magnetic resonance, what has …
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Characterization of type-II GaSb quantum rings in GaAs solar cells
… tail states leading to potential fluctuations. Systematic measurements of dark current versus voltage characteristics are carried out from 100 to 290 K. Compared with the reference GaAs solar cell, the QRSC exhibits larger dark current, however its ideality factor n is similar at 290 K. QRs are …