Core−Shell Phase Separation and Structural Transformation of Pt3Sn Alloy Nanoparticles Supported on γ-Al2O3 in the Reduction and Oxidation Processes Characterized by In Situ Time-Resolved XAFS

2011 ◽  
Vol 115 (13) ◽  
pp. 5823-5833 ◽  
Author(s):  
Yohei Uemura ◽  
Yasuhiro Inada ◽  
Kyoko K. Bando ◽  
Takehiko Sasaki ◽  
Naoto Kamiuchi ◽  
...  
Keyword(s):  
Phase Separation ◽  
Structural Transformation ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Time Resolved ◽  
Oxidation Processes ◽  
Reduction And Oxidation

In Situ Atomic-Scale Observation of Surface-Tension-Induced Structural Transformation of Ag-NiPx Core–Shell Nanocrystals

ACS Nano ◽  
2018 ◽  
Vol 12 (7) ◽  
pp. 7197-7205 ◽  
Author(s):  
Xing Huang ◽  
Zhongqiang Liu ◽  
Marie-Mathilde Millet ◽  
Jichen Dong ◽  
Milivoj Plodine ◽  
...  
Keyword(s):  
Surface Tension ◽  
Structural Transformation ◽  
Atomic Scale ◽  
Core Shell

In Situ Phase Separation of NiAu Alloy Nanoparticles for Preparing Highly Active Au/NiO CO Oxidation Catalysts

ChemPhysChem ◽  
2008 ◽  
Vol 9 (17) ◽  
pp. 2475-2479 ◽  
Author(s):  
Shenghu Zhou ◽  
Hongfeng Yin ◽  
Viviane Schwartz ◽  
Zili Wu ◽  
David Mullins ◽  
...  
Keyword(s):  
Phase Separation ◽  
Co Oxidation ◽  
Alloy Nanoparticles ◽  
Oxidation Catalysts ◽  
Highly Active

scholarly journals In-situ DRIFT investigation of photocatalytic reduction and oxidation properties of SiO2@α-Fe2O3 core-shell decorated RGO nanocomposite

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Uma Kasimayan ◽  
Arjun Nadarajan ◽  
Chandra Mohan Singaravelu ◽  
Guan-Ting Pan ◽  
Jothivenkatachalam Kandasamy ◽  
...  
Keyword(s):  
Photocatalytic Reduction ◽  
Core Shell ◽  
Oxidation Properties ◽  
In Situ Drift ◽  
Reduction And Oxidation

In situ dilatometric and impedance spectroscopic study of core–shell like structures: insights into the exceptional catalytic activity of nanocrystalline Cu-doped CeO2

2015 ◽  
Vol 3 (16) ◽  
pp. 8369-8379 ◽  
Author(s):  
Philippe Knauth ◽  
Howard Saltsburg ◽  
Johanna Engel ◽  
Harry L. Tuller
Keyword(s):  
Catalytic Activity ◽  
Phase Separation ◽  
Spectroscopic Study ◽  
Catalytic Properties ◽  
Core Shell ◽  
Doped Ceo2 ◽  
Dopant Redistribution ◽  
The Impact

The impact of temperature and pO2 driven dopant redistribution and phase separation on thermo-mechanical, electrical and catalytic properties of Cu–doped CeO2 nanoparticles is explored.

Exciton dynamics in thick GaN MOVPE epilayers deposited on sapphire.

1997 ◽  
Vol 2 ◽  
Author(s):  
J. Allègre ◽  
P. Lefebvre ◽  
J. Camassel ◽  
B. Beaumont ◽  
Pierre Gibart
Keyword(s):  
Layer Thickness ◽  
Buffer Layers ◽  
Rate Equations ◽  
Time Resolved ◽  
Versus Layer ◽  
Level Model ◽  
Shallow Impurities ◽  
Aln Buffer ◽  
Time Resolved Photoluminescence

Time-resolved photoluminescence spectra have been recorded on three GaN epitaxial layers of thickness 2.5 μm, 7 μm and 16 μm, at various temperatures ranging from 8K to 300K. The layers were deposited by MOVPE on (0001) sapphire substrates with standard AlN buffer layers. To achieve good homogeneities, the growth was in-situ monitored by laser reflectometry. All GaN layers showed sharp excitonic peaks in cw PL and three excitonic contributions were seen by reflectivity. The recombination dynamics of excitons depends strongly upon the layer thickness. For the thinnest layer, exponential decays with τ ~ 35 ps have been measured for both XA and XB free excitons. For the thickest layer, the decay becomes biexponential with τ1 ~ 80 ps and τ2 ~ 250 ps. These values are preserved up to room temperature. By solving coupled rate equations in a four-level model, this evolution is interpreted in terms of the reduction of density of both shallow impurities and deep traps, versus layer thickness, roughly following a L−1 law.

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