Defects evolution of nanoporous AuAg(Pt) during thermal coarsening

2016 ◽  
Vol 119 ◽  
pp. 51-54 ◽  
Author(s):  
Panpan Gao ◽  
Xinglong Ye ◽  
Zhejie Zhu ◽  
Yichu Wu ◽  
Alex A. Volinsky ◽  
...  
Keyword(s):  
Thermal Coarsening

scholarly journals High thermal coarsening resistance of irradiation-induced nanoprecipitates in Cu-Mo-Si alloys

2017 ◽  
Vol 132 ◽  
pp. 432-443 ◽  
Author(s):  
Jaeyel Lee ◽  
John Beach ◽  
Pascal Bellon ◽  
Robert S. Averback
Keyword(s):  
Thermal Coarsening

Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design

2019 ◽  
Vol 32 (6) ◽  
pp. 1906160 ◽  
Author(s):  
Soo‐Hyun Joo ◽  
Jae Wung Bae ◽  
Won‐Young Park ◽  
Yusuke Shimada ◽  
Takeshi Wada ◽  
...  
Keyword(s):  
Nanoporous Materials ◽  
High Entropy ◽  
Thermal Coarsening

scholarly journals Nanoporous Materials: Beating Thermal Coarsening in Nanoporous Materials via High‐Entropy Design (Adv. Mater. 6/2020)

2020 ◽  
Vol 32 (6) ◽  
pp. 2070044
Author(s):  
Soo‐Hyun Joo ◽  
Jae Wung Bae ◽  
Won‐Young Park ◽  
Yusuke Shimada ◽  
Takeshi Wada ◽  
...  
Keyword(s):  
Nanoporous Materials ◽  
High Entropy ◽  
Thermal Coarsening

Thermal coarsening of nanoporous gold: Melting or recrystallization

2009 ◽  
Vol 24 (2) ◽  
pp. 301-304 ◽  
Author(s):  
Masataka Hakamada ◽  
Mamoru Mabuchi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Solid State ◽  
Melting Temperature ◽  
Thermal Instability ◽  
Au Nanoparticles ◽  
Nanoporous Gold ◽  
Scanning Calorimetry ◽  
State Process ◽  
Thermal Coarsening

The thermal coarsening of nanoporous Au was examined and compared with the thermal instability of Au nanoparticles. The nanoporous Au was coarsened at temperatures far below the melting temperature of Au nanoparticles, which possess sizes similar to the nanoligaments. Differential scanning calorimetry characterization of nanoporous Au exhibited an exothermal peak around 470 K. These results suggest that solid-state process like recrystallization, rather than melting, is responsible for the thermal coarsening of nanoporous Au.

scholarly journals Environment-Sensitive Thermal Coarsening of Nanoporous Gold

2015 ◽  
Vol 56 (4) ◽  
pp. 468-472 ◽  
Author(s):  
Satoko Kuwano-Nakatani ◽  
Takeshi Fujita ◽  
Kazuki Uchisawa ◽  
Daichi Umetsu ◽  
Yu Kase ◽  
...  
Keyword(s):  
Nanoporous Gold ◽  
Thermal Coarsening

scholarly journals On the Development of Optical Properties during Thermal Coarsening of Gold Nanoparticle Composites

2018 ◽  
Vol 122 (22) ◽  
pp. 12098-12105 ◽  
Author(s):  
Shirin R. King ◽  
Angus R. Gentle ◽  
Michael B. Cortie ◽  
Andrew M. McDonagh
Keyword(s):  
Optical Properties ◽  
Gold Nanoparticle ◽  
Nanoparticle Composites ◽  
Thermal Coarsening

scholarly journals Thermal coarsening of individual titanate nanowires and their assemblies: Surface vs. bulk diffusion

2020 ◽  
Vol 46 (10) ◽  
pp. 16321-16327 ◽  
Author(s):  
L. Rossi ◽  
X. Berdat ◽  
M. Spina ◽  
S. Brown ◽  
L. Bernard ◽  
...  
Keyword(s):  
Bulk Diffusion ◽  
Titanate Nanowires ◽  
Thermal Coarsening

scholarly journals In situ STEM/SEM study of Thermal Coarsening of Pt-modified Nanoporous Gold in Oxygen and Hydrogen

2018 ◽  
Vol 24 (S1) ◽  
pp. 1946-1947 ◽  
Author(s):  
Ayman A. El-Zoka ◽  
Jane Howe ◽  
Peter Brodersen ◽  
Doug D. Perovic ◽  
Roger C. Newman
Keyword(s):  
Nanoporous Gold ◽  
Sem Study ◽  
Thermal Coarsening

scholarly journals Morphological evolution of Pt-modified nanoporous gold after thermal coarsening in reductive and oxidative environments

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
A. A. El-Zoka ◽  
B. Langelier ◽  
G. A. Botton ◽  
R. C. Newman
Keyword(s):  
Surface Area ◽  
Morphological Evolution ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Atom Probe ◽  
Nanoporous Gold ◽  
Atomic Scale ◽  
Thermal Coarsening

AbstractNanoporous gold made by dealloying AgAuPt (NPG-Pt) has been shown to exhibit several interesting catalytic properties, tied to its exceptionally high surface area; however, structural degradation may occur owing to thermal coarsening. To understand the effect of atmosphere chemistry on thermal coarsening and degradation, and means of limiting it, this study focuses on the high-resolution characterization of NPG-Pt layers coarsened in reductive Ar-H2 atmosphere, and in oxidative air. Atom probe tomography (APT) analysis is performed on NPG-Pt, coarsened separately in either Ar-H2 or air, to characterize the atomic-scale chemical changes in the nanoligaments and to develop a mechanistic view of the inherent processes. A tendency of Ag to segregate to the surface during coarsening is found to lead to complete elimination of the nanoligament core-shell structures in both cases. Large Pt segregates form during coarsening in Ar-H2, but under the surface of the ligaments, having relatively little effect on the coarsening rate. The oxygen-induced segregation of Pt was observed to cause the inhibition of thermal coarsening after minor loss in surface area-to-volume ratio. Findings in this paper help in understanding further the thermal coarsening of heterogeneous nanomaterials made by dealloying, and the pertinent factors that come into play in different chemical environments.

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