Icosahedral Platinum Alloy Nanocrystals with Enhanced Electrocatalytic Activities

2012 ◽  
Vol 134 (29) ◽  
pp. 11880-11883 ◽  
Author(s):  
Jianbo Wu ◽  
Liang Qi ◽  
Hongjun You ◽  
Adam Gross ◽  
Ju Li ◽  
...  
Keyword(s):  
Platinum Alloy ◽  
Alloy Nanocrystals

ChemInform Abstract: Icosahedral Gold-Platinum Alloy Nanocrystals in Hollow Silica: A Highly Active and Stable Catalyst for Ullmann Reactions.

ChemInform ◽  
2014 ◽  
Vol 45 (18) ◽  
pp. no-no
Author(s):  
Xiaoli Wu ◽  
Longfei Tan ◽  
Dong Chen ◽  
Xianwei Meng ◽  
Fangqiong Tang
Keyword(s):  
Hollow Silica ◽  
Platinum Alloy ◽  
Alloy Nanocrystals ◽  
Highly Active ◽  
Stable Catalyst ◽  
Gold Platinum

Twin-Induced Growth of Palladium-Platinum Alloy Nanocrystals

2009 ◽  
Vol 48 (34) ◽  
pp. 6304-6308 ◽  
Author(s):  
Byungkwon Lim ◽  
Jinguo Wang ◽  
Pedro H. C. Camargo ◽  
Claire M. Cobley ◽  
Moon J. Kim ◽  
...  
Keyword(s):  
Platinum Alloy ◽  
Alloy Nanocrystals ◽  
Palladium Platinum

Twin-Induced Growth of Palladium-Platinum Alloy Nanocrystals

2009 ◽  
Vol 121 (34) ◽  
pp. 6422-6426 ◽  
Author(s):  
Byungkwon Lim ◽  
Jinguo Wang ◽  
Pedro H. C. Camargo ◽  
Claire M. Cobley ◽  
Moon J. Kim ◽  
...  
Keyword(s):  
Platinum Alloy ◽  
Alloy Nanocrystals ◽  
Palladium Platinum

Element-specific anisotropic growth of shaped platinum alloy nanocrystals

Science ◽  
2014 ◽  
Vol 346 (6216) ◽  
pp. 1502-1506 ◽  
Author(s):  
Lin Gan ◽  
Chunhua Cui ◽  
Marc Heggen ◽  
Fabio Dionigi ◽  
Stefan Rudi ◽  
...  
Keyword(s):  
Scanning Transmission Electron Microscopy ◽  
Chemical Degradation ◽  
Anisotropic Growth ◽  
Growth Mechanisms ◽  
Platinum Alloy ◽  
Alloy Nanocrystals ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Compositional Patterns ◽  
Alloy Catalysts

Morphological shape in chemistry and biology owes its existence to anisotropic growth and is closely coupled to distinct functionality. Although much is known about the principal growth mechanisms of monometallic shaped nanocrystals, the anisotropic growth of shaped alloy nanocrystals is still poorly understood. Using aberration-corrected scanning transmission electron microscopy, we reveal an element-specific anisotropic growth mechanism of platinum (Pt) bimetallic nano-octahedra where compositional anisotropy couples to geometric anisotropy. A Pt-rich phase evolves into precursor nanohexapods, followed by a slower step-induced deposition of an M-rich (M = Ni, Co, etc.) phase at the concave hexapod surface forming the octahedral facets. Our finding explains earlier reports on unusual compositional segregations and chemical degradation pathways of bimetallic polyhedral catalysts and may aid rational synthesis of shaped alloy catalysts with desired compositional patterns and properties.

Icosahedral gold–platinum alloy nanocrystals in hollow silica: a highly active and stable catalyst for Ullmann reactions

2014 ◽  
Vol 50 (5) ◽  
pp. 539-541 ◽  
Author(s):  
Xiaoli Wu ◽  
Longfei Tan ◽  
Dong Chen ◽  
Xianwei Meng ◽  
Fangqiong Tang
Keyword(s):  
Hollow Silica ◽  
Platinum Alloy ◽  
Alloy Nanocrystals ◽  
Highly Active ◽  
Stable Catalyst ◽  
Gold Platinum

scholarly journals Synthesis of gold, platinum, and gold-platinum alloy nanoparticle colloids with high-power megahertz-repetition-rate lasers: the importance of the beam guidance method

2021 ◽  
Author(s):  
Friedrich Waag ◽  
René Streubel ◽  
Bilal Gökce ◽  
Stephan Barcikowski
Keyword(s):  
Laser Ablation ◽  
Noble Metals ◽  
Saline Water ◽  
Synthesis Method ◽  
Laser Ablation In Liquid ◽  
Platinum Alloy ◽  
Lower Productivity ◽  
Pattern Length ◽  
Scan Pattern ◽  
Gold Platinum

AbstractNanoparticles of noble metals and their alloys are of particular interest for biomedicine and catalysis applications. The method of laser ablation of bulk metals in liquids gives facile access to such particles as  high-purity colloids and is already used in industrial research. However, the method still lacks sufficient productivity for industrial implementation into series production. The use of innovative laser technology may help to further disseminate this colloid synthesis method in the near future. Ultrashort-pulsed lasers with high powers and megahertz-repetition-rates became available recently, but place high demands on the accurate optical laser pulse delivery on the target. Full lateral pulse separation is necessary to avoid a reduction of nanoparticle productivity due to pulse shielding. In this study, we compare flexible but rather slow galvanometer scanning with much faster but more expensive polygon-wheel scanning in their performance in the production of colloidal nanoparticles by laser ablation in liquid. Both beam guidance technologies are applied in the laser ablation of gold, platinum, and a gold-rich platinum alloy in micromolar saline water. We found that the dimensions of the scan pattern are crucial. A threshold pattern length exists, at which one scan technology becomes more productive than the other one. In addition, a much lower productivity was found for the ablation of gold compared to that of platinum. Alloying gold with only 10 at.% of platinum improved the productivity nearly to the level of platinum, reaching 8.3 g/h.

Synthesis of highly luminescent Cd(Se,S) alloy nanocrystals

2010 ◽  
Author(s):  
Young-Kuk Kim ◽  
Young-Sang Cho ◽  
Kookchae Chung ◽  
Chul-Jin Choi
Keyword(s):  
Alloy Nanocrystals
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