scholarly journals Kinetics and Mechanism of Metal Nanoparticle Growth via Optical Extinction Spectroscopy and Computational Modeling: The Curious Case of Colloidal Gold

ACS Nano ◽  
2019 ◽  
Vol 13 (10) ◽  
pp. 11510-11521 ◽  
Author(s):  
M. Reza Andalibi ◽  
Alexander Wokaun ◽  
Paul Bowen ◽  
Andrea Testino
Keyword(s):  
Computational Modeling ◽  
Colloidal Gold ◽  
Kinetics And Mechanism ◽  
Metal Nanoparticle ◽  
Optical Extinction ◽  
Nanoparticle Growth ◽  
Optical Extinction Spectroscopy

scholarly journals Symmetry Breaking by Surface Blocking: Synthesis of Bimorphic Silver Nanoparticles, Nanoscale Fishes and Apples

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Nicole Cathcart ◽  
Vladimir Kitaev
Keyword(s):  
Silver Nanoparticles ◽  
Acrylic Acid ◽  
Symmetry Breaking ◽  
Metal Nanoparticle ◽  
Shape Design ◽  
Seeded Growth ◽  
Nanoparticle Growth ◽  
Powerful Approach ◽  
Advanced Applications ◽  
Nucleation Point

Abstract A powerful approach to augment the diversity of well-defined metal nanoparticle (MNP) morphologies, essential for MNP advanced applications, is symmetry breaking combined with seeded growth. Utilizing this approach enabled the formation of bimorphic silver nanoparticles (bi-AgNPs) consisting of two shapes linked by one regrowth point. Bi-AgNPs were formed by using an adsorbing polymer, poly(acrylic acid), PAA, to block the surface of a decahedral AgNP seed and restricting growth of new silver to a single nucleation point. First, we have realized 2-D growth of platelets attached to decahedra producing nanoscale shapes reminiscent of apples, fishes, mushrooms and kites. 1-D bimorphic growth of rods (with chloride) and 3-D bimorphic growth of cubes and bipyramids (with bromide) were achieved by using halides to induce preferential (100) stabilization over (111) of platelets. Furthermore, the universality of the formation of bimorphic nanoparticles was demonstrated by using different seeds. Bi-AgNPs exhibit strong SERS enhancement due to regular cavities at the necks. Overall, the reported approach to symmetry breaking and bimorphic nanoparticle growth offers a powerful methodology for nanoscale shape design.

XANES and EXAFS studies on metal nanoparticle growth and bimetallic interaction of Ni-based catalysts for CO2 reforming of CH4

2013 ◽  
Vol 207 ◽  
pp. 3-12 ◽  
Author(s):  
Hui Wang ◽  
Jeffrey T. Miller ◽  
Mohsen Shakouri ◽  
Chunyu Xi ◽  
Tianpin Wu ◽  
...  
Keyword(s):  
Metal Nanoparticle ◽  
Co2 Reforming ◽  
Nanoparticle Growth ◽  
Co2 Reforming Of Ch4

Determination of the size distribution of metallic nanoparticles by optical extinction spectroscopy

2009 ◽  
Vol 48 (3) ◽  
pp. 566 ◽  
Author(s):  
Ovidio Peña ◽  
Luis Rodríguez-Fernández ◽  
Vladimir Rodríguez-Iglesias ◽  
Guinther Kellermann ◽  
Alejandro Crespo-Sosa ◽  
...  
Keyword(s):  
Size Distribution ◽  
Metallic Nanoparticles ◽  
Optical Extinction ◽  
Optical Extinction Spectroscopy

Optical extinction spectroscopy of single silver nanoparticles

2007 ◽  
Vol 43 (1-3) ◽  
pp. 271-274 ◽  
Author(s):  
P. Billaud ◽  
J.-R. Huntzinger ◽  
E. Cottancin ◽  
J. Lermé ◽  
M. Pellarin ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Optical Extinction ◽  
Optical Extinction Spectroscopy

scholarly journals A New in-situ Exsolution Supporting Framework for Metal Nanoparticle Growth

2021 ◽  
Author(s):  
Mengchu Wang ◽  
Bike Zhang ◽  
Jiaqi Ding ◽  
Fanxing Zhang ◽  
Rui Tu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
High Stability ◽  
Room Temperature ◽  
Design Principle ◽  
Metal Nanoparticle ◽  
Uniform Size ◽  
Faradaic Efficiency ◽  
Nanoparticle Growth ◽  
Catalytic Materials

Abstract Catalysts made of in-situ exsolved metal nanoparticles often demonstrate promising activity and high stability in many applications. However, the design of these catalysts is greatly constrained by the classic exsolution mechanism, which occurs almost exclusively through substitutional metal-doping in perovskites. Here we show that metal nanoparticles can also be in-situ exsolved from interstitially doped metal cations in a NiOOH supporting framework with the guidance of theoretical calculation. The exsolution can be conducted swiftly at room temperature. A novel copper nanocatalyst prepared with this approach have a quasi-uniform size of 4 nm delivering an exceptional CO faradaic efficiency of 95.6% with a notable durability for the electrochemical reduction of CO2. This design principle is further proven to be generally applicable to other metals and foregrounded for guiding the development of advanced catalytic materials.

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