Journal ArticleDOI
New Insights on the Growth of Anisotropic Nanoparticles from Total Energy Calculations
Túlio C. R. Rocha,Fernando Sato,Sócrates O. Dantas,Douglas S. Galvao,Daniela Zanchet +4 more
- Vol. 113, Iss: 28, pp 11976-11979
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TLDR
In this article, the authors provided new insights of why anisotropic structures are commonly found in different preparation conditions, assuming the presence of a particle shape distribution in the beginning of the growth process.Abstract:
The growth mechanism of anisotropic metallic nanoparticles is still an open and polemical question. The common observation of the existence of nonspherical (not the most stable) shapes in varied experimental conditions is not fully understood. In this work, based on results from total energy calculations for different shapes and sizes of Ag nanoparticles, we provide new insights of why anisotropic structures are commonly found in different preparation conditions. We show that, assuming the presence of a particle shape distribution in the beginning of the growth process, anisotropic nanoparticles can preferentially grow over spherical ones due to the fact that the energy required to build larger anisotropic structures could be less than the one required to build isotropic structures. These results suggest that many previous works in literature shall be revisited accordingly to these new finds.read more
Citations
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A Real Time Microscopy Study of the Growth of Giant Au Microplates
Boya Radha,Giridhar U. Kulkarni +1 more
TL;DR: A simple air-thermolysis of a precursor, (AuCl4)− phase transferred from aqueous medium and stabilized in toluene by tetraoctylammonium bromide (ToABr) was found to yield unusually large (∼12,000 μ...
Journal ArticleDOI
Kinetic studies on water-soluble gold nanoparticles coordinated to poly(vinylpyrrolidone): isotropic to anisotropic transformation and morphology
TL;DR: The growth kinetics, isotropic-to-anisotropic transformation, structural properties and surface morphology of polyvinylpyrrolidone (PVP)-coordinated gold nanoparticles are reported in this paper.
Journal ArticleDOI
The effects of size and shape on the structural and thermal stability of platinum nanoparticles
TL;DR: In this article, a new EAM potential was obtained by fitting to the experimental data of bulk Pt, and the cohesive energy, surface energy, structure evolution during the heating process and melting point of Pt nanoparticles with different shapes and sizes were studied with the EAM.
References
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Journal ArticleDOI
Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering
Shuming Nie,Steven R. Emory +1 more
TL;DR: In this article, surface-enhanced Raman scattering was used to detect single molecules and single nanoparticles at room temperature with the use of surface enhanced Raman, and the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15, much larger than the ensemble-averaged values derived from conventional measurements.
Journal ArticleDOI
Shape‐Controlled Synthesis of Metal Nanocrystals: Simple Chemistry Meets Complex Physics?
TL;DR: A comprehensive review of current research activities that center on the shape-controlled synthesis of metal nanocrystals, including a brief introduction to nucleation and growth within the context of metal Nanocrystal synthesis, followed by a discussion of the possible shapes that aMetal nanocrystal might take under different conditions.
Journal ArticleDOI
Local detection of electromagnetic energy transport below the diffraction limit in metal nanoparticle plasmon waveguides.
Stefan A. Maier,Pieter G. Kik,Harry A. Atwater,Sheffer Meltzer,Elad Harel,Bruce E. Koel,Ari A.G. Requicha +6 more
TL;DR: Observations of electromagnetic energy transport from a localized subwavelength source to a localized detector over distances of about 0.5 μm in plasmon waveguides consisting of closely spaced silver rods are presented.
Journal ArticleDOI
Turkevich method for gold nanoparticle synthesis revisited.
TL;DR: It is found that gold particles can be produced in a wide range of sizes, from 9 to 120 nm, with defined size distribution, following the earlier work of Turkevich and Frens.
Journal ArticleDOI
Tight-binding potentials for transition metals and alloys.
Fabrizio Cleri,Vittorio Rosato +1 more
TL;DR: The parameters of many-body potentials for fcc and hcp transition metals, based on the second-moment approximation of a tight-binding Hamiltonian, have been systematically evaluated and good quantitative agreement with the experimental data up to temperatures close to the melting point is found.
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