Finite-size versus surface effects in nanoparticles
نویسندگان
چکیده
منابع مشابه
Finite-size effects in surface-enhanced Raman scattering in noble-metal nanoparticles: a semiclassical approach.
We study finite-size effects in surface-enhanced Raman scattering (SERS) from molecules adsorbed on small metal particles. Within an electromagnetic description of SERS, the enhancement of the Raman signal originates from the local field of the surface plasmon resonance in a nanoparticle. With decreasing particle sizes, this enhancement is reduced due to the size-dependent Landau damping of the...
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Finite-size and surface effects in fine particle systems are investigated by Monte Carlo simulation of a model of a g-Fe2O3 ~maghemite! single particle. Periodic boundary conditions for a large enough system have been used to simulate the bulk properties and the results compared with those for a spherical shaped particle with free boundaries to evidence the role played by the surface on the ano...
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This chapter is aimed at studying the anomalous magnetic properties (glassy behaviour) observed at low temperatures in nanoparticles of ferrimagnetic oxides. This topic is discussed both from numerical results and experimental data. Ferrimagnetic fine particles show most of the features of glassy systems due to the random distribution of anisotropy axis, interparticle interactions and surface e...
متن کاملSurface plasmon polariton scattering by finite-size nanoparticles
The electromagnetic Green’s tensor approach GTA is used to obtain the differential and total scattering cross sections of a finite-size nanoparticle located at a metal surface and illuminated with surface plasmon polaritons SPPs . The scattering process comprehends either elastic scattering of the incident SPP into other SPPs propagating in different directions or scattering into field componen...
متن کاملFinite-Size Effects and Surface-Enhanced Raman Scattering from Molecules Adsorbed on Noble-Metal Nanoparticles
We study the role of a strong electron confinement on the surface-enhanced Raman scattering from molecules adsorbed on small noble-metal nanoparticles. We describe a novel enhancement mechanism which originates from the different effect that confining potential has on s-band and d-band electrons. We demonstrate that the interplay between finite-size and screening efects in the nanoparticle surf...
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ژورنال
عنوان ژورنال: Journal of Magnetism and Magnetic Materials
سال: 2000
ISSN: 0304-8853
DOI: 10.1016/s0304-8853(00)00390-5