Behavior of porous silicon crystallite size analized by Raman spectroscopy and phonon confinement model

Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model.

Analysis of the size distribution of nanocrystals is a critical requirement for the processing and optimization of their size-dependent properties. The common techniques used for the size analysis are transmission electron microscopy (TEM), X-ray diffraction (XRD) and photoluminescence spectroscopy (PL). These techniques, however, are not suitable for analyzing the nanocrystal size distribution...

Structures and coalescence behavior of size-selected silicon nanoclusters studied by surface-plasmon-polariton enhanced Raman spectroscopy

The structures and coalescence behavior of size-selected, matrix-isolated silicon clusters have been studied using surface-plasmon-polariton ~SPP! enhanced Raman spectroscopy. The cluster ions were produced in a laser vaporization source, mass selected then deposited into a co-condensed matrix of Ar, Kr or N2 on a liquid He cooled substrate. Raman spectra from monodisperse samples of the smalle...

Investigation of phonon behavior in Pr(2)NiMnO(6) by micro-Raman spectroscopy.

The temperature dependence of phonon excitations and the presence of spin-phonon coupling in polycrystalline Pr(2)NiMnO(6) samples were studied using micro-Raman spectroscopy and magnetometry. Magnetic properties show a single ferromagnetic-to-paramagnetic transition at 228 K and a saturation magnetization close to 4.95 µ(B)/f.u. Three distinct Raman modes at 657, 642, and 511 cm( - 1) are obse...

Phonon Conduction in Periodically Porous Silicon Nanobridges

Raman spectroscopy of silicon nanowires

We measure the effects of phonon confinement on the Raman spectra of silicon nanowires. We show how previous spectra were inconsistent with phonon confinement, but were due to intense local heating caused by the laser. This is peculiar to nanostructures, and would require orders of magnitude more power in bulk Si. By working at very low laser powers, we identify the contribution of pure confine...