Confocal micro-Raman observation of nanometer thick oxide layers on metal nanoparticles.
It is shown for the first time that confocal micro-Raman spectroscopy can be used to detect metal oxide nanometer thick layers on metal nanoparticles. The measured frequencies of the observed oxide layers are shifted to lower frequencies and the line widths were asymmetrically broadened compared to Raman spectrum in bulk oxide of the metals. The effects are due to phonon confinement which occurs in materials of nanometer dimensions. Models of phonon confinement are used to estimate the thickness of the oxide layers.
Owens
Frank J
FJ
Department Physics, Hunter College, CUNY, 695 Park Ave., New York, NY 10021, USA.
Reddingius
B
B
D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D008670:Metals / Q000032:analysis / Q000737:chemistry*; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
D020099:Coated Materials, Biocompatible; D008670:Metals; D010087:Oxides