2008/09/09 by Satyaprakash Sahoo, Sahoo, Satyaprakash, S. Dhara +7
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Ion-surface interactions and analysis #Materials Science (cond-mat.mtrl-sci) #Silicon Nanostructures and Photoluminescence #Spectroscopy Techniques in Biomedical and Chemical Research #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.0809.1543
15 pages, 4 figures, Conf. edision J. Nanoscience and Nanotechnology (In Press)
arxiv created 2008/09/09 · openalex publication_date 2008/09/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Confined acoustic and optical phonons in Si nanoclusters embedded in sapphire, synthesized using ion-beam implantation are investigated using Raman spectroscopy. The l = 0 and l = 2 confined acoustic phonons, found at low Raman shift, are analyzed using complex frequency model and the size of the nanoparticles are estimated as 4 and 6 nm. For the confined optical phonon, in contrast to expected red shift, the Raman line shape shows a substantial blue shift, which is attributed to size dependent compressive stress in the nanoparticles. The calculated Raman line shape for the stressed nanoparticles fits well to data. The sizes of Si nanoparticles obtained using complex frequency model are consistent with the size estimated from the fitting of confined optical phonon line shapes and those found from X-ray diffraction and TEM.