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Confinement effects on optical phonons in spherical, rod‐, and tetrapod‐shaped nanocrystals detected by Raman spectroscopy
Author(s) -
Nobile Concetta,
Kudera Stefan,
Fiore Angela,
Carbone Luigi,
Chilla Gerwin,
Kipp Tobias,
Heitmann Detlef,
Cingolani Roberto,
Manna Liberato,
Krahne Roman
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200673223
Subject(s) - phonon , raman spectroscopy , nanocrystal , rod , spectroscopy , materials science , tetrapod (structure) , position (finance) , condensed matter physics , optics , molecular physics , chemistry , nanotechnology , physics , geology , medicine , paleontology , alternative medicine , finance , pathology , quantum mechanics , economics
Spherical, rod‐ and tetrapod shaped CdSe nanocrystals are investigated by Raman spectroscopy and the longitudinal‐optical and surface optical phonons are observed. We find that the position of the longitudinal‐optical phonon slightly red‐shifts with decreasing diameter, whereas the position of the surface optical phonon depends significantly on diameter and length of the rods or the tetrapod arms. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)