Confinement effects on optical phonons in spherical, rod-, and tetrapod-shaped nanocrystals detected by Raman spectroscopy

✍ Scribed by Nobile, Concetta ;Kudera, Stefan ;Fiore, Angela ;Carbone, Luigi ;Chilla, Gerwin ;Kipp, Tobias ;Heitmann, Detlef ;Cingolani, Roberto ;Manna, Liberato ;Krahne, Roman

• Book ID: 105364112
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 393 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200673223

✦ Synopsis

Abstract

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)