TY - JOUR
T1 - Optical phonon modes in ordered core-shell CdSe/CdS nanorod arrays
AU - Giugni, Andrea
AU - Das, Gobind
AU - Alabastri, Alessandro
AU - Zaccaria, Remo Proietti
AU - Zanella, Marco
AU - Franchini, Isabella
AU - Di Fabrizio, Enzo
AU - Krahne, Roman
PY - 2012/3/12
Y1 - 2012/3/12
N2 - We investigate the optical phonons in "dot-in-a-rod" core-shell CdSe/CdS nanorods at wavelengths resonant with the optical transitions either in the core or in the shell. At a wavelength above the CdS band gap, only CdS phonon modes were detected. In contrast, at excitation in resonance with the core transitions, we observed phonon modes of both the CdSe core and the CdS shell. In laterally ordered nanorod assemblies, the CdS longitudinal-optical phonon mode manifested a low-energy shoulder that could be related to higher-order longitudinal-optical phonon modes. Furthermore, we report on surface-optical modes that originate from the tracklike superstructure of the nanorod assemblies.
AB - We investigate the optical phonons in "dot-in-a-rod" core-shell CdSe/CdS nanorods at wavelengths resonant with the optical transitions either in the core or in the shell. At a wavelength above the CdS band gap, only CdS phonon modes were detected. In contrast, at excitation in resonance with the core transitions, we observed phonon modes of both the CdSe core and the CdS shell. In laterally ordered nanorod assemblies, the CdS longitudinal-optical phonon mode manifested a low-energy shoulder that could be related to higher-order longitudinal-optical phonon modes. Furthermore, we report on surface-optical modes that originate from the tracklike superstructure of the nanorod assemblies.
UR - http://www.scopus.com/inward/record.url?scp=84858418503&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.85.115413
DO - 10.1103/PhysRevB.85.115413
M3 - Article
AN - SCOPUS:84858418503
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 11
M1 - 115413
ER -