A Raman study of CdSe and ZnSe nanostructures.
Raman studies have been carried out on CdSe nanotubes and ZnSe nanorods produced by surfactant-assisted synthesis. The Raman spectrum of CdSe nanotubes shows modes at 207.5 and 198 cm-1; the former arises from the longitudinal optic phonon mode red-shifted with respect to the bulk mode because of phonon confinement, and the latter is the l = 1 surface phonon. Analysis based on the phonon confinement model demonstrates that the size of the nanoparticle responsible for the red-shift is about 4 nm, close to the estimate from the blue-shift of the photoluminescence. The Raman spectrum of ZnSe nanorods shows modes at 257 and 213 cm-1, assigned to longitudinal and transverse optic phonons, blue-shifted with respect to the bulk ZnSe modes because of compressive strain. The mode at 237 cm-1 is the surface phonon.
Teredesai
Pallavi V
PV
Department of Physics, Indian Institute of Science, Bangalore 560 012, India.
Deepak
F Leonard
FL
Govindaraj
A
A
Sood
A K
AK
Rao
C N
CN
D019187:Cadmium Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification; D008422:Materials Testing / Q000379:methods; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010316:Particle Size; D018036:Selenium Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification; D012666:Semiconductors; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification; D017967:Zinc Compounds / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification
D019187:Cadmium Compounds; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C034939:cadmium sulfide; C044696:zinc selenide