Teredesai Pallavi V, Deepak F Leonard, Govindaraj A, Sood A K, Rao C N
Department of Physics, Indian Institute of Science, Bangalore 560 012, India.
J Nanosci Nanotechnol. 2002 Oct;2(5):495-8. doi: 10.1166/153348802760394061.
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.
已对通过表面活性剂辅助合成制备的CdSe纳米管和ZnSe纳米棒进行了拉曼研究。CdSe纳米管的拉曼光谱在207.5和198 cm-1处显示出模式；前者源于纵向光学声子模式，由于声子限制相对于体模式发生红移，后者是l = 1表面声子。基于声子限制模型的分析表明，导致红移的纳米颗粒尺寸约为4 nm，接近从光致发光蓝移得出的估计值。ZnSe纳米棒的拉曼光谱在257和213 cm-1处显示出模式，分别归属于纵向和横向光学声子，由于压缩应变相对于体ZnSe模式发生蓝移。237 cm-1处的模式是表面声子。
