Zn/ZnO纳米颗粒的表面声子Raman散射

Ｚｎ／ＺｎＯ纳米颗粒的表面声子Ｒａｍａｎ散射许建峰黄亚彬莫育俊（河南大学物理系开封４７５００１）ＲａｍａｎＳｃａｔｅｒｉｎｇｆｒｏｍＳｕｒｆａｃｅＰｈｏｎｏｎｓｉｎＺｎ／ＺｎＯＮａｎｏｐａｒｔｉｃｌｅｓＸｕＪｉａｎｆｅｎｇ，ＨｕａｎｇＹａｂｉｎ，Ｍｏ...

Raman Scattering from Surface Phonons in Zn/ZnO Nanoparticles

Abstract Using a gas evaporation technique with an induction heating method, Zn nanoparticles were prepared. Transmission electron miscroscopic observations showed that Zn particles with spherical form are about 80 nm in diameter. X ray diffraction and XPS revealed that the particle is composed of a Zn core and a ZnO coating. Raman scattering from the Zn fine spherical particles coated with ZnO of variable thickness was measured, and a broad peak was observed. The Raman peak shifts to the lower frequency side with the increase of oxide thickness. To explain the experimental results, the frequencies of the optical surface phonons of a metallic sphere with a dielectric coating were derived. From a comparison of experimental results with theoretical analysis, it was concluded that the broad Raman peak comes from the surface phonon scattering.