Lange Holger, Artemyev Mikhail, Woggon Ulrike, Thomsen Christian
Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany.
Nanotechnology. 2009 Jan 28;20(4):045705. doi: 10.1088/0957-4484/20/4/045705. Epub 2008 Dec 19.
We investigated the geometry dependence of the first-order Raman scattering band of CdSe nanorods experimentally. The band has an asymmetric shape and its position and exact line shape depend on the nanorod diameter and aspect ratio. The band consists of contributions from the longitudinal optical phonon and surface optical phonon modes. While the position of the longitudinal optical phonon related band is purely diameter dependent, the position of the surface optical phonon band depends on the nanorod's aspect ratio. This can be explained by the influence of phonon confinement and a model for surface optical phonons in nanorods.
我们通过实验研究了CdSe纳米棒一阶拉曼散射带的几何依赖性。该谱带具有不对称形状，其位置和精确的线形取决于纳米棒的直径和纵横比。该谱带由纵向光学声子和表面光学声子模式的贡献组成。虽然与纵向光学声子相关的谱带位置仅取决于直径，但表面光学声子谱带的位置取决于纳米棒的纵横比。这可以通过声子限制的影响以及纳米棒中表面光学声子的模型来解释。
