铟催化核壳结构锗纳米线的空间分辨拉曼光谱：尺寸效应

Spatially resolved Raman spectroscopy on indium-catalyzed core-shell germanium nanowires: size effects.

机构信息

Physik Department, Walter Schottky Institut, Technische Universitaet Muenchen, Am Coulombwall 3, D-85748 Garching, Germany.

出版信息

Nanotechnology. 2010 Mar 12;21(10):105703. doi: 10.1088/0957-4484/21/10/105703. Epub 2010 Feb 15.

DOI:10.1088/0957-4484/21/10/105703

PMID:20154375

Abstract

The structure of indium-catalyzed germanium nanowires is investigated by atomic force microscopy, scanning confocal Raman spectroscopy and transmission electron microscopy. The nanowires are formed by a crystalline core and an amorphous shell. We find that the diameter of the crystalline core varies along the nanowire, down to few nanometers. Phonon confinement effects are observed in the regions where the crystalline region is the thinnest. The results are consistent with the thermally insulating behavior of the core-shell nanowires.

摘要

采用原子力显微镜、扫描共焦拉曼光谱和透射电子显微镜研究了铟催化的锗纳米线的结构。纳米线由结晶核和非晶壳组成。我们发现，纳米线的结晶核直径沿其长度方向变化，最小可达几纳米。在结晶区最薄的区域观察到了声子限制效应。这些结果与核壳纳米线的热绝缘行为一致。