Wu Jian, Gutierrez H R, Eklund P C
Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
J Nanosci Nanotechnol. 2008 Jan;8(1):393-9.
The growth of Diluted Magnetic Semiconducting (DMS) Zn(1-x)Mn(x)S (0 < or = x < 0.6) nanowires (NWs) using a three-zone furnace and two solid sources is reported. The approach is generally applicable to many binary and ternary NW systems that grow by the Vapor-Liquid-Solid growth mechanism. Mn concentration was controlled by the temperature of the Mn source. The Zn/Mn ratio was found to determine the crystalline structure, i.e., wurtzite or zinc blende. High-resolution transmission electron microscopy measurements revealed highly crystalline single phase NWs. The vibrational properties of the DMS NWs with different Zn/Mn ratios were studied by correlating their Raman scattering spectra with the composition measured by Energy Dispersive X-Ray Spectroscopy (EDS). We find that the transverse optical (TO) phonon band disappears at the lowest Mn concentrations, while the longitudinal optical (LO) phonon band position was found insensitive to x. Three additional Raman bands were observed between the ZnS q = 0 TO and LO phonons when Mn atoms were present in the NWs. These bands are similar to those reported previously for bulk Zn(1-x)Mn(x)S and their origin is still controversial.
报道了使用三区炉和两种固体源生长稀磁半导体（DMS）Zn(1-x)Mn(x)S（0≤x＜0.6）纳米线（NWs）的情况。该方法通常适用于许多通过气-液-固生长机制生长的二元和三元NW系统。Mn浓度由Mn源的温度控制。发现Zn/Mn比决定晶体结构，即纤锌矿或闪锌矿。高分辨率透射电子显微镜测量显示出高度结晶的单相NWs。通过将不同Zn/Mn比的DMS NWs的拉曼散射光谱与能量色散X射线光谱（EDS）测量的成分相关联，研究了它们的振动特性。我们发现，在最低的Mn浓度下，横向光学（TO）声子带消失，而纵向光学（LO）声子带位置对x不敏感。当NWs中存在Mn原子时，在ZnS的q = 0 TO和LO声子之间观察到另外三个拉曼带。这些带与先前报道的块状Zn(1-x)Mn(x)S的带相似，其起源仍存在争议。
