Co掺杂对ZnO纳米棒阵列的结构和性质的影响

The effect of Co-doping on the structures and photoluminescence of ZnO nanorod arrays

通过70℃水热反应制备高密度排列的Zn1-xCoxO(x=0.05,0.10和0.15,统记为ZnCoO)纳米棒阵列,用X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、X射线光电子能谱(XPS)和光致发光光谱(PL)进行表征.结果表明:Co2+替代Zn2+掺入了ZnO的晶格中,纳米棒沿[0001]方向垂直生长在含ZnO种子层的玻璃上,纳米棒平均直径约为150nm,长4.5μm.ZnO种子层和Co掺杂在ZnCoO纳米棒成核和择优生长中起着重要作用.PL光谱是由宽紫外光带(UV)和可见光(VL)构成.ZnCoO纳米棒阵列UV峰位与纯ZnO的相比发生了蓝移.随着Co含量的增加,UV峰明显宽化并发生红移.文中对紫外峰的宽化和红移起因以及ZnCoO阵列的形成机制进行了讨论.

High density of ZnCoO nanorod arrays were prepared via hydrothermal reaction at 70 ℃,which were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectrum（XPS）,field emission scan electron microscope（FESEM） and photoluminescence（PL） .The nanorods with 150 nm in average diameter and 4.5 μm in length growing along [0001] direction had been observed,which vertically grew on glass coated with ZnO film,and in which Co2 ＋ substituting Zn2 ＋ doped into ZnO crystal lattice.ZnO seed layer and in which Co doping were found to play a very important role in the nucleation and growth of ZnCoO nanorods.PL spectra consists of ultraviolet emission band（UV） and visible light emission band（VL） .The UV peak position of ZnCoO nanorod arrays blueshifts in comparision to that of pure ZnO prepared at the Same condition.With increase of Co content,UV peak obviously widened and redshifted.This phenomena and the formation mechanism of ZnCoO arrays were also discussed.