Ni^(2+)掺杂氧化锌阵列膜的水热合成及性能表征  

Hydrothermal Synthesis and Performance Characterization of Ni^(2+) Doped ZnO Array Films

作　　者：徐晓雷[1] 贺旭涛 符小艺[1] 何新华[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640

出　　处：《人工晶体学报》2014年第3期502-507,共6页Journal of Synthetic Crystals

基　　金：广东省科技计划项目(2007A010500012);国家自然科学基金(21103052)

摘　　要：采用低温水热法制备了Ni2+掺杂的ZnO阵列膜,研究了Ni2+掺杂对样品形貌、晶相结构和光谱特性的影响,并对可能的影响机理进行探讨。结果表明:Ni2+浓度增加不会改变ZnO的纤锌矿结构,但在一定程度上可以起到控制其形貌及均匀度的作用。Ni2+掺杂量x≤0.007 mol/L时,有助于ZnO纳米棒沿c轴方向生长,提高结晶度,但ZnO的生长机理保持不变。Ni2+掺杂量较多时(x>0.007 mol/L),ZnO纳米棒的生长习性发生变化,其六方结构被破坏,水热膜由垂直于基片表面排列的纳米棒阵列转变为由结构不规则的多边形晶粒组成的密堆积排列。由于Ni2+固溶入ZnO晶格产生晶格畸变,引起薄膜内应力以及载流子浓度的变化,使得ZnO拉曼光谱的特征峰出现明显的降低和移动。光致发光谱表明,Ni2+掺杂使ZnO纳米棒的紫外发光峰强度IUV与绿光发光峰强度IGR之比值IUV/IGR增大。Ni2＋ doped ZnO array films were fabricated by low temperature hydrothermal method. The effect of Ni2＋ doping concentration on the morphology, crystalline phase and spectral characteristics of ZnO films was investigated, and the possible growth mechanism was discussed. The results indicate that both the morphology and uniformity of the ZnO nanorods evolve with increasing concentration of Ni2＋ without changing wurtzite structure. When the Ni2＋ concentration x ≤0.007 mol/L, ZnO nanorods grow along c-axis direction, and the quality of crystallisation improves, without changing their growth mechanism. In the presence of more Ni2＋ （x 〉0.007 mo]/L）, the change in growth behavior of ZnO nanorods occurs. Hexagonal structure of ZnO nanorods was destroyed with increasing amount of Ni2＋ doping, resulting in a change in the microstructure of hydrothermally derived ZnO films from nanorod arrays perpendicular to substrate surface to irregular polygonal grains with closed-packed arrangements. The characteristic peak intensity of ZnO decreases and the shift of Raman spectra occurs as a function of Ni-doping content, which are attributed to the variation in both tensile stress within the films and the concentration of carriers resulting from lattice distortion by the incorporation of Ni2 ＋ into the ZnO lattice. The PL spectra exhibits that the intensity ratio of the UV emission to the green emission （Iuv/IGn）increases with increasing Ni content for Ni doped ZnO nanorods.

关 键 词：ZnO阵列膜 水热法 择优取向 

分 类 号：O484[理学—固体物理]