中文摘要：

以Zn（NO3）2·6H2O和Co（NO3）2·6H2O为原料,通过水热法在较低温度下制备了纯ZnO和Co掺杂的ZnO（ZnO：Co）纳米棒.利用XRD、EDS、TEM和HRTEM对样品进行了表征,结合光致发光（PL）谱研究了样品的PL性能.结果表明,水热法制备纯ZnO和ZnO∶Co纳米棒均具有较好的结晶度.Co^2＋是以替代的形式进入ZnO晶格,掺入量为2%（原子分数）左右.纯的ZnO纳米棒平均直径约为20nm,平均长度约为180nm;掺杂样品的平均直径值约为15nm,平均长度约为200nm左右;Co掺杂轻微地影响ZnO纳米棒的生长.另外,Co掺杂能够调整ZnO纳米棒的能带结构、提高表面态含量,进而使得ZnO：Co纳米棒的紫外发光峰位红移,可见光发光能力增强.

英文摘要：

Pure and Co-doped ZnO nanorods were synthesized by hydrothermal method at low temperature using Zn（NO3）2·6H2O and Co（NO3）2·6H2O as raw materials. The as-prepared samples were studied by XRD, EDS, TEM, and HRTEM, the photoluminescence （PL） property of the samples was principally investigated by PL spectroscopy. The results showed that the crystallinities of pure and ZnO：Co nanorods were rather well. Co atoms substituted Zn atoms positions to incorporate into nanocrystal, the dopant content was about 2% （atomic fraction）. The average diameter and length of pure ZnO nanorods were about 20 and 180 nm, whereas the corresponding parameters of doped nanorods were respectively about 15 and 200 nm. This indicated that Co doping could influence the growth of ZnO nanorods. In addition, the Co doping could tune the energy level structure and enrich the surface states of ZnO nanorods, which led to emission peak redshift in UV region and luminescence enhancement in visible light region.