溶胶-凝胶法制备Co掺杂ZnO纳米粉体光学性能

Optical Properties of Co-doped ZnO Nanopowder by Sol-Gel Method

以六水硝酸锌、乙二醇甲醚、硝酸钴为原料,乙醇胺为稳定剂,利用溶胶-凝胶法成功地制备了掺杂Co离子的氧化锌(ZnO)纳米粉体,研究了过渡金属离子Co的掺杂浓度和热处理温度对ZnO的晶体结构、形貌、光致发光等性能的影响。结果表明,合成的粉体ZnO纤锌矿结构,粒径大小约(15~20)nm,且随热处理温度的增加衍射峰强度逐渐增加,粒度逐渐增大,并在(101)面择优生长。光致发光(PL)谱显示,在紫外-可见光区具有很强的发光峰,随热处理温度和掺杂浓度的不同而发生变化,Zn离子与掺杂的Co离子的摩尔比为100∶2,500℃热处理时发光峰强度最高。

The Co-doped ZnO nanopowders were synthesized by Sol-Gel method with analytical grade zinc nit rate hexahydrate Zn（NO3）2·6 H2 O,C3 H8 O2 and cobalt acetate Co（NO3）2 as raw materials and C2 H7 NO as stabilizers.The effects of the dopant concentration of the transition metal ions Co and the annealing temperature on the crystal structure,morphology and photoluminescence performance of ZnO were investigated.The results indicate that ZnO nanopowders have cubic zinc hexagonal wurtzite structure,and the size of these spherical particles is about（15~20）nm.The diffraction peak intensity and particle size will increase gradually as the increasing of annealing temperature which has completed（101）preferred growth.The photoluminescence（PL）spectra showed that there was a strong glow peak in the ultraviolet-visible light which changed with different dopant concentration and annealing temperature.The molar ratio of Zn ions to doped Co ions is 100∶2,the peak intensity of luminescence in the highest at 500 ℃.