Co掺杂ZnAl2O4纳米颗粒的制备与光学性质研究

Preparation and optical properties of Co doped ZnAl2O4 nanoparticles

摘要:

以CTAB为表面活性剂，采用水热法成功制备了不同掺杂比例的Zn1-xCoxAl2O4（x=0，0.20，0.40和0.60）纳米晶。并对样品的晶体结构、形貌、化学成分、价态和光学性能进行表征。实验结果表明，本方法所制备的不同掺杂浓度的Zn1-xCoxAl2O4纳米颗粒为尖晶石结构，晶化程度良好。根据XRD数据计算了晶胞参数a、晶格间距dhkl、晶粒尺寸D，随着掺杂Co离子浓度的增加，均表现为减小趋势。XPS能谱显示大多数Co离子占据四面体中心位置，但有少量的Co离子占据八面体中心位置。随着掺杂Co离子浓度的增加，紫外吸收光的强度逐渐增加。

Abstract:

Zn1-xCoxAl2O4 (x=0, 0.20, 0.40 and 0.60) nanocrystals were successfully prepared via hydrothermal method using CTAB as surface active agent. The crystal structure, morphology, chemical composition, valence state and optical properties of the sample were investigated. The experimental results show that the samples are single phase spinel structure with good crystallization. According to the XRD data, the value of the crystal cell parameters, lattice spacing dhkl and grain size D were calculated, which show the decrease trend with the increase of doping concentration of Co ions. The XPS result clearly shows that the Co ions mainly occupied the tetrahedral site and a small amount of Co ions occupied octahedral center position. With the increasing of Co ions concentration, the ultraviolet absorption intensity is gradually increased.