尖晶石结构Ni掺杂ZnFe2O4纳米颗粒的性能表征

Property characterization of spinel structure Ni-doped ZnFe2O4 nanoparticles

利用水热法成功合成了纯ZnFe2O4和不同含量Ni掺杂Zn1-xNixFe2O4纳米颗粒。采用X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)、选区电子衍射(SAED)、X射线能量色散分析(XEDS)、紫外可见吸收光谱(UV-Vis)、傅里叶变换红外光谱(FT-IR)和振动样品磁强计(VSM)等测试技术研究掺杂浓度对Zn1-xNixFe2O4(x=0,0.1,0.3,0.5)样品的晶体结构、形貌、光学性能和磁学性能的影响。结果表明:所制备的Zn1-xNixFe2O4纳米颗粒结晶良好,Ni2+以替代Zn2+的形式掺杂到ZnFe2O4晶格中,生成立方尖晶石结构ZnFe2O4。随着Ni含量的增加,晶粒尺寸增大,晶格常数发生收缩。样品的形貌呈不规则的椭球形,且颗粒大小比较均匀。红外光谱的吸收峰位置并没有随Ni掺杂浓度的增加而变化。Zn1-xNixFe2O4纳米晶的光学带隙随Ni掺杂浓度增加而增大,与相应块体相比发生蓝移。在室温下,纯ZnFe2O4纳米晶呈现超顺磁性,掺杂样品具有明显的铁磁性。

Pure and Ni-doped Zn1-xNixFe2O4 nanoparticles with different contents were successfully prepared via hydrothermal method.The influence of nickel doping concentration on the microstructure,morphology,optical and magnetic properties of Zn1-xNixFe2O4(x=0,0.1,0.3,0.5)nanocrystals were characterized by X-ray diffraction(XRD),high-resolution transmission electron microscopy(HRTEM),selected area electron diffraction(SAED),X-ray energy dispersive spectroscopy(XEDS),ultraviolet-visible absorption spectrum(UV-Vis),Fourier transform infrared spectroscopy(FT-IR)and the vibrating sample magnetometer(VSM)and etc.The results show that all Zn1-xNixFe2O4 nanoparticles are with good crystallization,Ni 2+enters into ZnFe2O4 lattice in the form of replacing Zn 2+,and generating cubic spinel structure ZnFe2O4.With the increase of Ni content,the crystalline size increases and the lattice constant shrinks.The morphology of the samples exhibits irregular ellipsoid with uniform particle size.The absorption peak position of FT-IR spectra does not change with the increase of Ni doping concentration.The energy band gap of Zn1-xNixFe2O4 nanocrystals increases with the increase of Ni doping concentration,and blue shift occurs compared with the corresponding bulk.Pure ZnFe2O4 nanocrystals exhibit super paramagnetic properties and the doped samples show obvious ferromagnetism at room temperature.