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Influence of Ni and Sr on the structural, morphological and optical properties of ZnO synthesized by sol gel

机译：Ni和Sr对溶胶凝胶合成ZnO的结构，形貌和光学性质的影响

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ZnO nanoparticles doped and co-doped with Ni and Sr were synthesized by the sol gel method. Rietveld refinement indicated the single phase of ZnO for all the samples and suggests that the variations in structural parameters are dependent on the ions type. Fourier transform infrared studies showed the functional groups and chemical bonding of ZnO and confirmed the replacement of Zn by Ni and Sr ions. The micrographs showed particles with clusters shapes and different sizes. Photoluminescence measurements show a shift in near band edge UV emission, from 380 to 384 nm for doped and co-doped samples. Additionally, the Zn substitution by Ni and Sr ions minimizes the intrinsic defects in the ZnO structure. The optical study showed that the replacement of Zn by Ni decreases the band gap, whereas the substitution by Sr increases it. For co-doped samples, this value depends on the dopant concentration and the ions type. This work contributes to the understanding of optical properties for the ZnO nanoparticles co-doping with Ni and Sr, which may be important for future applications.
机译：通过溶胶凝胶法合成了掺有Ni和Sr的ZnO纳米颗粒。 Rietveld精炼表明所有样品均为ZnO单相，并暗示结构参数的变化取决于离子类型。傅里叶变换红外研究显示了ZnO的官能团和化学键，并证实了Ni和Sr离子替代了Zn。显微照片显示出具有团簇形状和不同尺寸的颗粒。光致发光测量表明，对于掺杂和共掺杂的样品，近谱带边缘的紫外线发射从380 nm变为384 nm。此外，Ni和Sr离子取代Zn可使ZnO结构中的固有缺陷最小化。光学研究表明，Ni取代Zn会减小带隙，而Sr取代会增加带隙。对于共掺杂样品，该值取决于掺杂剂浓度和离子类型。这项工作有助于理解与Ni和Sr共掺杂的ZnO纳米粒子的光学性质，这对于将来的应用可能很重要。

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