ABSTRACT

Undoped and Ca doped ZnO Wurtzite nanostructures were prepared via sol-gel co-precipitation. Heavy Ca doping causes structural deterioration due to larger ionic radius of Ca²⁺. Strain-induced deformation has been analysed by W-H method. Rietveld analysis has revealed changes in bond length due to doping. Optical transparency and band gap have been determined by UV-Vis and Tauc’s plot, respectively. Band gap is seen to increase with doping. PL study with three different excitation wavelengths, before and after heat treatment of the samples, recommends that 300 nm is the most suitable for obtaining emission in the blue region. SEM has revealed that the low amount of doping causes clustering of particles, but heavy doping reduces it.

摘要

通过溶胶-凝胶共沉淀制备未掺杂和 Ca 掺杂的 ZnO 纤锌矿纳米结构。由于 Ca ^{2+ 的}离子半径较大，Ca 重掺杂会导致结构恶化。用WH方法分析了应变引起的变形。Rietveld 分析揭示了由于掺杂导致的键长变化。光学透明度和带隙分别由 UV-Vis 和 Tauc 曲线确定。可以看到带隙随着掺杂而增加。样品热处理前后三种不同激发波长的 PL 研究建议 300 nm 最适合获得蓝色区域的发射。SEM 表明，低掺杂量会导致粒子聚集，但重掺杂会减少它。