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Effect of low energy Ag+ ION implantation ON ZnO nanorods for enhanced visible light absorption- structural and optical analysis
Optical Materials ( IF 3.9 ) Pub Date : 2021-12-01 , DOI: 10.1016/j.optmat.2021.111757
Kebadiretse Lefatshe 1 , Cosmas Muiva 1 , Morgan Madhuku 2
Affiliation  

Nanostructured one-dimensional ZnO nanorods (NRs) were grown on seeded borosilicate glass substrates through chemical bath deposition. The synthesised ZnO NRs were implanted with Ag + ions at low energy of 50 keV and varying fluences of 1 × 1015, 2 × 1015, 3 × 1015, 1 × 1016, and 3 × 1016 ions/cm2. The influence of injected Ag + ions was investigated on the structural and optical properties of ZnO NRs. A variation of X-ray diffraction (XRD) extracted and calculated microstructural parameters confirmed the presence of Ag+ ions on the grown ZnO NRs. XRD and Raman analysis revealed that the hexagonal wurtzite structure of ZnO was maintained, even at elevated fluences of Ag+ ions. Peak shifting to higher angles and lattice expansion were observed and attributed to substitutional doping. A red shift was observed in the absorbance spectra of Ag+ implanted ZnO NRs, suggesting a possibility of modification of the electronic structure which was confirmed through a calculation of the optical band gap and the refractive index. The energy band gap of Ag+ ion implanted ZnO NRs decreased with increase in the Ag+ ion fluence, whereas an increase was found for the calculated refractive index. The ZnO NRs implanted with 3 × 1016 ions/cm2 depicted different behaviour for structural and optical analysis, indicating a possibility of saturation of point defects and formation of different type of defects at fluences above 1 × 1016 ions/cm2. Corroboration of the structural and optical parameters demonstrate that low energy Ag + ion implantation can provide an effective and efficient approach to modify the structural and optoelectronic properties of ZnO for visible light driven photocatalytic applications.



中文翻译:

低能Ag+离子注入对ZnO纳米棒增强可见光吸收的影响-结构和光学分析

纳米结构的一维 ZnO 纳米棒 (NRs) 通过化学浴沉积在接种的硼硅酸盐玻璃基板上生长。合成的 ZnO NRs 以 50 keV 的低能量和 1 × 10 15、2 × 10 15、3 × 10 15、1 × 10 16和 3 × 10 16离子/cm 2 的不同通量注入 Ag  +离子。研究了注入的 Ag  + 离子对 ZnO NRs 的结构和光学性质的影响。X 射线衍射 (XRD) 提取和计算的微观结构参数的变化证实了 Ag +生长的 ZnO NRs 上的离子。XRD 和拉曼分析表明,即使在提高 Ag +离子通量的情况下,ZnO 的六方纤锌矿结构也保持不变。观察到峰移至更高角度和晶格膨胀,这归因于置换掺杂。在 Ag +注入的 ZnO NRs的吸收光谱中观察到红移,表明通过计算光学带隙和折射率证实了电子结构的修改的可能性。Ag +离子注入的 ZnO NRs的能带隙随着 Ag +离子注量的增加而减小,而计算出的折射率则增加。以 3 × 10 16离子/cm注入的 ZnO NRs图 2描绘了结构和光学分析的不同行为,表明在超过 1 × 10 16离子/cm 2 的能量密度下点缺陷有可能饱和并形成不同类型的缺陷。结构和光学参数的证实表明,低能 Ag  + 离子注入可以提供一种有效且高效的方法来改变 ZnO 的结构和光电特性,以用于可见光驱动的光催化应用。

更新日期:2021-12-01
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