Effect of low energy Ag+ ION implantation ON ZnO nanorods for enhanced visible light absorption- structural and optical analysis

Kebadiretse Lefatshe, Cosmas Muiva, Morgan Madhuku

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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.

Original languageEnglish
Article number111757
JournalOptical Materials
Publication statusPublished - Dec 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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