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<p>Ag@ZnO nanorods (ZNRs) and CdS/Ag@ZNRs were successfully synthesized via a hydrothermal route and characterized using X − ray diffraction (XRD), field-emission scanning electron microscopy (FE − SEM), energy-dispersive X − ray (EDX) spectroscopy, ultraviolet − visible (UV − Vis) spectroscopy, and photoluminescence (PL) spectroscopy. XRD analysis confirmed the wurtzite hexagonal structure of ZnO with no secondary impurity phases, while a slight shift in diffraction peaks toward lower angles in Ag@ZnO samples indicated lattice distortion due to Ag incorporation. FE − SEM images revealed vertically aligned ZnO nanorods with an average diameter of approximately 60 ± 5&#xa0;nm for the pristine sample. The diameter slightly increased to about 70 ± 5&#xa0;nm and 100 ± 10&#xa0;nm after Ag and CdS deposition, respectively, which can be attributed to the surface coating effect. EDX confirmed the elemental composition and uniform distribution of Ag and CdS. UV − Vis spectra showed enhanced visible-light absorption and a slight redshift of the absorption edge (2.32&#xa0;eV) for CdS/Ag@ZnO NRs, may arise from to localized surface plasmon resonance (LSPR) effects of Ag nanoparticles and band alignment at the CdS/ZnO interface. PL analysis revealed that Ag doping led to a noticeable quenching of the near-band-edge emission intensity of ZnO, attributed to the introduction of nonradiative recombination centers. After CdS deposition, the PL intensity increased again, likely due to partial recovery of radiative recombination through CdS − ZnO interfacial charge transfer, although it remained slightly lower than that of pristine ZnO. Overall, the CdS/Ag@ZnO heterostructure exhibited tunable emission and interfacial interactions, making it promising for optoelectronic applications where controlled emission and charge separation are essential.</p>

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A simple method for creating an Ag@ZnO nanorods incorporating CdS: CdS/Ag@ZNRs nanocomposite

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Araa Mebdir Holi,
  • Sarah Kamel Khadem

摘要

Ag@ZnO nanorods (ZNRs) and CdS/Ag@ZNRs were successfully synthesized via a hydrothermal route and characterized using X − ray diffraction (XRD), field-emission scanning electron microscopy (FE − SEM), energy-dispersive X − ray (EDX) spectroscopy, ultraviolet − visible (UV − Vis) spectroscopy, and photoluminescence (PL) spectroscopy. XRD analysis confirmed the wurtzite hexagonal structure of ZnO with no secondary impurity phases, while a slight shift in diffraction peaks toward lower angles in Ag@ZnO samples indicated lattice distortion due to Ag incorporation. FE − SEM images revealed vertically aligned ZnO nanorods with an average diameter of approximately 60 ± 5 nm for the pristine sample. The diameter slightly increased to about 70 ± 5 nm and 100 ± 10 nm after Ag and CdS deposition, respectively, which can be attributed to the surface coating effect. EDX confirmed the elemental composition and uniform distribution of Ag and CdS. UV − Vis spectra showed enhanced visible-light absorption and a slight redshift of the absorption edge (2.32 eV) for CdS/Ag@ZnO NRs, may arise from to localized surface plasmon resonance (LSPR) effects of Ag nanoparticles and band alignment at the CdS/ZnO interface. PL analysis revealed that Ag doping led to a noticeable quenching of the near-band-edge emission intensity of ZnO, attributed to the introduction of nonradiative recombination centers. After CdS deposition, the PL intensity increased again, likely due to partial recovery of radiative recombination through CdS − ZnO interfacial charge transfer, although it remained slightly lower than that of pristine ZnO. Overall, the CdS/Ag@ZnO heterostructure exhibited tunable emission and interfacial interactions, making it promising for optoelectronic applications where controlled emission and charge separation are essential.