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<p>This study demonstrates an effective approach for the preparation of hybrid (Au@Nb<sub>2</sub>O<sub>5</sub>) nanoparticles through pulsed laser ablation in liquids (PLAL), using gold and niobium targets immersed in double-distilled water. This research evaluated the impact of varying laser fluence on material preparation, with a comprehensive analysis of the optical, structural, morphological, and chemical properties of the material. X-ray diffraction results confirm the formation of a polycrystalline structure in the material. We found an orthorhombic T-Nb<sub>2</sub>O<sub>5</sub> structure in the Au@Nb<sub>2</sub>O<sub>5</sub> NPs. The crystal structure results were confirmed by Raman spectra of the molecules, which showed the presence of scattering bands for both phases T-Nb<sub>2</sub>O<sub>5</sub> and H-Nb<sub>2</sub>O<sub>5</sub>.The PL study indicates that the band gap energy and visual absorption of Nb<sub>2</sub>O<sub>5</sub> nanoparticles are modified by varying laser fluence, resulting in a reduction from 2.28 to 1.82&#xa0;eV. The structure and morphology of Au@Nb<sub>2</sub>O<sub>5</sub> core–shell nanocomposites were revealed by FE-SEM studies. The Fourier transform infrared spectroscopy revealed absorption peaks at 1384.37, 1162.32, and 1059.35&#xa0;cm<sup>–1</sup>, which are associated with the symmetric (Nb–O-Nb metal-oxide-metal modes stretching vibration. The electrical resistance values decrease with increasing laser fluence intensity from 149 to 52 kΩ.</p>

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Controlling the Properties of Gold-Niobium Pentoxide (Au@Nb2O5) Core–Shell by Laser Intensity During Preparation: An Optical, Morphological, and Structural Study

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Mohammed Moslih Mahdi,
  • Evan T. Salim,
  • Ahmed S. Obaid

摘要

This study demonstrates an effective approach for the preparation of hybrid (Au@Nb2O5) nanoparticles through pulsed laser ablation in liquids (PLAL), using gold and niobium targets immersed in double-distilled water. This research evaluated the impact of varying laser fluence on material preparation, with a comprehensive analysis of the optical, structural, morphological, and chemical properties of the material. X-ray diffraction results confirm the formation of a polycrystalline structure in the material. We found an orthorhombic T-Nb2O5 structure in the Au@Nb2O5 NPs. The crystal structure results were confirmed by Raman spectra of the molecules, which showed the presence of scattering bands for both phases T-Nb2O5 and H-Nb2O5.The PL study indicates that the band gap energy and visual absorption of Nb2O5 nanoparticles are modified by varying laser fluence, resulting in a reduction from 2.28 to 1.82 eV. The structure and morphology of Au@Nb2O5 core–shell nanocomposites were revealed by FE-SEM studies. The Fourier transform infrared spectroscopy revealed absorption peaks at 1384.37, 1162.32, and 1059.35 cm–1, which are associated with the symmetric (Nb–O-Nb metal-oxide-metal modes stretching vibration. The electrical resistance values decrease with increasing laser fluence intensity from 149 to 52 kΩ.