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<p>In this work, a gold (Au) nanoparticle created as a core that has been surrounded by copper oxide (CuO) nanoshells (Au@CuO core@shell) is accomplished through the use of pulsed laser ablation in liquid (PLAL). The core@shell form of Au@CuO particles has been synthesized by employing different pulsed laser ablation energies, and then, the nanoparticles are subsequently integrated into porous silicon (PS) substrates. The X-ray diffraction experiments conducted on Au@CuO nanostructures have revealed a phase consistent with a cubic crystalline structure for the Au nanoparticles. In contrast, CuO nanoparticles are characterized by a monoclinic crystal structure. As the scanning electron microscopy (SEM) images show, the Au@CuO nanostructures comprise spherical grains that are randomly scattered. Still, the PS nanostructures have an architecture that functions like a sponge. Core–shell nanoparticles with an energy of 1200 mJ, created using laser pulses, exhibit a distribution of particle sizes with an average diameter of 41 nm, as shown in transmission electron microscopy (TEM) images from the experiment. The core–shell arrangement in the CuO nanoshell is confirmed by TEM pictures, which also show the considerably lighter outside area of a copper oxide nanoshell and the dark inner section for gold nanoparticles. UV–Visible spectroscopy, including absorption and photoluminescence methodologies, was utilized. Depending on the results, it can be concluded that variations in the energy from the laser used in the initial sample preparation phase are related to variations in the energy gap. The photoluminescence and UV–visible absorbance analysis revealed that the band gap energies range between 2.53 and 2.82&#xa0;eV, and these values vary with the laser energy. Furthermore, when Au@CuO nanoparticles were added to PS samples, the sensitivity (<i>R</i><sub>λ</sub>) was significantly higher than when a sample made entirely of porous silicon was used. The maximal response of the Au@CuO-NPs/PS photodetector manufactured at 1200&#xa0;mJ was demonstrated to be 0.194 A/W at a wavelength of 548&#xa0;nm. Au@CuO nanoparticles can absorb light through wavelengths ranging from near-infrared to visible.</p>

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Enhancing the Spectral Responsivity of Au@CuO (core@shell) Nanoparticles via Laser Ablation Deposited on Porous Silicon

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Jabbar H. Khlaief,
  • Uday M. Nayef,
  • Adi M. Abdul Hussien

摘要

In this work, a gold (Au) nanoparticle created as a core that has been surrounded by copper oxide (CuO) nanoshells (Au@CuO core@shell) is accomplished through the use of pulsed laser ablation in liquid (PLAL). The core@shell form of Au@CuO particles has been synthesized by employing different pulsed laser ablation energies, and then, the nanoparticles are subsequently integrated into porous silicon (PS) substrates. The X-ray diffraction experiments conducted on Au@CuO nanostructures have revealed a phase consistent with a cubic crystalline structure for the Au nanoparticles. In contrast, CuO nanoparticles are characterized by a monoclinic crystal structure. As the scanning electron microscopy (SEM) images show, the Au@CuO nanostructures comprise spherical grains that are randomly scattered. Still, the PS nanostructures have an architecture that functions like a sponge. Core–shell nanoparticles with an energy of 1200 mJ, created using laser pulses, exhibit a distribution of particle sizes with an average diameter of 41 nm, as shown in transmission electron microscopy (TEM) images from the experiment. The core–shell arrangement in the CuO nanoshell is confirmed by TEM pictures, which also show the considerably lighter outside area of a copper oxide nanoshell and the dark inner section for gold nanoparticles. UV–Visible spectroscopy, including absorption and photoluminescence methodologies, was utilized. Depending on the results, it can be concluded that variations in the energy from the laser used in the initial sample preparation phase are related to variations in the energy gap. The photoluminescence and UV–visible absorbance analysis revealed that the band gap energies range between 2.53 and 2.82 eV, and these values vary with the laser energy. Furthermore, when Au@CuO nanoparticles were added to PS samples, the sensitivity (Rλ) was significantly higher than when a sample made entirely of porous silicon was used. The maximal response of the Au@CuO-NPs/PS photodetector manufactured at 1200 mJ was demonstrated to be 0.194 A/W at a wavelength of 548 nm. Au@CuO nanoparticles can absorb light through wavelengths ranging from near-infrared to visible.