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<p>ZnO thin films are known for their diverse applications in optoelectronics and sensors owing to the wide bandgap of 3.37&#xa0;eV and exciton binding energy of 60&#xa0;meV. When combined with metallic nanoparticles, especially Au, the optical response of ZnO can be substantially modified due to the localized surface plasmon resonance (LSPR) effect. The present work investigates the fabrication of Au-ZnO hybrid structures using radio frequency (RF) magnetron sputtering, followed by thermal treatment at 700&#xa0;°C and 800&#xa0;°C. ZnO thin films were deposited on various substrates such as quartz, bare Si, and Au-coated Si to understand how the underlying Au layer affects structural and optical properties. X Ray diffraction results confirm the evolution of textured, crystalline ZnO structures with a prominent hexagonal wurtzite phase upon post-annealing. FESEM images revealed that the surface formation of nanorods and flower-like features, especially on Au-coated Si substrate. Photoluminescence analysis confirmed stronger and enhanced UV emission and reduced visible emission, attributed to plasmonic interaction effects. Surface-enhanced Raman scattering (SERS) conclusively demonstrates the functional advantage of Au-ZnO structures for molecular detection in the form of amplified Raman signals due to combined chemical and electromagnetic enhancement.</p>

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Plasmon mediated modifications in photoluminescence and surface enhanced Raman scattering from Au-ZnO hybrid nanostructured films

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • B. Mohanarao,
  • P. Babuji,
  • M. Venkaiah,
  • V. Saikiran

摘要

ZnO thin films are known for their diverse applications in optoelectronics and sensors owing to the wide bandgap of 3.37 eV and exciton binding energy of 60 meV. When combined with metallic nanoparticles, especially Au, the optical response of ZnO can be substantially modified due to the localized surface plasmon resonance (LSPR) effect. The present work investigates the fabrication of Au-ZnO hybrid structures using radio frequency (RF) magnetron sputtering, followed by thermal treatment at 700 °C and 800 °C. ZnO thin films were deposited on various substrates such as quartz, bare Si, and Au-coated Si to understand how the underlying Au layer affects structural and optical properties. X Ray diffraction results confirm the evolution of textured, crystalline ZnO structures with a prominent hexagonal wurtzite phase upon post-annealing. FESEM images revealed that the surface formation of nanorods and flower-like features, especially on Au-coated Si substrate. Photoluminescence analysis confirmed stronger and enhanced UV emission and reduced visible emission, attributed to plasmonic interaction effects. Surface-enhanced Raman scattering (SERS) conclusively demonstrates the functional advantage of Au-ZnO structures for molecular detection in the form of amplified Raman signals due to combined chemical and electromagnetic enhancement.