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Abstract <p>Silver nanoparticles (AgNPs) are most often used as surface-enhanced Raman scattering (SERS) substrates thanks to their surface plasmon resonance, but conventional chemical reduction methods suffer from particle aggregation, poor controllability, and pollution. In this work, we have employed graphene/Cu as a platform for the precision assembly of AgNPs to create AgNPs/graphene/Cu (AgNPs/Gr/Cu), leveraging electron localization and interfacial engineering to promote the controlled reduction of Ag<sup>+</sup> and subsequent Ag deposition. The formation kinetics of AgNPs were systematically investigated and modulated via adjusting solvent polarity, precursor concentration, reaction time and temperature, to establish the correlation between AgNPs morphology and synthesis parameters. Specifically, the hexagonal lattice of graphene facilitated the epitaxial growth of Ag (111), thereby favoring the formation of hexagonal AgNPs. Additionally, the electron transfer between Ag and graphene altered the charge distribution on Ag surface, affecting the deposition/arrangement of Ag atoms and effectively preventing the oxidation/aggregation of AgNPs. The fabricated AgNPs/Gr/Cu manifested superior performance in SERS.</p>

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Synergize Electron Localization-Interface Engineering to Precisely Assemble Ag Nanoparticles/Graphene/Cu with Surface-Enhanced Raman Scattering

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Deyi Kong,
  • Yuehong Lv,
  • Yan Jin,
  • Baoshan Hu,
  • Qian Yang

摘要

Abstract

Silver nanoparticles (AgNPs) are most often used as surface-enhanced Raman scattering (SERS) substrates thanks to their surface plasmon resonance, but conventional chemical reduction methods suffer from particle aggregation, poor controllability, and pollution. In this work, we have employed graphene/Cu as a platform for the precision assembly of AgNPs to create AgNPs/graphene/Cu (AgNPs/Gr/Cu), leveraging electron localization and interfacial engineering to promote the controlled reduction of Ag+ and subsequent Ag deposition. The formation kinetics of AgNPs were systematically investigated and modulated via adjusting solvent polarity, precursor concentration, reaction time and temperature, to establish the correlation between AgNPs morphology and synthesis parameters. Specifically, the hexagonal lattice of graphene facilitated the epitaxial growth of Ag (111), thereby favoring the formation of hexagonal AgNPs. Additionally, the electron transfer between Ag and graphene altered the charge distribution on Ag surface, affecting the deposition/arrangement of Ag atoms and effectively preventing the oxidation/aggregation of AgNPs. The fabricated AgNPs/Gr/Cu manifested superior performance in SERS.