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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/02/0207-0216

    • Keywords

       

      Surface-enhanced Raman scattering; magnetic nanoparticles; core-shell nanostructure; bio-diagnosis.

    • Abstract

       

      We report the optimization and usage of surfactantless, water dispersible Ag and Au-coated 𝛾 –Fe2O3 nanoparticles for applications in surface-enhanced Raman scattering (SERS). These nanoparticles, with plasmonic as well as super paramagnetic properties exhibit Raman enhancement factors of the order of 106 (105) for Ag (Au) coating, which are on par with the conventional Ag and Au nanoparticles. Raman markers like 2-naphthalenethiol, rhodamine-B and rhodamine-6G have been adsorbed to these nanoparticles and tested for nonresonant SERS at low concentrations. Further, to confirm the robustness of Ag-coated nanoparticles, we have performed temperaturedependent SERS in the temperature range of 77–473 K. The adsorbed molecules exhibit stable SERS spectra except at temperatures >323 K, where the thermal desorption of test molecule (naphthalenethiol) were evident. The magnetic properties of these nanoparticles combined with SERS provide a wide range of applications.

    • Author Affiliations

       

      G V Pavan Kumar1 N Rangarajan1 B Sonia1 P Deepika1 Nashiour Rohman1 Chandrabhas Narayana1

      1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
    • Dates

       
  • Bulletin of Materials Science | News

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