4.8 Article

Surface Plasmon Tunability of Core-Shell Au@Mo6 Nanoparticles by Shell Thickness Modification

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 9, Pages 2150-2157

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03853

Keywords

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Funding

  1. Japan Society for the Promotion of Science (JSPS) through KAKENHI [20H02624]
  2. JSPS [JP18F18797]
  3. JSPS Kakenhi [21K13868]
  4. Grants-in-Aid for Scientific Research [21K13868, 20H02624] Funding Source: KAKEN

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In this study, we investigated the plasmon resonances of core-shell Au@Mo-6 nanoparticles and found that the plasmon resonance energy can be controlled by varying the thickness of the Mo-6 cluster shells. Our experimental results were supported by numerical simulations.
Plasmon resonances of noble metal nanoparticles are used to enhance light-matter interactions in the nanoworld. The nanoparticles' optical response depends strongly on the dielectric permittivity of the surrounding medium. We show that the plasmon resonance energy of core-shell Au@Mo-6 nanoparticles can be tuned from 2.4 to 1.6 eV by varying the thickness of their Mo-6 cluster shells between zero and 70 nm, when the core diameter is fixed at 100 nm. We probe their plasmonic response by performing nanometer-resolution plasmon mapping on individual nanoparticles, using electron energy-loss spectroscopy inside a transmission electron microscope. Our experimental results are corroborated by numerical simulations performed using boundary element methods. The simulations predict a similar dependency for the extinction energy, showing that this effect could also be observed by light-optical experiments outside the electron microscope, although limited by the size distribution of the nanoparticles in solution and the substantial scattering effects.

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