Tailoring Plasmonics of Au@Ag Nanoparticles by Silica Encapsulation

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2021
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Schultz, Johannes
Potapov, Pavel
Büchner, Bernd
Lubk, Axel
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Hybrid metallic nanoparticles (NPs) encapsulated in oxide shells are currently intensely studied for plasmonic applications in sensing, medicine, catalysis, and photovoltaics. Here, a method for the synthesis of Au@Ag@SiO2 cubes with a uniform silica shell of variable and adjustable thickness in the nanometer range is introduced and their excellent, highly reproducible, and tunable optical response is demonstrated. Varying the silica shell thickness, the excitation energies of the single NP plasmon modes can be tuned in a broad spectral range between 2.55 and 3.25 eV. Most importantly, a strong coherent coupling of the surface plasmons is revealed at the silver–silica interface with Mie resonances at the silica–vacuum interface leading to a significant field enhancement at the encapsulated NP surface in the range of 100% at shell thicknesses t ≃ 20 nm. Consequently, the synthesis method and the field enhancement open pathways to a widespread use of silver NPs in plasmonic applications including photonic crystals and may be transferred to other non-precious metals.

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ISO 690SCHULTZ, Johannes, Felizitas KIRNER, Pavel POTAPOV, Bernd BÜCHNER, Axel LUBK, Elena V. STURM, 2021. Tailoring Plasmonics of Au@Ag Nanoparticles by Silica Encapsulation. In: Advanced Optical Materials. Wiley. 2021, 9(22), pp. 2101221. ISSN 2195-1071. eISSN 2195-1071. Available under: doi: 10.1002/adom.202101221
BibTex
@article{Schultz2021-11Tailo-55112,
  year={2021},
  doi={10.1002/adom.202101221},
  title={Tailoring Plasmonics of AuAg Nanoparticles by Silica Encapsulation},
  number={22},
  volume={9},
  issn={2195-1071},
  journal={Advanced Optical Materials},
  author={Schultz, Johannes and Kirner, Felizitas and Potapov, Pavel and Büchner, Bernd and Lubk, Axel and Sturm, Elena V.}
}
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