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Theoretical Investigation of Plasmonic Properties of Quantum-Sized Silver Nanoparticles

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Abstract

Plasmonic nanoparticles (NPs) like silver (Ag) strongly absorb the incident light and produce enhanced localized electric field at the localized surface plasmon resonance (LSPR) frequency. Enormous theoretical and experimental research has focused on the plasmonic properties of the metallic nanoparticles with sizes greater than 10 nm. However, such studies on smaller sized NPs in the size range of 3 to 10 nm (quantum-sized regime) are sparse. In this size regime, the conduction band of the metal particles discretizes, thus altering plasmon properties of the NPs from classical to the quantum regime. In this study, plasmonic properties of the spherical Ag NPs in size range of 3 to 20 nm were investigated using both quantum and classical modeling to understand the importance of invoking quantum regime to accurately describing their properties in this size regime. Theoretical calculations using standard Mie theory were carried out to monitor the LSPR peak shift and electric field enhancement as a function of the size of the bare plasmonic nanoparticle and the refractive index (RI) of the surrounding medium. Comparisons were made with and without invoking quantum regime. Also, the optical properties of metallic NPs conjugated with a chemical ligand using multi-layered Mie theory were studied, and interesting trends were observed.

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The physics department of Western Michigan University provided financial support.

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  1. Department of Physics, Western Michigan University, 1903 Western Michigan Avenue, Kalamazoo, MI, 49008, USA

    Masoud Shabaninezhad

  2. Department of Chemistry, Western Michigan University, 1903 Western Michigan Avenue, Kalamazoo, MI, 49008, USA

    Guda Ramakrishna

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  1. Masoud Shabaninezhad
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Shabaninezhad, M., Ramakrishna, G. Theoretical Investigation of Plasmonic Properties of Quantum-Sized Silver Nanoparticles. Plasmonics 15, 783–795 (2020). https://doi.org/10.1007/s11468-019-01102-9

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