Magnesium Nanoparticle Plasmonics

Biggings, John, S. and Yazdi, Sadegh and Ringe, Emilie (2018) Magnesium Nanoparticle Plasmonics. Nano Letters, 18 (6). pp. 3752-3758. ISSN 1530-6984 DOI https://doi.org/10.1021/acs.nanolett.8b00955

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Abstract

Nanoparticles of some metals (Cu/Ag/Au) sustain oscillations of their electron cloud called localized surface plasmon resonances (LSPRs). These resonances can occur at optical frequencies and be driven by light, generating enhanced electric fields and spectacular photon scattering. However, current plasmonic metals are rare, expensive, and have a limited resonant frequency range. Recently, much attention has been focused on earth-abundant Al, but Al nanoparticles cannot resonate in the IR. The earth-abundant Mg nanoparticles reported here surmount this limitation. A colloidal synthesis forms hexagonal nanoplates, reflecting Mg’s simple hexagonal lattice. The NPs form a thin self-limiting oxide layer that renders them stable suspended in 2-propanol solution for months and dry in air for at least two week. They sustain LSPRs observable in the far-field by optical scattering spectroscopy. Electron energy loss spectroscopy experiments and simulations reveal multiple size-dependent resonances with energies across the UV, visible, and IR. The symmetry of the modes and their interaction with the underlying substrate are studied using numerical methods. Colloidally synthesized Mg thus offers a route to inexpensive, stable nanoparticles with novel shapes and resonances spanning the entire UV-vis-NIR spectrum, making them a flexible addition to the nanoplasmonics toolbox.

Item Type:	Article
Uncontrolled Keywords:	2018AREP; IA73
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Nano Letters
Volume:	18
Page Range:	pp. 3752-3758
Identification Number:	https://doi.org/10.1021/acs.nanolett.8b00955
Depositing User:	Sarah Humbert
Date Deposited:	04 Oct 2018 21:34
Last Modified:	04 Oct 2018 21:34
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4331

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