Size Control in the Colloidal Synthesis of Plasmonic Magnesium Nanoparticles

Hopper, Elizabeth R. and Wayman, Thomas M. R. and Asselin, Jérémie and Pinho, Bruno and Boukouvala, Christina and Torrente-Murciano, Laura and Ringe, Emilie (2021) Size Control in the Colloidal Synthesis of Plasmonic Magnesium Nanoparticles. The Journal of Physical Chemistry C. ISSN 1932-7447 DOI https://doi.org/10.1021/acs.jpcc.1c07544

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Official URL: https://doi.org/10.1021/acs.jpcc.1c07544

Abstract

Nanoparticles of plasmonic materials can sustain oscillations of their free electron density, called localized surface plasmon resonances (LSPRs), giving them a broad range of potential applications. Mg is an earth-abundant plasmonic material attracting growing attention owing to its ability to sustain LSPRs across the ultraviolet, visible, and near-infrared wavelength range. Tuning the LSPR frequency of plasmonic nanoparticles requires precise control over their size and shape; for Mg, this control has previously been achieved using top-down fabrication or gas-phase methods, but these are slow and expensive. Here, we systematically probe the effects of reaction parameters on the nucleation and growth of Mg nanoparticles using a facile and inexpensive colloidal synthesis. Small NPs of 80 nm were synthesized using a low reaction time of 1 min and ∼100 nm NPs were synthesized by decreasing the overall reaction concentration, replacing the naphthalene electron carrier with biphenyl or using metal salt additives of FeCl3 or NiCl2 at longer reaction times of 17 h. Intermediate sizes up to 400 nm were further selected via the overall reaction concentration or using other metal salt additives with different reduction potentials. Significantly larger particles of over a micrometer were produced by reducing the reaction temperature and, thus, the nucleation rate. We showed that increasing the solvent coordination reduced Mg NP sizes, while scaling up the reaction reduced the mixing efficiency and produced larger NPs. Surprisingly, varying the relative amounts of Mg precursor and electron carrier had little impact on the final NP sizes. These results pave the way for the large-scale use of Mg as a low-cost and sustainable plasmonic material.

Item Type: Article
Uncontrolled Keywords: AREP2021, IA77
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: The Journal of Physical Chemistry C
Identification Number: https://doi.org/10.1021/acs.jpcc.1c07544
Depositing User: Sarah Humbert
Date Deposited: 05 Jan 2022 16:27
Last Modified: 05 Jan 2022 16:27
URI: http://eprints.esc.cam.ac.uk/id/eprint/6043

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