Computational investigation of the plasmonic properties of TiN, ZrN, and HfN nanoparticles: The role of particle size, medium, and surface oxidation

TL;DR

This study uses finite element modeling to analyze how particle size, surface oxidation, and medium affect the plasmonic properties of TiN, ZrN, and HfN nanoparticles, revealing size-dependent shifts and broadening of plasmon resonances.

Contribution

It provides a detailed computational analysis of how surface oxidation and particle size influence the plasmonic response of TMN nanoparticles, informing their application in photothermal and solar energy technologies.

Findings

LSPR frequency redshifts with increasing particle size and oxidation

Surface oxidation causes size-dependent shifts and broadening of plasmonic peaks

NP performance varies with size, surface, and excitation wavelength in photothermal applications

Abstract

Group 4 transition metal nitride (TMN) nanoparticles (NPs) display strong plasmonic responses in the visible and near-infrared regimes, exhibit high melting points and significant chemical stability and thus are potential earth-abundant alternatives to Au and Ag based plasmonic applications. However, a detailed understanding of the relationship between TMN NP properties and plasmonic response is required to maximize their utility. In this study, the localized surface plasmon resonance (LSPR) frequency, bandwidth, and extinction of titanium nitride (TiN), zirconium nitride (ZrN), and hafnium nitride (HfN) NPs were examined as a function of the particle size, surface oxidation, and refractive index of the surrounding medium using finite element method (FEM). A linear redshift in the LSPR frequency and a linear increase in the associated full-width at half maximum (FWHM) was observed with increasing the particle size, oxidation layer thickness, and medium refractive index. We show that the effect of surface oxidation on plasmonic properties of TMN NPs is strongly size-dependent with a significant LSPR redshift, intensity reduction, and broadening in small NPs compared to larger NPs. Furthermore, the performance and efficiency of HfN, ZrN, TiN as well as Au NPs for a narrowband application - photothermal therapy (PTT), and a broadband application - solar energy conversion, was investigated in detail. The results indicate that narrowband and broadband photothermal performance of NPs strongly depend on the particle size, surface properties and in case of narrowband absorption, excitation wavelength.