RT journal article
T1 Influence of the Gap Distance and Morphology on the Plasmon Modes of Gold Nanocube Dimers
A1 Barrio, Jesús
A1 Manzorro Ureba, Ramón
A1 Sánchez-Iglesias, Ana
A1 Rodríguez-San-Miguel, David
A1 Coronado-Puchau, Marc
A1 Moreno, Consuelo
A1 Langer, Judith
A1 Fernández-Domínguez, Antonio I.
A1 Trasobares Llorente, Susana
A1 Liz-Marzán, Luis M.
A1 Zamora, Felix
A1 Juárez, Beatriz H.
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Au cubes
K1 dimers
K1 morphologies
K1 nanogaps
K1 plasmons
K1 truncations
AB Plasmonic metallic nanostructures have gained significant attention due to their ability to confine light at the nanoscale. In this study, the influence of minor morphological variations by truncation of different planes on the plasmonic response of colloidal Au nanocube dimers and their separation (nanogap) is investigated by electron energy loss spectroscopy (EELS). To understand the impact of these factors, two different cube models for numerical simulations have been considered: one mimicking the truncation by {111} facets, and another mimicking their truncation by {110} ones. The experimental results, supported by numerical simulations, reveal two origins for the sensitivity of EELS spectra to nanostructure truncation: the plasmonic modes' dependence on facet geometry at the nanogap between Au nanocubes and the beam position's precision, which governs excitation efficiency. Notably, the nanogap distances between Au nanocubes are accurately measured using edge spread functions from High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images, demonstrating that STEM mode provides superior precision compared to the more commonly used TEM modes. These findings contribute to a deeper understanding of the relationship between structural features and plasmonic behavior in Au nanocube dimers, crucial for the designing next-generation plasmonic devices, including quantum plasmonic systems and SERS-based sensors.
PB Wiley
SN 2195-1071
YR 2025
FD 2025-05
LK http://hdl.handle.net/10498/38336
UL http://hdl.handle.net/10498/38336
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026