RT Journal Article
T1 Unveiling spin transition at single-particle level in levitating spin crossover nanoparticles
A1 Pinilla Cienfuegos, Elena
A1 Mascaró Burguera, Lucas
A1 Torres Cavanillas, Ramón
A1 Echavarría, J. Ignacio
A1 Regueiro, Alejandro
A1 Coronado, Eugenio
A1 Hernández Rueda, Francisco Javier
AB The ability to control and understand phase transitions of individual nanoscale building blocks is key to advancing the next generation of low-power reconfigurable nanophotonic devices. To address this critical challenge, molecular nanoparticles (NPs) exhibiting spin crossover (SCO) phenomenon are trapped by coupling a quadrupole Paul trap to a multispectral polarization-resolved scattering microscope. This contact-free platform simultaneously confines, optically excites, and monitors the spin transition in Fe(II)–triazole NPs in a pressure-tunable environment, eliminating substrate artifacts. Thus, we demonstrate light-driven manipulation of the spin transition in levitating NPs, enabled by laser heating and free of substrate-induced effects. Using the robust spin bistability near room temperature of our SCO system, we quantify reversible optovolumetric changes of up to 10%, revealing precise switching thresholds at the single-particle level. Independent pressure modulation produces a comparable volume increase, confirming mechanical control over the same bistable transition. These results constitute full real-time control and readout of spin states in levitating SCO NPs, with operating conditions compatible with ultralow-power optical switching, data storage, and nanoscale sensing.
PB American Chemical Society
SN 1936-0851
YR 2026
FD 2026-02-03
LK https://hdl.handle.net/20.500.14352/133996
UL https://hdl.handle.net/20.500.14352/133996
LA eng
NO E. Pinilla-Cienfuegos, L. Mascaró-Burguera, R. Torres-Cavanillas, J.I. Echavarría, A. Regueiro, E. Coronado, and J. Hernandez-Rueda, “Unveiling Spin Transition at Single-Particle Level in Levitating Spin Crossover Nanoparticles,” ACS Nano 20(6), 5044–5053 (2026).
NO Copyright © 2026 The Authors.SEJIGENT/2021/039.PRTR-C17.I1.MFA/2022/050.MFA/2022/025.PROMETEO Program CIPROM/2024/51.TSI-069100-2023-0012.
NO Generatitat Valenciana
NO Ministerio de Ciencia e Innovación (España)
NO Agencia Estatal de Investigación
NO European Commission
NO Comunidad de Madrid
DS Docta Complutense
RD 2 abr 2026