Photo‐Thermal Switching of Individual Plasmonically Activated Spin Crossover Nanoparticle Imaged by Ultrafast Transmission Electron Microscopy
STOLERIU, Laurentiu
Alexandru Ioan Cuza University of Iași = Universitatea Alexandru Ioan Cuza din Iași [UAIC]
Alexandru Ioan Cuza University of Iași = Universitatea Alexandru Ioan Cuza din Iași [UAIC]
ENACHESCU, Cristian
Alexandru Ioan Cuza University of Iași = Universitatea Alexandru Ioan Cuza din Iași [UAIC]
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Alexandru Ioan Cuza University of Iași = Universitatea Alexandru Ioan Cuza din Iași [UAIC]
Language
en
Article de revue
This item was published in
Advanced Materials. 2021-10-03, vol. 33, n° 52, p. 2105586 (10 p.)
Wiley-VCH Verlag
English Abstract
Spin Crossover (SCO) is a promising switching phenomenon when implemented in electronic devices as molecules, thin films or nanoparticles. Among the properties modulated along this phenomenon, optically induced mechanical ...Read more >
Spin Crossover (SCO) is a promising switching phenomenon when implemented in electronic devices as molecules, thin films or nanoparticles. Among the properties modulated along this phenomenon, optically induced mechanical changes are of tremendous importance as they can work as fast light-induced mechanical switches or allow to investigate and control microstructural strains and fatigability. The development of characterization techniques probing 2 nanoscopic behaviour with high spatio-temporal resolution allows to trigger and visualize such mechanical changes of individual nanoscopic objects. Here we use Ultrafast Transmission Electron Microscopy (UTEM) to precisely probe the length changes of individual switchable nanoparticles induced thermally by nanosecond laser pulses. This allows us to reveal the mechanisms of spin switching, leading to the macroscopic expansion of SCO materials. This study was conducted on individual pure SCO nanoparticles and SCO nanoparticles encapsulating gold nanorods that serve for plasmonic heating under laser pulses. Length changes are compared with time-resolved optical measurements performed on an assembly of these particles.Read less <
English Keywords
ultrafast electron microscopy
single nanoparticle detection
spin crossover
timeresolved spectroscopy
nanohybrids
ANR Project
Nanomatériaux hybrides pour une commutation photo-thermique contrôlée - ANR-17-CE09-0010
Microscopie électronique ultrarapide en transmission - ANR-11-EQPX-0041
Microscopie électronique ultrarapide en transmission - ANR-11-EQPX-0041
Origin
Hal imported