HU, Yaowei; PICHER, Matthieu; TRAN, Ngoc Minh; PALLUEL, Marlène; STOLERIU, Laurentiu; DARO, Nathalie; MORNET, Stephane; ENACHESCU, Cristian; FREYSZ, Eric; BANHART, Florian; CHASTANET, Guillaume

doi:10.1002/adma.202105586

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HU, Yaowei
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]

PICHER, Matthieu
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]

TRAN, Ngoc Minh
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Article de revue

Ce document a été publié dans

Advanced Materials. 2021-10-03, vol. 33, n° 52, p. 2105586 (10 p.)

Wiley-VCH Verlag

Résumé en anglais

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.< Réduire

Mots clés en anglais

ultrafast electron microscopy

single nanoparticle detection

spin crossover

timeresolved spectroscopy

nanohybrids

DOI

http://dx.doi.org/10.1002/adma.202105586

Project ANR

Nanomatériaux hybrides pour une commutation photo-thermique contrôlée - ANR-17-CE09-0010
Microscopie électronique ultrarapide en transmission - ANR-11-EQPX-0041

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026