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Micromachining-Compatible, Facile Fabrication of Polymer Nanocomposite Spin Crossover Actuators

Article dans une revue avec comité de lecture
Author
MANRIQUE-JUÁREZ, María D.
461 Laboratoire de chimie de coordination [LCC]
459 Laboratoire d'analyse et d'architecture des systèmes [LAAS]
MATHIEU, Fabrice
459 Laboratoire d'analyse et d'architecture des systèmes [LAAS]
LABORDE, Adrian
459 Laboratoire d'analyse et d'architecture des systèmes [LAAS]
RAT, Sylvain
461 Laboratoire de chimie de coordination [LCC]
SHALABAEVA, Victoria
461 Laboratoire de chimie de coordination [LCC]
DEMONT, Philippe
580 Centre interuniversitaire de recherche et d'ingénierie des matériaux [CIRIMAT]
ccTHOMAS, Olivier
543315 Laboratoire d’Ingénierie des Systèmes Physiques et Numériques [LISPEN]
SALMON, Lionel
461 Laboratoire de chimie de coordination [LCC]
LEICHLE, Thierry
459 Laboratoire d'analyse et d'architecture des systèmes [LAAS]
NICU, Liviu
459 Laboratoire d'analyse et d'architecture des systèmes [LAAS]
MOLNÁR, Gábor
461 Laboratoire de chimie de coordination [LCC]
BOUSSEKSOU, Azzedine
461 Laboratoire de chimie de coordination [LCC]

URI
http://hdl.handle.net/10985/15335
DOI
10.1002/adfm.201801970
Date
2018
Journal
Advanced Functional Materials

Abstract

[FeII(Htrz)2(trz)](BF4) spin crossover particles of 85 nm mean size are dispersed in an SU-8 polymer matrix and spray-coated onto silicon microcantilevers. The subsequent photothermal treatment of the polymer resist leads to micrometer thick, smooth, and homogeneous coatings, which exhibit well-reproducible actuation upon the thermally induced spin transition. The actuation amplitude as a function of temperature is accurately determined by combining integrated piezoresistive detection with external optical interferometry, which allows for the assessment of the associated actuation force (9.4 mN), stress (28 MPa), strain (1.0%), and work density (140 mJ cm−3) through a stratified beam model. The dynamical mechanical characterization of the films evidences an increase of the resonance frequency and a concomitant decrease of the damping in the high-temperature phase, which arises due to a combined effect of the thickness and mechanical property changes. The spray-coating approach is also successfully extended to scale up the actuators for the centimeter range on a polymer substrate providing perspectives for biomimetic soft actuators.

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