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Micromachining-compatible, facile fabrication of polymer nanocomposite spin crossover actuators

Manrique-Juárez, María D. and Mathieu, Fabrice and Laborde, Adrian and Rat, Sylvain and Shalabaeva, Victoria and Demont, Philippe and Thomas, Olivier and Salmon, Lionel and Leichle, Thierry and Nicu, Liviu and Molnár, Gábor and Bousseksou, Azzedine Micromachining-compatible, facile fabrication of polymer nanocomposite spin crossover actuators. (2018) Advanced Functional Materials, 28 (29). 1801970. ISSN 1616-301X

(Document in English)

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Official URL: https://doi.org/10.1002/adfm.201801970


[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.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The original PDF of the article can be found at : https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201801970
HAL Id:hal-01816709
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Arts et Métiers ParisTech (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
French RENATECH network - Federal University of Toulouse - CNRS
Deposited On:14 Jun 2018 08:47

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