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Journal Articles Materials Advances Year : 2021

Photoactuation of micromechanical devices by photochromic molecules

Liviu Nicu
L. Salmon
Gábor Molnár


Spiropyran doped P(VDF-TrFE) nanocomposite films were spray-coated onto silicon micro-cantilevers. We show that switching the molecules from the closed- to the open-ring form by UV light gives rise to a downward bending of the cantilever as well as to a decrease of its resonance frequency. This photoactuation is reversible by means of heating and simultaneous visible light irradiation. From the flexural bending and resonance data, we extracted the actuation strain (0.13 ± 0.03%), stress (4 ± 1 MPa) and elastic energy density (2.3 ± 1 mJ cm−3) associated with the photoisomerization of spiropyran molecules in the composite films.
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hal-03285954 , version 1 (13-07-2021)


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José Elías Angulo-Cervera, Mario Piedrahita-Bello, Barbora Brachňaková, Alejandro Enríquez-Cabrera, Liviu Nicu, et al.. Photoactuation of micromechanical devices by photochromic molecules. Materials Advances, 2021, 2 (15), pp.5057-5061. ⟨10.1039/d1ma00480h⟩. ⟨hal-03285954⟩
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