Abstract
We used a spray-coating process to cover silicon microcantilevers with ca. 33 wt% [Fe(Htrz)2(trz)](BF4)@P(VDF70-TrFE30) nanocomposite thin films of 1500 nm thickness. The bilayer cantilevers were then used to investigate the thermomechanical properties of the composites through a combined static and dynamic flexural analysis. The out-of-plane flexural resonance frequencies were used to assess the Young’s modulus of the spray-coated films (3.2 GPa). Then, the quasi-static flexural bending data allowed us to extract the actuation strain (1.3%) and an actuation stress (7.7 MPa) associated with the spin transition in the composite.
Highlights
Laboratoire de Chimie de Coordination, CNRS & University of Toulouse, 205 Route de Narbonne, Laboratoire d’Analyse et d’Architecture des Systèmes, CNRS & University of Toulouse, 7 Avenue du Colonel
The surfactant used in the synthesis enrobes the [Fe(Htrz)2(trz)](BF4) parparticles reduces aggregation
A primary interest of our spray-coating approach is that the resulting films can be incorporated into complex micro- and nanosystems
Summary
Laboratoire de Chimie de Coordination, CNRS & University of Toulouse, 205 Route de Narbonne, Laboratoire d’Analyse et d’Architecture des Systèmes, CNRS & University of Toulouse, 7 Avenue du Colonel. Due to the strong electron-lattice coupling, SCO materials are known to display a considerable volume change across the spin transition [5,6,7], which can be exploited in mechanical actuator devices [8,9,10,11,12,13,14,15,16,17] In this context, an interesting asset of molecular SCO materials is that they can be operated at reduced size scales [18]. Manrique et al reported on the first SCO-MEMS [11], which consisted of a 200 nm film of the SCO complex [Fe(H2 B(pz)2 ) (phen)] (pz = pyrazol-1-yl, phen = 1,10-phenanthroline) deposited by thermal evaporation on a silicon microcantilever The latter was associated with a highly sensitive integrated piezoresistive detection system. Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
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