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Micro and nanoactuators based on bistable molecular materials

Abstract : Microelectromechanical systems (MEMS) are micrometric devices able to transform a mechanical signal into an electrical one and vice-versa. In the past years they have been successfully employed in different fields of our everyday life for sensing, transducing different forms of energy and for actuating purposes thanks to their low energy dissipation, fast response and high sensibility. Even if recent technological progress has allowed a considerable miniaturization of these devices, several challenges remain. In particular the integration of smart actuating materials at the nanometric scale remains arduous because in most cases they lose their actuating properties at reduced sizes. In this context, this thesis work aimed for exploring the possibility of using molecular spin crossover materials for the development of electromechanical actuators. To this aim we have conceived silicon microcantilevers, which have been coated by various spin crossover molecules using either thermal evaporation or spray-coating methods. The MEMS have been characterized at variable temperature and pressure both in dynamical and static modes using a single experimental setup. The results prove that spin crossover molecules can be successfully integrated into silicon MEMS devices using different fabrication processes and their actuation can be achieved using either a thermal energy source or light irradiation. In parallel, this work has allowed us to extract relevant mechanical properties of spin crossover materials (Young's modulus, Poisson's ratio), which have been largely unknown previously.
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Submitted on : Wednesday, November 7, 2018 - 11:37:03 AM
Last modification on : Tuesday, October 20, 2020 - 4:14:01 PM
Long-term archiving on: : Friday, February 8, 2019 - 1:38:29 PM


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  • HAL Id : tel-01914945, version 1



Maria Dolores Manrique-Juarez. Micro and nanoactuators based on bistable molecular materials. Material chemistry. Université Paul Sabatier - Toulouse III, 2017. English. ⟨NNT : 2017TOU30244⟩. ⟨tel-01914945⟩



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