Article Dans Une Revue Small Année : 2023

Design and Piezoelectric Energy Harvesting Properties of a Ferroelectric Cyclophosphazene Salt

Résumé

AbstractCyclophosphazenes offer a robust and easily modifiable platform for a diverse range of functional systems that have found applications in a wide variety of areas. Herein, for the first time, it reports an organophosphazene‐based supramolecular ferroelectric [(PhCH2NH)6P3N3Me]I, [PMe]I. The compound crystallizes in the polar space group Pc and its thin‐film sample exhibits remnant polarization of 5 µC cm−2. Vector piezoresponse force microscopy (PFM) measurements indicated the presence of multiaxial polarization. Subsequently, flexible composites of [PMe]I are fabricated for piezoelectric energy harvesting applications using thermoplastic polyurethane (TPU) as the matrix. The highest open‐circuit voltages of 13.7 V and the maximum power density of 34.60 µW cm−2 are recorded for the poled 20 wt.% [PMe]I/TPU device. To understand the molecular origins of the high performance of [PMe]I‐based mechanical energy harvesting devices, piezoelectric charge tensor values are obtained from DFT calculations of the single crystal structure. These indicate that the mechanical stress‐induced distortions in the [PMe]I crystals are facilitated by the high flexibility of the layered supramolecular assembly.

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hal-04407658 , version 1 (20-01-2024)

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Swati Deswal, Rishukumar Panday, Dipti Naphade, Pierre‐andre Cazade, Sarah Guerin, et al.. Design and Piezoelectric Energy Harvesting Properties of a Ferroelectric Cyclophosphazene Salt. Small, 2023, 19 (46), ⟨10.1002/smll.202300792⟩. ⟨hal-04407658⟩
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