• Cazade, Pierreandre
• Anthopoulos, Thomas D.
• Boomishankar, Ramamoorthy
• Ogale, Satishchandra
• Naphade, Dipti R.
• Zaręba, Jan K.
• Panday, Rishukumar
• Deswal, Swati
• Guerin, Sarah
• Steiner, Alexander

Abstract

International audience ; <jats:title>Abstract</jats:title><jats:p>Cyclophosphazenes 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 [(PhCH<jats:sub>2</jats:sub>NH)<jats:sub>6</jats:sub>P<jats:sub>3</jats:sub>N<jats:sub>3</jats:sub>Me]I, <jats:bold>[PMe]I</jats:bold>. The compound crystallizes in the polar space group <jats:italic>Pc</jats:italic> and its thin‐film sample exhibits remnant polarization of 5 µC cm<jats:sup>−2</jats:sup>. Vector piezoresponse force microscopy (PFM) measurements indicated the presence of multiaxial polarization. Subsequently, flexible composites of <jats:bold>[PMe]I</jats:bold> 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<jats:sup>−2</jats:sup> are recorded for the poled 20 wt.% <jats:bold>[PMe]I/TPU</jats:bold> 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 <jats:bold>[PMe]I</jats:bold> crystals are facilitated by the high flexibility of the layered supramolecular assembly.</jats:p>

Topics

• density
• compound
• single crystal
• layered
• composite
• density functional theory
• thermoplastic
• space group
• microscopy