2021/08/21 by Varun Gupta, Gupta, Varun, Anand Babu +9
Engineering · Materials Science · #Advanced Sensor and Energy Harvesting Materials #Applied Physics (physics.app-ph) #Dielectric materials and actuators #Electrohydrodynamics and Fluid Dynamics #Electrospun Nanofibers in Biomedical Applications #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.2108.09581
openalex publication_date 2021/08/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Delta (\δ) phase comprising polyvinylidene fluoride (PVDF)\nnanoparticles are fabricated through electrospray technique by applying 0.1\nMV/m electric field at ambient temperature and pressure, which is 103\ntimes lower than the typical value, required for \δ-phase transformation.\nThe X-ray diffraction (XRD) and selected area electron diffraction (SAED)\npatterns are clearly indicating the \δ-phase formation. The piezo- and\nferro- electric response of the \δ-PVDF nanoparticles has been\ndemonstrated through scanning probe microscopic technique based on\npiezoresponse force microscopy (PFM). The vertical piezoelectric response,\nindicated by d33 coefficient, is found \∼-11 pm/V. Kink propagation\nmodel is adopted to justify the \δ-phase conversion in electrospray\nsystem. The electrical response from \δ-PVDF nanoparticle comprised\nnanogenerator under the external impacts and acoustic signal indicates that\nmolecular ferroelectric dipoles responsible for piezoelectric responses, are\npoled in-situ during nanoparticle formation, thus further electrical poling is\nnot necessary.\n