The Effect of CoFe2O4, CuFe2O4 and Cu/CoFe2O4 Nanoparticles on the Optical Properties and Piezoelectric Response of the PVDF Polymer. Mai EL-Masry (  mai.elmasry@thebes.edu.eg ) Higher Engineering Institute https://orcid.org/0000-0002-2681-0883 Rania Ramadan Cairo University Research Article Keywords: Pizoelectric, PVDF, PFM, Cobalt ferrite, Copper ferrite, cobalt doped copper ferrite, nanoparticles. Posted Date: September 1st, 2021 DOI: https://doi.org/10.21203/rs.3.rs-853775/v1 License:   This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License