title: The influence of hydrogen bonding on the dielectric constant and the piezoelectric energy harvesting performance of hydrated metal salt mediated PVDF films.
abstract: Polyvinylidene fluoride (PVDF) films are filled with various mass fractions (wt%) of hydrated metal salt (MgCl2·6H2O) (Mg-salt) to fabricate high performance piezoelectric energy harvesters (PEHs). They deliver up to 4 V of open circuit voltage by simply repeated human finger imparting (under a pressure of ∼4.45 kPa) and also generate sufficient power to turn on at least ten commercial blue light emitting diodes (LEDs) instantly. The enhanced piezo-response is attributed to the combined effect of the change in the inherent dipole moment of the electroactive phase containing PVDF itself and H-bonding arising between the Mg-salt filler and PVDF via electrostatic interactions. Furthermore, it also successfully charged the capacitors, signifying practical applicability as a piezoelectric based energy harvester power source. UV-visible optical absorption spectral analysis revealed the possibility to estimate a change in the optical band gap value at different concentrations of Mg-salt filler added PVDF films that possess a useful methodology where the Mg-salt can be used as an optical probe. In addition dielectric properties have been studied to understand the role of molecular kinetic and interfacial polarization occurs in H-bond PVDF films at different applied frequencies at room temperature.
authors.affiliation: Organic Nano-Piezoelectric Device Laboratory, Department of Physics, Jadavpur University, Kolkata 700032, India. dipankar@phys.jdvu.ac.in.
authors.forename: Santanu
authors.initials: S
authors.lastname: Jana
authors.forename: Samiran
authors.initials: S
authors.lastname: Garain
authors.forename: Shrabanee
authors.initials: S
authors.lastname: Sen
authors.forename: Dipankar
authors.initials: D
authors.lastname: Mandal
mesh_terms: D004553:Electric Conductivity; D011211:Electric Power Supplies; D004867:Equipment Design; D006801:Humans; D006860:Hydrogen Bonding; D015636:Magnesium Chloride / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D012492:Salts / Q000737:chemistry; D055672:Static Electricity; D014867:Water / Q000737:chemistry; D005465:Fluorocarbon Polymers
chemical_list: D015636:Magnesium Chloride; D011145:Polyvinyls; D012492:Salts; D014867:Water; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers