| 초록 |
Recently, since the demand for useful applications that can be used in daily life such as wearable device, self-diagnosis kits, and smart health monitoring systems increases, polymer-based magnetoelectric (ME) films have been actively studied. Poly(vinylidene fluoride) (PVDF), which is representative piezoelectric polymers, has been widely used for ME devices because of their configuration of electrically asymmetric β-phase. However, there is a critical problem that poling process was needed to have one-direction alignment of the β-phase which can generate ME responses.In this study, PVDF/Cobalt ferrite (CoFe2O4)/Nickel (Ni) ME films were prepared by sol-gel coating and doctor blading. First, to get self-aligned β-phase and self-biased ME effect, CoFe2O4/Ni films were prepared by sol-gel and calcination of CoFe2O4 layers on the Ni. Then, PVDF films were cast by doctor blading under various conditions such as concentration, drying temperature, and casting height on the CoFe2O4/Ni films. Finally, PVDF/CoFe2O4/Ni ME films were found to obviously exhibit self-bias ME voltages without further poling process. |
