Dielectric Properties of PVDF-TrFE/PMMA: TiO_2 Multilayer Dielectric Thin Films

摘要

This paper reports on the dielectric properties of multilayer PVDF-TrFE/PMMA: TiO_2 thin film. Two samples were fabricated on ITO substrates; one with PVDF-TrFE only and another PMMA: TiO_2 on PVDF-TrFE on (PVDF-TrFE/PMMA:TiO_2). Both samples were produced by spin coating method. Dielectric properties were characterized using impedance spectroscopic. Dielectric constant, κ, capacitance and dielectric loss, tan δ values of PMMA:TiO_2/PVDF-TrFE were measured in the frequency range 0 — 50 kHz. The result for dielectric loss did not show any significant different between the samples with and without nanocomposite PVDF-TrFE layer. However, the dielectric constant are affected when depositing a nanocomposite PVDF-TrFE layer on PMMA:TiO_2. The dielectric constant is decreased by 0.3 from 7.9 to 7.6.