Effect of dopant and DC bias potential on dielectric properties of polyvinyl alcohol (PVA)/PbTiO3 - composite films

Composite films of Polyvinyl alcohol (PVA) mixed with Lead Titante Oxide (PbTiO3) were prepared. Dopant incorporated and DC bias induced electrical parameters were disclosed with respect to pure PVA film. The results demonstrate dielectric polarization is not only directly proportional to PbTiO3% of dopant but also external DC bias potential at 30 °C based on Maxwell Wagner theory. Hence these properties highly applicable as super-capacitor film and humidity sensor applications.

► Significant improvement of dielectric constant observed due to PbTiO3 dopant%. ► The dielectric constant trend in both planes is directly proportional to the PbTiO3% and the external DC bias potential applied across the film. ► The higher magnitude of in plane dielectric constant is due to larger area of composite films. ► For varying PbTiO3% dielectric loss trend is inversely proportional to the DC bias potential and for higher vice versa. ► This property of resolved dielectric polarization may be used as dielectric sensor, capacitor film or humidity sensor.