Dielectric and physical properties of PMMA:TiO2 thin films by varying TiO2 concentration

This research is to investigate the dielectric properties of PMMA: TiO₂ nanocomposite thin films. The experiments are conducted by varying the TiO₂ concentration from 0wt%, 1wt%, 2wt%, 3wt%. The results indicate that dielectric properties of PMMA: TiO₂ nanocomposite thin film is affected by the amount of TiO₂ concentration added into PMMA solution. The thin film with 3wt% indicate the higher dielectric constant with value 8.04 compare to others concentration. The capacitance result shows that when TiO₂ are added its capacitance value is above pure PMMA where pure PMMA is about 0.004nF. However, for dielectric loss, it shows that the 3wt% thin film with value of 0.06 is lower than other concentrations. The FESEM images show that all the nanocomposite thin films have a porous surface. High porosity is obtained when the amount TiO₂ concentration is increased.