Investigation of solution processable albumen–BaTiO3 nanocomposite and its application in high-k films

Albumen and BaTiO3 nanoparticles are employed to make solution processable nanocomposite for high permittivity films. The nanoparticles are modified with poly(acrylic acid) molecules to achieve homogeneous dispersion in albumen aqueous solution and made into films by drop casting. The dielectric constant and loss tangent of albumen–BaTiO3 nanocomposites are investigated as the function of volume fraction of BaTiO3. The nanocomposites exhibit maximum relative permittivity of 52 and good dielectric stability over a wide range of frequency, while the loss tangent is below 0.05 even at high BaTiO3 loading of 80 vol%. The dielectric constants of nanocomposites with lower volume fractions (<41 vol%) are in good agreement with the Lichtenecker-Logarithmic model.