TiOx electrode interface modification layer promises the prominent electrical/macroscopic properties of the metallized dielectric films

Abstract

BOPP (Biaxially Oriented Polypropylene)//TiO_x/Al composite films with “laminated” structure were prepared by vacuum evaporation and layer-by-layer coating. The microstructure of composite film was studied by XRD and TEM, and the interface characteristics of composite electrode were also studied by AES, while the pure Al metallized films were used as the comparison. The effect of the intermediate interlayer of BOPP/TiO_x nanocomposite films on the electrical properties of the metallized films was systematically studied by characterizing the self-healing and through-current ability of the modified composite films, e.g., It was found that the wettability between the metal electrode and the dielectric film of the modified dielectric film had been apparently regulated due to the insertion of the metal oxide on its surface, which generated not merely the reduced threshold thickness of the Al electrode, and also increased through-current ability of the metallized film. Moreover, it was observed that the metallized film with TiO_x interfacial layer could prevent the occurrence of transcending self-healing when it occurred, which achieved the isolating self-healing. The nanoindentation result also showed that the bonding strength between the metal electrode and the dielectric film was also improved significantly.