Surface And Interface Research Of The Nanoparticles In High Dielectric Composite Materials

With the rapid development of electronics, microelectronics, electricity, informationtechnology and other industries in the modern, electronic materials for applications put forward tomore and more higher requirements. Especially following the request of the market, electronicdevices and components call for the smaller size and multi-function. Moreover, it,s also required atthe same volume to get the lightweight and high energy density of supercapacitors，so this needsto find out the high-performance and large-capacity energy storage capacitor. The traditionalmethod of adding filler particles in the polymer, although increase the dielectric constant ofpolymer to a certain extent, but in these traditional methods still have no satisfactory place, such asthe particles put in polymer are nanometer level, they are very easy to reunite together, resulting inthe dispersion of it in the polymer is bad. At the same time, the compatibility of the filler particlesand polymer is alse bad, these factors have restricted the increase of dielectric constant. Andcorrespond with the increase of the dielectric constant, the dielectric loss also increase a lot.This paper has attempted to modify the conductive and high dielectric particles to solve theseproblems, and then increased the dielectric constant of polymer with poly(vinylidenefluoride)(PVDF) as substrate, while reducing the dielectric loss. After successfully prepared Fe3O4nanoparticles, and then by modifying the nanoparticles with a silane coupling agent KH550andoleic acid. Good experimental results were achieved, especially after the ferroferric oxide modifiedby oleic acid, when the volume fraction of oleic acid modified ferroferric oxide(OAM-Fe3O4) wasabout25%, the dielectric constant reached a maximum of25000(100Hz), the dielectric loss wasabout2,basically reached the expected effect. And not only so, but Ag nanoparticles were coatedon the surface of BatiO3by chemical treatment, and then the composite particles were added topolymer, studied the interface and dielectric properties of the composites.