Electromagnetic composite films based on polypyrrole hydro-sponge and Fe 3O 4 ferrofluid

Abstract

The preparation of free-standing electromagnetic composite films based on conductive polypyrrole (PPy) hydro-sponge and the Fe 3O 4 ferrofluid have been successfully accomplished via self-assembly in the presence of β-cyclodextrin sulfate and under static condition. Transmission electron microscope (TEM), scanning electron microscope (SEM) and X-ray diffraction (XRD) are used to study the morphology of the PPy-Fe 3O 4 composite. Structural characterizations by Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA) have proved the interactions between Fe 3O 4 and PPy chains. As-prepared films possess high electrical conductivity, remarkable magnetic response as well as appropriate flexility. Both the conductivity and magnetization of the composite, the latter in particular, depend strongly on the Fe 3O 4 content and thus can be optimized by adjusting the relative content of Fe 3O 4 in the composite. The combination of both magnetic and conducting activities of the resulting composite makes it be a potential candidate as functional material in electromagnetic devices, such as magnetic-controlled switches.