Abstract
Bilayer polyimide film with superparamagnetic response and conductive surface has been exploited as an important candidate for electromagnetic interference shielding material. Poly-imide matrix was derived from 4,4’-oxydianiline and 3,3’,4,4’-benzophenonetetracarboxylic dianhydride. Iron (III) 2,4-pentanedionate (Fe(acac)3) and (1,1,1-trifluoro-2,4-pentadionato) silver(I) (AgTFA) were chosen as magnetic nanoparticles precursor and silver source, respectively. At magnetic polyimide layer, in situ method allowed the Fe(acac) 3 to decompose to γ-Fe2O3, exhibiting typical superparamagnetic response. The conductive surface-silvered poly-imide layer was prepared via in situ single-stage self-metallization technique by thermal curing of the AgTFA-contained poly(amic acid). The reduction of silver(I) and further aggregation of silver atoms gave the conductive polyimide surface. The surface square resistance for the bilayer film of 0.1 &OHgr;/square could be obtained. The structure and the properties of final bilayer film were characterized by X-ray diffraction, scanning and transmission electron microscope, magnetic and conductive measurements.
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