The magnetoresistance behavior of the polyurethane composites reinforced with iron nanoparticles which has been heat
treated was reported. The flexible nanocomposites were fabricated by the surface-initiated-polymerization (SIP) method.
The uniformly distributed nanoparticles within the polymer matrix, well characterized by field emission scanning
electron microscopy, favor a continuous carbon matrix formation after annealing, rendering the transition from
insulating to conductive composites. The coercive forces reflect strong particle loading and matrix dependent magnetic
properties. The obtained nanocomposites possess fairly good giant magnetoresistance (MR), with a MR of 7.3 % at room
temperature and 14 % at 130 K. Furthermore, the formed carbon matrix has a 7 wt.% argon adsorption potential for fuel
cell applications.
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