Alignment of polymer based magnetic composites in magnetic field
- 1. a-Institute for Nuclear Problems, Belarusian State University, Minsk, Belarus; b-Tomsk State University, Tomsk, Russia; c-Research Institute for Physical and Chemical Problems, Belarusian State University, Minsk, Belarus; d-Institute of Chemistry of New Materials, National Academy of Sciences of Belarus, Minsk, Belarus; e-Belarusian State University of Technology, Minsk, Belarus; f-Faculty of Sciences No5, Lebanese University, Elnabatieh, Lebanon; g-National Institute of Nuclear Physics, Frascati National Laboratory, Frascati, Italy.
Description
Composite films made of graphene nanoplatelets (GNP) and magnetite Fe3O4 nanoparticles have been prepared with and without magnetic field. Poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid (PEDOT:PSS) was used as a stabilizing polymer matrix. Film morphology was found to depend strongly on the presence of magnetic field, i.e. more porous structure of GNP- Fe3O4 is formed in magnetic field. Thin films formed without magnetic field have activation character of conductivity, while thin films formed in magnetic field have metallic conductivity. Thus, the magnetic field acting during film formation in these composites results in semiconductor-metal transition. DFT calculations show that at low distance between GNP surface and nanoparticle strong interaction between them can be observed.
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