Nanocomposite based on epoxy and MWCNTs modified with NiFe2O4 nanoparticles as efficient microwave absorbing material

作者：Hosseini Hassan; Mahdavi Hossein

来源：Applied Organometallic Chemistry, 2018, 32(4): e4294.

DOI：10.1002/aoc.4294

<jats:p>In order to make a microwave absorbent material with good dielectric and magnetic properties, well dispersed microwave absorbing hybrid epoxy polymer composites containing nickel doped Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> nanocrystals coated on carbon nanotubes (NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>‐MWCNTs/epoxy) were synthesized by the combined precipitation‐hydrothermal method in 1‐30 wt.% of nanoparticles. Nickel possess well interaction with microwave radiation and represents fine electromagnetic interference (EMI) shielding and by dopping it into ferrite spinel structures, does not show any tendency to oxidation. Well‐dispersed NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>–MWCNTs/epoxy nanocomposite prepared by new in‐situ polymerization method. First, NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>–MWCNT nanoparticles ultrasonicated in acetone and after mixing with epoxy resin ultrasonicated again. Finally, hardner added to the composite and tuned temperature for evaporating solvent. X‐ray diffraction (XRD) and energy dispersive spectroscopy (EDS) confirmed the synthesizing NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> nanoparticles. Saturation magnetization value of NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>‐MWCNTs is about 29 emu/g with very low remanence and coercivity content, which revealed that the NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>‐MWCNTs is ferromagnetic nanocrystal. Transmission electron microscopy (TEM) used to characterize the distribution of NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> nanocrystals on the surface of MWCNTs. The TEM images show that NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub> nanocrystals have a mean size of 12 nm, and completely coated on the exterior surface of MWCNTs. The obtained results of reflection loss revealed that the maximum values of reflection loss of the NiFe<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>‐MWCNTs/epoxy increase by enhancing the content of nanoparticles until 10 wt.% and decreases in 30 wt.%.</jats:p>

• 出版日期2018-4