Synthesis of Multi Core-Shell Nanocomposite of MnFe2O4-Multi-Walled Carbon Nanotube Based Polypyrrole and Investigation Radar Absorbing Properties
[1]
S. Hossein Hosseini, Department of Chemistry, Faculty of Science, Islamshahr Branch, Islamic Azad University, Tehran, Iran.
[2]
N. Arjmand, Department of Chemistry, Faculty of Technical and Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran.
[3]
M. Shirazi Madani, Department of Chemistry, Faculty of Technical and Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran.
The synthesis of multi-walled carbon nanotube of polypyrrole (PPy) composites that functionalized by MnFe2O4 nanoparticles (MWCNTS/MnFe2O4/PPy) were reported. The novel procedure relies on a two-step synthesis method. The prime step includes synthesis of mono-dispersed MnFe2O4 nanoparticles (NPS) nested on the surface of carboxylated MWNTS. The second step deals with the newly formed nanocomposite decorated by a PPy layer via in situ polymerization with multi core-shell structure. SEM and TEM images indicated that the obtained samples have the morphologies of nanotubes. Further to this the TEM images and selected area electronic diffractions showed that MnFe2O4 NPs and MWCNT were embedded in PPy. The molecular structure and composition of MWCNTS/MnFe2O4/PPy nanocomposites were characterized by fourier transform infrared spectra (FTIR) and UV-Vis spectra. The results of XRD confirmed the formation of MWCNT/MnFe2O4/PPy nanocomposites and hence confirmed ordered structure of NPs. As a multifunctional material, some physical properties of MWCNT/MnFe2O4/PPy nanocomposites were also investigated. As prepared conducting ferromagnetic polymer nanocomposites have electrical conductivity of the order of 0.5 S/cm and saturation magnetization (Ms) value of 0.06 emu/g. Microwave absorbing properties of the nanocomposite were investigated by using vector network analyzers in the frequency range of 8–16 GHz. The values of the minimum reflection loss were -30 dB in the frequency of 11.6 GHz for MWCNT/MnFe2O4/PPy core/shell nanocomposite with a thickness of 1.5 mm and 60wt% MWCNTs/MnFe2O4 as core. These include; electrical conductivity by means of using four probe method and magnetic property via VSM and AFM techniques.
Multi-Walled Carbon Nanotube, MnFe2O4, Polypyrrole, Nanocomposite, Radar Absorbing Materials
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