TY - JOUR
T1 - Synthesis and characterization of Fe3O4/polypyrrole/carbon nanotube composites with tunable microwave absorption properties
T2 - Role of carbon nanotube and polypyrrole content
AU - Yang, Ruey Bin
AU - Reddy, P. Madhusudhana
AU - Chang, Chi Jung
AU - Chen, Po An
AU - Chen, Jem Kun
AU - Chang, Chung Chieh
N1 - Funding Information:
The authors appreciate the Precision Instrument Support Center of Feng Chia University in providing the measurement facilities. The authors would like to thank the financial support from the Ministry of Science and Technology – Taiwan, ROC under the contract of NSC 102-2632-E-035-001-MY3 .
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - Two different sizes of Fe3O4 nanoparticles were synthesized by hydrothermal (H-Fe3O4, ≈100nm) and co-precipitation (C-Fe3O4, ≈20nm) methods. Further, Fe3O4/polypyrrole (Ppy) composites were prepared by polymerizing the conductive monomer, pyrrole on the surface of Fe3O4. In addition, we also synthesized Fe3O4/Ppy/carbon nanotube (CNT) composites by blending the CNTs with Fe3O4/Ppy composites. Epoxy resin-based microwave absorbers were prepared at different thicknesses (1, 2 and 3mm) by mixing 20% by weight of the as-prepared composites and the complex permittivity (ε'-jε″) and permeability (μ'-jμ″) were measured in the 2-18GHz frequency range. The composites exhibited significant improvement in microwave absorption (reflection loss≤-10dB) with a bandwidth from 8 to 12.5GHz (X-band) by matching the magnetic properties of Fe3O4 and the dielectric properties of Ppy and CNTs for 20wt% of fillers in 3-mm thickness absorbers. The addition of CNTs into H-Fe3O4/Ppy composites further enhances the minimum reflection loss from -15.8 to -25.9dB. The present results can pave the way to construct microwave absorbers with a desired reflection loss at a target frequency and thus, the efficient complementarities between complex permittivity and permeability of the nanocomposites can be achieved.
AB - Two different sizes of Fe3O4 nanoparticles were synthesized by hydrothermal (H-Fe3O4, ≈100nm) and co-precipitation (C-Fe3O4, ≈20nm) methods. Further, Fe3O4/polypyrrole (Ppy) composites were prepared by polymerizing the conductive monomer, pyrrole on the surface of Fe3O4. In addition, we also synthesized Fe3O4/Ppy/carbon nanotube (CNT) composites by blending the CNTs with Fe3O4/Ppy composites. Epoxy resin-based microwave absorbers were prepared at different thicknesses (1, 2 and 3mm) by mixing 20% by weight of the as-prepared composites and the complex permittivity (ε'-jε″) and permeability (μ'-jμ″) were measured in the 2-18GHz frequency range. The composites exhibited significant improvement in microwave absorption (reflection loss≤-10dB) with a bandwidth from 8 to 12.5GHz (X-band) by matching the magnetic properties of Fe3O4 and the dielectric properties of Ppy and CNTs for 20wt% of fillers in 3-mm thickness absorbers. The addition of CNTs into H-Fe3O4/Ppy composites further enhances the minimum reflection loss from -15.8 to -25.9dB. The present results can pave the way to construct microwave absorbers with a desired reflection loss at a target frequency and thus, the efficient complementarities between complex permittivity and permeability of the nanocomposites can be achieved.
KW - Carbon nanotube
KW - Composite
KW - FeO
KW - Microwave absorption
KW - Polypyrrole
KW - Reflection loss
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U2 - 10.1016/j.cej.2015.10.031
DO - 10.1016/j.cej.2015.10.031
M3 - Article
AN - SCOPUS:84944916766
SN - 1385-8947
VL - 285
SP - 497
EP - 507
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -