Hydrothermal Synthesis and Microwave Absorption Properties of Nickel Ferrite/Multiwalled Carbon Nanotubes Composites

Abstract

It is well accepted that the microwave absorption performance of ferrite can be enhanced via the hybridization. However, it is still very challenging to design the hierarchical nanostructure of ferrite hybrids to fabricate wave absorbing composites with both the high efficiency and lightweight. Herein, we successfully realize the in-situ synthesis of nickel ferrite/multiwalled carbon nanotubes (NiFe2O4/MWCNTs) hybrids with a large-scale production by the hydrothermal method. The structural characteristics, morphology, electromagnetic and microwave absorption properties were analyzed by X-ray diffraction, scanning electron microscope and vector network analyzer. The morphological study shows that NiFe2O4 nanoparticles with a small size (tens of nanometers) are coated on the MWCNTs, leading to a three-dimensional hierarchical nanostructure. The NiFe2O4/MWCNTs hybrids show satisfied microwave absorption properties. Typically, the optimized sample shows the minimum reflection loss of −19 dB at 11.3 GHz, and the bandwidth of the reflectivity below −10 dB is 2.5 GHz with a thin thickness of 1.5 mm. This result shall be due to the improved dielectric losses or interface polarization etc. Our results demonstrate a facile approach for the design of ferrite-based microwave absorber to meet the requirements of lightweight, thin-thickness and high efficiency.

Visible light-driven cubic structured NiFe2O4@MWCNTs/TiO2 ternary nanocomposite for photocatalytic degradation of ciprofloxacin

“…The crystal planes (111), (002), (200), (220), (311), (222), (400), (331), (422), (511) and (440) are all aligned with these angles. 59 Crucially, the diffraction peaks seen in the NiFe 2 O 4 /MWCNTs pattern (according to JCPDS Card no. 88-0380) closely resemble those of pure NiFe 2 O 4 of the spinel type, suggesting that the samples have a cubic crystal structure.…”

“…After adding 0.04 g of MWCNTs to the mixture, the mixture was sonicated for an hour. 59 After four hours of vigorous stirring, the slurry was placed into a 50 mL stainless autoclave lined with Teflon. After being sealed and kept at 180 °C for 12 hours, the autoclave was cooled to ambient temperature.…”

“…64 The XRD patterns of NiFe 220), (311), ( 222), (400), (331), ( 422), ( 511) and ( 440) are all aligned with these angles. 59 Crucially, the diffraction peaks seen in the NiFe the crystals is 36 nm. The XRD patterns show similarities between the MWCNTs-related and NiFe 2 O 4 -related diffraction peaks in the NiFe 2 O 4 and MWCNTs composite.…”

Polyimide-based porous carbon and cobalt nanoparticle composites as high-performance electromagnetic wave absorbers

“…[12][13][14][15] Over the past few years, there has been a growing interest in carbon materials such as porous carbon, 16,17 carbon bre (CF), 18,19 and carbon nanotubes (CNT). [20][21][22] These carbon materials exhibit characteristics distinct from metal composites in electromagnetic wave absorption applications, including lighter weight, higher dielectric loss, and chemical stability. However, to obtain exceptional EMW absorption performance, not only require the presence of strong dielectric loss, but electromagnetic impedance matching conditions is also necessary.…”

Fabrication of Electrospun Ni0.5Zn0.5Fe2O4 Nanofibers Using Polyvinyl Pyrrolidone Precursors and Electromagnetic Wave Absorption Performance Improvement

“…Materials such as carbon materials [ 4 , 5 , 6 ], carbonyl iron [ 7 , 8 , 9 ], and various ferrite materials [ 10 , 11 , 12 ] are mainly studied as absorbers because they are light, thin, and small but have a superior EM wave absorption performance. As for a magnetic absorber, soft magnetic spinel ferrite has mainly been studied and shown to modify the EM wave performance by substituting one or more divalent metal ions like Mn [ 13 , 14 , 15 ], Co [ 16 , 17 , 18 ], Ni [ 19 , 20 , 21 ], Cu [ 22 , 23 , 24 ], and Mg [ 25 , 26 ] at the site of Fe atoms.…”