Abstract
Microwave-absorbing materials have attracted increased research interest in recent years because of their core roles in the fields of electromagnetic (EM) pollution precaution and information security. In this paper, microwave-absorbing material NiFe-layered double hydroxide (NiFe-LDH) was synthesized by a simple co-precipitation method and calcined for the fabrication of NiFe-mixed metal oxide (NiFe-MMO). The phase structure and micromorphology of the NiFe-LDH and NiFe-MMO were analyzed, and their microwave-absorbing properties were investigated with a vector network analyzer in 2–18 GHz. Both NiFe-LDH and NiFe-MMO possessed abundant interfaces and a low dielectric constant, which were beneficial to electromagnetic wave absorption, owing to the synergistic effect of multi-relaxation and impedance matching. The optimum reflection loss (RL) of NiFe-LDH and NiFe-MMO was −58.8 dB and −64.4 dB, respectively, with the thickness of 4.0 mm in the C band. This work demonstrates that LDH-based materials have a potential application in electromagnetic wave absorption.
Highlights
With the rapid development of electronic products, electromagnetic (EM) wave irradiation has received increasing attention [1,2]
The X-ray diffraction (XRD) patterns reveal that the nanosheets are isostructural with the hydrotalcitelike Layered double hydroxides (LDHs) materials (JCPDS: 40-0215), where the typical diffraction peaks are located at 11.4◦, 22.9◦ and 34.4◦ corresponding to the (003), (006), (012) planes of NiFe-LDH (Figure 1b)
An additional elemental analysis by inductive coupled plasma emission spectrometer shows that the molar ratio of Ni/Fe is 3.79, corresponding to the molar ratio of M2+ /M3+ of 2–4
Summary
Yi Lu 1 , Pingan Yang 2 , Yanhong Li 1 , Dandan Wen 1 , Jiasai Luo 1 , Shuhui Wang 1 , Fang Wu 3 , Liang Fang 3, *. Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing
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