Construction of CuS Nanoflakes Vertically Aligned on Magnetically Decorated Graphene and Their Enhanced Microwave Absorption Properties

Abstract

Hybrid nanocomposites with enhanced microwave absorption properties have been designed by growing CuS nanoflakes on magnetically decorated graphene, and the effect of special nanostructures on microwave absorption properties has been investigated. The structure of the nanocomposites was characterized by Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), N2 adsorption-desorption, and vibrating sample magnetometer (VSM). The influence of cetyltrimethylammonium bromide (CTAB) on the morphology of CuS nanoflakes was also investigated. A possible formation process of the nanocomposites and the mechanism of microwave absorption were explained in detail. As an absorber, the nanocomposites with a filler loading of 20 wt % exhibited enhanced microwave absorption properties due to the special nanostructures, extra void space, and synergistic effect. The maximum reflection loss can reach -54.5 dB at 11.4 GHz, and the absorption bandwidths exceeding -10 dB are 4.5 GHz with a thickness of 2.5 mm, which can be adjusted by the thickness. The results indicate that the hybrid nanocomposites with enhanced microwave absorption properties and lightweight have a promising future in decreasing electromagnetic wave irradiation.

Room-Temperature High-Performance H2S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

“…46,47 When it was exposed to air again, the XPS spectra were found to be almost the same as those before exposure to the H 2 S, indicating the transformation from the CuS to CuO.…”

Magnetic graphene@PANI@porous TiO2 ternary composites for high-performance electromagnetic wave absorption

“…40 Though the EM wave absorption performance of graphene can be dramatically enhanced by adding magnetic materials, the large thickness of the absorbers restricts their further practical applications. [43][44][45] As a classical and important metal oxide, TiO 2 has been widely used in photochemical studies, lithium ion batteries and dielectric materials. 41 It is well known that in addition to impedance matching, the EM wave absorption performance of a material is closely related to the special nanostructures, especially for three-dimensional (3D) nanostructures, and designing and construction of 3D graphene-based composites with extra void space will be interesting for improving EM wave absorption performance due to the complicated geometrical morphologies, multiple reflections and adjustable dielectric and magnetic properties.…”

Strengthened electromagnetic absorption performance derived from synergistic effect of carbon nanotube hybrid with Co@C beads

“…Generally, an ideal EM absorber should satisfy the requirements of light weight, strong absorption, wide absorption frequency range, and thin matching thickness. Depending on the attenuation mechanisms, the EM absorption materials can be mainly classified into two types: one is magnetic loss materials such as Fe [13], Co [14,15], Ni [16,17], and ferrites [1,3], while another is dielectric loss materials including CNTs [18], CuS [19], ZnO [20], and TiO 2 [21]. However, it is not facile to achieve impedance matching relying solely on dielectric loss or magnetic loss according to Z in = Z 0 (μ r /ε r ) 1/2 [22].…”