Enhanced wave absorption of nanocomposites based on the synthesized complex symmetrical CuS nanostructure and poly(vinylidene fluoride)

Abstract

Complex symmetrical CuS nanostructures were synthesized in large scale by a simple wet chemical method at low temperature. As a semiconductor material with superstructure, CuS was well characterized and firstly introduced into PVDF to form nanocomposites. The substantial enhancement of wave absorption (À102 dB at 7.7 GHz) was observed by addition of CuS with a low filler loading (5 wt%). The mechanism for the enhanced wave absorbing properties was explained in detail.

Enhanced Wave‐Absorption Properties of Nanocomposites Based on the Synthesized Bi2S3 Nanorods and Polyvinylidene Fluoride

“…As a larger amount of Bi 2 S 3 is introduced into the system, the maximum absorption decreases at the beginning (À22 dB for 20 wt %) and then it rises slowly (À29 dB for 40 wt %), which is different from most of our former studies. [19,20] The variation can also be observed in the RL curves of Bi 2 S 3 /PVDF nanocomposites with different loadings and the same thickness of 3.5 mm as shown in Figure 5d. From another perspective, samples with higher loadings tend to consume waves in broader frequency ranges.…”

“…[18,19,21] In a Debye relaxation process, the relationship between the real part (e') and imaginary part (e'') could be expressed by Equation (3). [19,25,28] …”

“…[18][19][20][21][22]25] The RL coefficients of pure PVDF and the nanocomposites were calculated by using the measured relative complex permittivity and permeability values. According to the transmission line theory, the RL coefficient (dB) of an electromagnetic wave under the normal incidence at the surface of a single-layer material backed by a perfect conductor at a given frequency and material thickness can be calculated through Equations (1) and (2): [26] Z…”

“…[13] In recent years, lower-dimensional materials such as Fe 3 O 4 , [14,15] ZnO, [16] CdS/Fe 2 O 3 , [17] MnO 2 , [18] and so forth stepped onto the stage of wave-absorbing materials and revealed extraordinary properties. Our research team recently discovered that the complex symmetrical CuS nanostructure has superior wave-absorption property [19,20] as well as the phenomenon that a conductor and semiconductor can generate a synergistic effect and enhance the wave-absorption property. [21,22] In this study, we synthesized a one-dimensional bismuth sulfide nanomaterial on a large scale through a simple hydrothermal method.…”

Synthesis, Electrical and Magnetic Properties of Composites Copper Iodide/Magnetite-Polychlorotrifluoroethylene

“…CuS [18], ZnO [19][20], MnO [21], BaTiO 3 [22] and materials that contain carbon are used as electrically conductive components [23][24][25]. However, the functionalization of the magnetite surface with respective components affects its characteristics and composites in general.…”