Novel hierarchical structure of MoS2/TiO2/Ti3C2Tx composites for dramatically enhanced electromagnetic absorbing properties

Abstract

In order to prevent the microwave leakage and mutual interference, more and more microwave absorbing devices are added into the design of electronic products to ensure its routine operation. In this work, we have successfully prepared MoS2/TiO2/Ti3C2Tx hierarchical composites by one-pot hydrothermal method and focused on the relationship between structures and electromagnetic absorbing properties. Supported by comprehensive characterizations, MoS2 nanosheets were proved to be anchored on the surface and interlayer of Ti3C2Tx through a hydrothermal process. Additionally, TiO2 nanoparticles were obtained in situ. Due to these hierarchical structures, the MoS2/TiO2/Ti3C2Tx composites showed greatly enhanced microwave absorbing performance. The MoS2/TiO2/Ti3C2Tx composites exhibit a maximum reflection loss value of −33.5 dB at 10.24 GHz and the effective absorption bandwidth covers 3.1 GHz (13.9–17 GHz) at the thickness of 1.0 mm, implying the features of wide frequency and light weight. This work in the hierarchical structure of MoS2/TiO2/Ti3C2Tx composites opens a promising door to the exploration of constructing extraordinary electromagnetic wave absorbents.

Two‐Dimensional C/MoS2‐Functionalized Ti3C2Tx Nanosheets for Achieving Strong Electromagnetic Wave Absorption

“…[ 17 ] Generally, it is impedance matching level between materials and free space that controls the reflection; while permittivity and permeability of materials determine the absorption. To evaluate the microwave (MW) absorption performance of the as‐synthesized Ti 3 C 2 T x ‐based absorbers, the reflection loss (RL) values were calculated according to transmission line theory: [ 29 ] $$\[ \begin{array}{*{20}{c}}{{\rm{RL}} = 20{{\log }_{10}}\left| {\left( {{Z_{{\rm{in}}}} - {Z_0}} \right){\rm{/}}\left( {{Z_{{\rm{in}}}} + {Z_0}} \right)} \right|}\end{array} \]$$ $$\[ \begin{array}{*{20}{c}}{{Z_{{\rm{in}}}} = {Z_0}\sqrt {\frac{{{\mu _{\rm{r}}}}}{{{\varepsilon _{\rm{r}}}}}} \tanh \left( {j\frac{{2\pi fd\sqrt {{\mu _{\rm{r}}}{\varepsilon _{\rm{r}}}} }}{c}} \right)}\end{array} \]$$…”

Multifunctional SiC@SiO2 Nanofiber Aerogel with Ultrabroadband Electromagnetic Wave Absorption

“…Reflection loss (RL) is an important factor to evaluate the EMW absorption property of the SiC@SiO 2 NFA, which can be calculated by as follows [55,56]: where Z in is the input impedance of the aerogel, f is the frequency, c is the speed of light, d is the thickness of the aerogel, and Z o is the impedance in free space. We know that a RL value of − 10 dB means 90% absorbed of the incident EMW radiation, and the corresponding bandwidth indicates an effective absorption bandwidth (EAB) [57,58].…”

An Equivalent Substitute Strategy for Constructing 3D Ordered Porous Carbon Foams and Their Electromagnetic Attenuation Mechanism

“…Experiencing the prosperity of metals and their oxides in the early stage, the industrial community proposes new requirements of "thin, light, wide and strong" for EMW absorbing materials, that is, thin coating thickness, lightweight, wide absorption bandwidth and strong absorption capacity [9][10][11]. Deservedly, researchers place great expectations on the development of dielectric loss EMW absorbing materials, especially carbonaceous materials with low density, strong corrosion resistance, high thermal stability, good electrical conductivity and adjustable dielectric properties [12][13][14]. Meanwhile, carbon materials also have the characteristics of diverse microstructure, convenient utilize, simple maintenance, good compatibility with the matrix material etc., which is incomparable to many materials.…”