Peaked dielectric responses in Ti3C2 MXene nanosheets enabled composites with efficient microwave absorption

Abstract

The microwave dielectric behavior of sandwich-like Ti3C2 MXene nanosheets with efficient microwave absorption was investigated by a combination of experiments and simulations. The obvious frequency dispersion effect and the double-peaked feature of dielectric spectra in Ti3C2 MXene nanosheets could be observed over the frequency range of 2–18 GHz, giving rise to superior microwave attenuation capability. Furthermore, a revised Drude-Lorentz model was proposed to explain the peaked feature of permittivity, and simulated results were demonstrated to agree well with the experimental measurements. It was concluded that the hopping migration between Ti3C2 MXene nanosheets with longer relaxation time than “micro-dipole” relaxation within nanosheets makes a superior contribution to overall absorbing performance.

Sandwich-Like Fe&TiO2@C Nanocomposites Derived from MXene/Fe-MOFs Hybrids for Electromagnetic Absorption

“…Both S7 and S8 showed strong EMW attenuation capability in the high frequency range (12)(13)(14)(15)(16)(17)(18), while S6 exhibited a weak performance in the whole tested range (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). It is obviously that S7 possessed the best attenuation capability compared to the other samples, which was beneficial to enhance EM wave energy attenuation.…”

“…Therefore, there is a great demand for developing broadband and high-efficiency electromagnetic wave (EMW) absorbing materials to minimize adverse effects in aspects of health and electrical devices [1][2][3]. Abundant efforts have been contributed to the development of high-efficiency EMW absorbers with a broad effective absorption bandwidth (EAB), especially for the radar frequency range of 2-18 GHz [4][5][6]. In general, materials with laminated structure are well known as promising EMW absorbers.…”

“…Xu et al [26] achieved a Ti 3 C 2 T x with a RL value of − 41.9 dB at 13.4 GHz and thickness of only 1.1 mm by solvothermal treatment. Luo et al [5] demonstrated a wide absorbing bandwidth (EAB over 10 GHz at a thickness of 3 mm) in Ti 3 C 2 T x MXene absorbers. Ti 3 C 2 T x is a representative of MXene family decorated with abundant active surface functional terminations [27][28][29], which could provide remarkable amount of dipolar and interfacial polarizations.…”

Near-infrared light-responsive hydrogels via peroxide-decorated MXene-initiated polymerization

“…27 Owing to their properties of a functionalized surface, small band gaps, and excellent photothermal properties and conductivity, they have diverse applications in batteries, supercapacitors, photocatalysis, electrocatalysis, and biomedicine. [28][29][30][31][32][33] Ti 3 C 2 T x , a representative MXenes, has abundant functional groups (i.e. -OH, -O or -F) and is well dispersible in aqueous solution.…”

Carbon Nanofibers Propped Hierarchical Porous SiOC Ceramics Toward Efficient Microwave Absorption

“…With the rapid development of wireless communication technology, the superfluous electromagnetic wave (EMW) has been regarded as new-type pollution, which is harmful for precise instruments, national security, and even human health [1][2][3]. It is urgent to develop high-performance microwave absorption materials (MAMs) to suppress the undesirable electromagnetic pollution.…”