MXene-based ultra-thin film for terahertz radiation shielding

Abstract

We have successfully fabricated Ti-based MXenes flakes, Ti3C2Tx, by chemical etching, then prepared it as an organic dispersion and finally spin-coated it on polyimide plastic substrate for terahertz wave shielding. The shielding effectivity of the 12 μm ultra-thin film can reach up to 17 dB measured by the terahertz time-domain spectra. We can attribute the excellent phenomenon to the intrinsic absorption of triple-layered Ti3C2, due to the similar double-peak type refraction curves, which have been respectively observed from the experimental samples and the simulation ones. High conductivity and strong THz absorption indicate the Ti3C2Tx MXene is the absorptive electromagnetic shielding material. Comparing with other kinds of THz shielding materials, the Ti-based MXenes might be a potential candidate for the next generation of ultra-thin and lightweight THz shielding.

MXenes Thin Films: From Fabrication to Their Applications

“…By increasing the speed of the rotator and diluting the solution to a more considerable extent, it is possible to attain single-layered MXene thin films for a variety of applications. For instance, Zou et al fabricated the thin films of Ti 3 C 2 at a lower rotation speed of about 200 rpm, and the thickness of the film was about 25 µm [ 84 ]. Another important aspect of SCM is the fabrication of thin films on different substrates, including glass, ITO, FTO, and polymeric flexible substrates.…”

Ultrathin, flexible, and high-strength polypyrrole/Ti3C2Tx film for wide-band gigahertz and terahertz electromagnetic interference shielding

“…One is to construct a porous and lightweight conductive network inside which the incident electromagnetic waves can be repeatedly reflected till completely absorbed. 15–22 Another is to construct/employ a film with high conductivity ( e.g. , metal foil), which can reflect most of the incident electromagnetic waves, owing to the surface impedance mismatch to free space and absorb most of the remaining part due to the electromagnetic loss mechanism.…”

“…28 Conversely, a spin-coated Ti-based Ti 3 C 2 T x film achieved an ultrasmall thickness of 12 μm, but the EMI SE was only 17.1 dB. 18 Meanwhile, few of these reports were concerned with the mechanical properties of the shielding films. Therefore, great effort is still needed to achieve a balance of flexibility, high EMI SE, high mechanical strength, small thickness, and wide shielding bandwidth (in both the GHz and THz bands) in a potential practical shielding material.…”

“…One is to construct a porous and lightweight conductive network inside which the incident electromagnetic waves can be repeatedly reected till completely absorbed. [15][16][17][18][19][20][21][22] Another is to construct/employ a lm with high conductivity (e.g., metal foil), which can reect most of the incident electromagnetic waves, owing to the surface impedance mismatch to free space and absorb most of the remaining part due to the electromagnetic loss mechanism. [23][24][25] In comparison, the latter strategy can achieve a higher specic SE value (SSE/t, calculated by dividing the EMI SE by the density and thickness) because a high SE can be achieved in ultrathin shielding lms.…”

MXenes: state-of-the-art synthesis, composites and bioapplications

“…11 The synergy of MXenes with other materials confers outstanding qualities such as increased conductivity, 11 improved mechanical capability, 12 and increased thermal stability 13,14 than stand-alone MXenes. These developments have created a great opportunity for MXene hybrid materials for use in energy storage, 15–17 optical electronics, capacitors, 18,19 biosensors, 20,21 phototherapy, 22–24 bioremediation, 25 anti-corrosion, 26 electromagnetic shielding, 27 catalyzation, 28 waste water treatment, 29 pH sensing, 30 fluorescence imaging, 31 photocatalysis, 32,33 thin films, 34 radiation shielding 35 and oxygen reduction. 36…”