Flexible MXene‐Based Composite Films for Multi‐Spectra Defense in Radar, Infrared and Visible Light Bands

Abstract

Simultaneously developing protective electronics film for multi-spectra, including the radar, infrared (IR), and visible ranges, for both the military and civilian sectors is extremely challenging. The existing multi-spectracompatible materials mainly concentrate on either the radar/IR or IR/visible bands, trailing the rapid evolution of advanced devices for monitoring electromagnetic signals. Here, it is designed and fabricated an ultra-thin MXene-based composite film (20 µm) containing black phosphorus (BP) and Ni chains (M-B-M(Ni)) with integrated highly efficient thermal IR stealth, visible light absorption, and electromagnetic wave shielding. M-B-M(Ni) exhibits an extremely low IR emissivity of 0.1, decreasing the radiation temperature difference between the surrounding environment and target device. BP offers a high solar absorptance of 80%, which guarantees energy conversion from visible light to heat. Moreover, the absorption proportion of the electromagnetic shielding effectiveness for M-B-M(Ni) is 16% higher than that of pure MXene films (68.7%), owing to the improved magnetic loss by decoration with magnetic Ni chains. Due to the combined merits of MXene, BP, and Ni chains, M-B-M(Ni) opens an avenue for the construction of advanced multi-spectra compatible materials for versatile applications in thermal IR stealth, electromagnetic wave shielding, and energy transformation.

Long‐Term Infrared Stealth by Sandwich‐Like Phase‐Change Composites at Elevated Temperatures via Synergistic Emissivity and Thermal Regulation

“…The high‐resolution XPS spectra of C 1s, O 1s, Ti 2p, and F 1s confirmed the ─OH, ─O, and ─F groups remaining in the MXene film (Figure S2c–f, Supporting Information). [ 24 ] As shown in Figure 1m,n, the MXene film exhibits high infrared reflectivity as well as low transmissivity approaching 0 in the wavelength range of 5–20 µm. Based on the thermal radiation relation (emissivity + reflectivity + transmissivity = 1), the emissivity of the MXene film was calculated to be 0.315 and 0.253 in the specific wavelength ranges of 3–5 and 8–14 µm, respectively (Figure 1o).…”

3D Honeycomb Fe/MXene Derived from Prussian Blue Microcubes with a Tunable Structure for Efficient Low-Frequency and Flexible Electromagnetic Absorbers

“…Currently, the widespread employment of advanced electronic technology has brought ubiquitous electromagnetic (EM) pollution, particularly in the 5G communication era, which poses significant threats to equipment and physical health. − To address these concerns, EM wave absorbers with strong attenuation have become integral in wireless communications, portable electronics, and military fields. − The EM transmission theory manifests that the incident microwaves could be effectively dissipated through dielectric loss as well as magnetic loss, which attenuates EM energy by exchange and/or natural resonance. − Recently, magnetic–dielectric synergistic effects have been perceived as an effective strategy to achieve high-performance EM absorbers. − However, the physical loss mechanism of combined magnetic–dielectric synergism remains unclear due to multiple factors, which have limited the further development of high-efficiency EM absorbers. Hence, it is imperative to exploit novel architectures and further clarify the intrinsic absorbing mechanisms.…”

Melamine foam-induced isotropic graphite foam for effective thermal management and electromagnetic interference shielding

“…This need arises due to the severe challenges posed by electromagnetic interference (EMI) pollution and overheating effects experienced by these tiny integrated devices. [1][2][3][4] More concretely, EMI usually induces crosstalk between electronic devices and device components. At the same time, so many electronic devices and chips working in a compact space, which could be regarded as ''hot spots,'' can also cause significant thermal runaway.…”