Search

To exploit the synergistic effect of architectural and nano-heterointerface engineering on developing high-performance electromagnetic (EM) absorbing materials, herein, a carbon nanotubes@ZnIn 2 S 4 nanosheets/cellulose nanofibers aerogel structure (CNTs@ZIS/CNF) is constructed. On the one hand, the air phase introduced interspersed in CNTs by the 3D porous aerogel structure can effectively avoid mismatched impedance matching and shielding behavior. At the same time, the interlaced ZIS nanosheet decorated on the CNTs maximized the heterointerface coupling effects to enrich the polarization loss mechanism. The optimized CNTs@ZIS/CNF shows an excellent EM absorbing performance with effective bandwidth of 5.8 GHz at a relatively thin thickness of 2.7 mm, more excellent than most present aerogel-shaped EM absorbing material. The multi-angel arch method is also used to verify the practical reflection loss of CNTs@ZIS/CNF, indicating its application potential to cope with the growing EM contaminate issue. Moreover, CNTs@ZIS/CNF exhibits other functions including thermal insulation and secondary recovery benefit from the dissoluble CNF-based porous structure. This work put forward a feasible method for the construction and optimization of high-efficient EM absorbing material. [Display omitted] • A novel CNTs@ZIS/CNF heterostructure aerogel is constructed as EM absorbing material. • The 2D ZIS nanosheets are used to modify the 1D CNTs to construct high-efficient interfacial coupling. • The synthetic effects of architecture design and heterointerface engineering can enrich attenuation mechanisms. • The multi-angle arch method is used to verify the practical EM absorbing performance. [ABSTRACT FROM AUTHOR]

To improve multiple heterointerface coupling efficiencies and efficiently engineer the pore structure of porous carbon, a kind of magnetic cobalt nanoparticles embedded porous carbon framework, derived from economical biomass, was designed in the present study. The resulting magnetic embedded porous carbon framework showed exceptional dielectric responses and a significant polarization effect because of the higher contact surface utilization than the ordinary loaded structure. The effective absorbing bandwidth covers 6.6 GHz with a thickness of 2.3 mm, indicating its capacity to address the increasingly problematic electromagnetic (EM) pollution issue. Meanwhile, the magnetic embedded structure with the carbon framework could protect the embedded particles from common corrosion issues, even after a long time environmental adaptability assessment in the lab and faintly acid condition. This work highlights a potential strategy for the design and synthesis of high-performance carbonaceous EM absorbers. [Display omitted] [ABSTRACT FROM AUTHOR]

The construction of environment-adapted FCS@ZIS heterostructure with Schottky contact for enhancing EM absorbing property. [Display omitted] • A novel heterostructure composed of ZnIn 2 S 4 /carbon is constructed as EM absorber. • The interfacial design with Schottky contact can promote the polarization effect. • The EM absorbing ability is optimized by tunning energy level and heterointerface. • The FCS@ZIS has application potential with excellent environmental adaptability. To alleviate the electromagnetic (EM) contamination, high-performance EM absorbers are urgently required. Constructing heterostructures with diverse energy level structures and high interfacial coupling effects has been considered as an ideal strategy to induce outstanding EM absorbing ability. In this work, the in-situ synthesis of interlaced ZnIn 2 S 4 (ZIS) nanosheets on the 3D foam-like carbon skeleton (FCS) using convenient carbonization and solvothermal approach is used to create a novel heterostructure with Schottky contact, which is then used as EM absorbers. By developing highly utilized heterointerfaces and different energy level structures, the FCS@ZIS heterostructure demonstrates a balanced synergy of multiple-attenuation mechanisms and impedance matching. With appropriate ZIS adjustment, the absorption bandwidth improves from 3.8 GHz to 4.3 GHz, and the lowest reflection coefficient is optimized from −15.6 dB to −52.7 dB, revealing the EM absorbing potential of FCS@ZIS. Furthermore, the unique nano-micro structure of FCS@ZIS can boost the matrix's hydrophobic ability, which is quite significant in practical applications. The importance of the FCS@ZIS Schottky heterostructure in improving the EM absorbing property is revealed in this study, which also proposes a potential technique for developing outstanding EM absorbers. [ABSTRACT FROM AUTHOR]

Nano‐heterointerface engineering has been demonstrated to influence interfacial polarization by expanding the interface surface area and constructing a built‐in electric field (BEF), thus regulating electromagnetic (EM) wave absorption. However, the dielectric‐responsive mechanism of the BEF needs further exploration to enhance the comprehensive understanding of interfacial polarization, particularly in terms of quantifying and optimizing the BEF strength. Herein, a “1D expanded 2D structure” carbon matrix is designed, and semiconductor ZnIn2S4 (ZIS) is introduced to construct a carbon/ZIS heterostructure. The cross‐dimensional nano‐heterointerface design increases interface coupling sites by expanding the interface surface area and induces an increase in the Fermi level difference on both sides of the interface to modulate the distribution of interface charges, thereby strengthening the BEF at the interface. The synergistic effect leads to excellent EM absorption performance (minimum reflection coefficient RCmin = −67.4 dB, effective absorption bandwidth EAB = 6.0 GHz) of carbon/ZIS heterostructure. This work introduces a general modification model for enhancing interfacial polarization and inspires the development of new strategies for EM functional materials with unique electronic behaviors through heterointerface engineering. [ABSTRACT FROM AUTHOR]