Controllable Synthesis of Highly Symmetrical Streamlined Structure for Wideband Microwave Absorption

Highly symmetrical and streamlined nanostructures possessing unique electron scattering, electron-phonon coupling, and electron confinement characteristics have attracted a lot of attention. However, the controllable synthesis of such a nanostructure with regulated shapes and sizes remains a huge challenge. In this work, a peanut-like MnO@C structure, assembled by two core-shell nanosphere is developed via a facile hydrogen ion concentration regulation strategy. Off-axis electron holography technique, charge reconstruction, and COMSOL Multiphysics simulation jointly reveal the unique electronic distribution and confirm its higher dielectric sensitive ability, which can be used as microwave absorption to deal with currently electromagnetic pollution. The results reveal that the peanut-like core-shell MnO@C exhibits great wideband properties with effective absorption bandwidth of 6.6 GHz, covering 10.8-17.2 GHz band. Inspired by this structure-induced sensitively dielectric behavior, promoting the development of symmetrical and streamlined nanostructure would be attractive for many other promising applications in the future, such as piezoelectric material and supercapacitor and electromagnetic shielding. Highly symmetrical streamlined peanut-like MnO@C composite is successfully constructed. Off-axis electron holography technique and COMSOL simulation are utilized confirmed peanut-like MnO@C middle narrow junction interface inducing surface plenty electric dipole to enhance microwave absorption bandwidth.image

Automated summary

In this study, a peanut-like MnO@C composite with highly symmetrical and streamlined structure was successfully synthesized through hydrogen ion concentration regulation. It possesses unique characteristics of electron scattering, electron-phonon coupling, and electron confinement. The results show that the peanut-like core-shell MnO@C exhibits great wideband properties and higher dielectric sensitive ability, making it suitable for applications in microwave absorption to deal with electromagnetic pollution.