Controlled Modulation of Intrinsic Electron Response in C/Co_xT_y Nanoplates Toward Multispectral Excitation Devices

Abstract Electromagnetic materials with adjustable dielectric and magnetic properties are constantly sought after in electronic and industrial fields. In this study, an innovative strategy that customizes anchored Co‐based nanoparticles to optimize the electronic behaviors is proposed for the first time, enabling a controllable and high‐efficiency evolution of the macroscopic electromagnetic response of Co‐based (C/Co_xT_y) nanoplates across the X‐ray, light in the solar band and gigahertz band. Specifically, in the gigahertz band, the C/Co and C/Co₃Se₄ nanoplates with high‐power loss capabilities can effectively attenuate and convert electromagnetic energy into heat energy, which not only prevents space electromagnetic radiation but also powers energy for various electromagnetic devices such as thermoelectric generators and microwave actuators. Moreover, multiband antennas and ultra‐wideband bandstop filters are successfully achieved and flexibly tuned. Meanwhile, C/Co_xT_y nanoplates photo‐ and X‐ray detectors are constructed successfully. Additionally, the C/CoTe nanoplate X‐ray detector, featuring remarkable stability, sensitivity and penetrability, is successfully utilized to construct the interaction system integrating communication and imaging. In summary, this work offers an effective way for flexible regulation of multispectral electromagnetic response, significantly advancing the development of multispectral electromagnetic functional devices.