Bifunctional CoNi/MXene@Wood with Vertical Aperture Structure for Electromagnetic Wave Absorption and Infrared Stealth

Multifunctional integrated electromagnetic wave absorption (EMA) materials have been widely concerned. In this work, CoNi/MXene@Wood was prepared by carbonizing natural wood at high temperature and introducing CoNi and Ti3C2Tx MXene into its rectangular honeycomb unit by hydrothermal reaction and vacuum impregnation. Due to the reasonable control of structure and composition, CoNi/MXene@Wood can be employed for both electromagnetic protection and infrared stealth. CoNi/MXene@Wood-1.5 displays excellent EMA performance with a minimum reflective loss (RLmin) of −56.8 dB and the effective absorbing bandwidth (EAB) covering the entire X-band. Besides, with low and stable thermal conductivity (0.219-0.267 W m-1 K-1) over a temperature range of 298-673 K, the CoNi/MXene@Wood can realize the thermal infrared stealth of protected targets in different environments. The structure design and dielectric constant adjustment provide strategies for obtaining high EMA performance materials with infrared stealth.