ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline (Carbon/PANI) composite system, which is presented as a multi‐dimensional regulation method for the ratio of components, bilayer structure and thickness. The composites exhibit significant ε ′‐negative (EN) and ε ′‐near‐zero (ENZ) responses within the 10–45 MHz range, with an EN magnitude reaching up to 10 5 and ENZ frequency points located between 123 and 189 kHz. There is a significant interfacial polarization behavior between porous biomass carbon and the PANI matrix, which drives the metacomposites to exhibit a positive ε′ of up to 10 5 orders in kHz frequencies. When the two form a synergistic double three‐dimensional network structure, a large number of internal carriers show an EN response in the plasmonic oscillation state. The competition between these two mechanisms can achieve precise regulation of EN dispersion characteristics and ENZ frequency. EM simulations demonstrate a strong EM wave scattering effect of metacomposites at 1 MHz, mainly due to their multiple scattering in the porous carbon network. Our work not only offers an interdisciplinary application scenario for environmentally friendly and low‐cost recycling of biomass fertilizers but also expands the scope of the metacomposites' structure design library and material systems.
Yang et al. (Sun,) studied this question.