Metal tuning in metal‐phthalocyanine derived carbon nanocomposites for broadband electromagnetic wave absorption

Abstract Carbon materials possess inherent dielectric properties that enhance electromagnetic wave (EMW) absorption. However, their single‐loss mechanism often restricts the effective bandwidth, while traditional carbon‐based EMW absorbing materials face constraints owing to expensive raw materials and complex synthesis processes, hindering industrialization. To address these challenges, we utilize cost‐effective and readily available metal phthalocyanine as a precursor. The incorporation of magnetic metal components induces magnetic loss mechanisms that effectively compensate for the predominant dielectric characteristics of the carbon matrix. Through a simple grinding and carbonization process, metal nanoparticles are uniformly dispersed within a nitrogen‐doped carbon matrix, thereby creating numerous defects and abundant heterogeneous interfaces. The resulting composites exhibit exceptional EMW absorption, attributed to synergistic multiple‐loss mechanisms. Notably, the CuCoNiZn/NC composite attains an effective absorption bandwidth (EAB) of 5.6 GHz, while the Cu/NC composite achieves a minimum reflection loss (RL min ) of −53.7 dB with an EAB of 5.52 GHz. Additionally, CST simulations validate the practical applicability of the absorber. This study presents a viable pathway for industrializing high‐performance wave‐absorbing materials.