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However, using nanoscale regulation to the optimization of composite material dielectric properties and enhanced magnetic loss properties is facing significant challenges. Here, the dielectric constant and magnetic loss capability of the carbon skeleton loaded with Cr compound particles are further tuned to enhance the EMW absorption performance. After 700 \u00b0C thermal resuscitation of the Cr3\u2010polyvinyl pyrrolidone composite material, the chromium compound is represented as a needle\u2010shaped structure of nanoparticles, which is fixed on the carbon skeleton derived from the polymer. The size\u2010optimized CrN@PC composites are obtained after the substitution of more electronegative nitrogen elements using an anion\u2010exchange strategy. The minimum reflection loss value of the composite is \u2212105.9\u00a0dB at a CrN particle size of 5\u00a0nm, and the effective absorption bandwidth is 7.68\u00a0GHz (complete Ku\u2010band coverage) at 3.0\u00a0mm. This work overcomes the limitations of impedance matching imbalance and magnetic loss deficiency in carbon\u2010based materials through size tuning, and opens a new way to obtain carbon\u2010based composites with ultra\u2010high attenuation capability.<\/jats:p>","DOI":"10.1002\/smll.202303463","type":"journal-article","created":{"date-parts":[[2023,6,21]],"date-time":"2023-06-21T04:43:20Z","timestamp":1687322600000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":75,"title":["Anion Exchange of Metal Particles on Carbon\u2010Based Skeletons for Promoting Dielectric Equilibrium and High\u2010Efficiency Electromagnetic Wave Absorption"],"prefix":"10.1002","volume":"19","author":[{"given":"Tianqi","family":"Hou","sequence":"first","affiliation":[{"name":"College of Science Sichuan Agricultural University  Ya'an 625014 P. R. 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