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Herein, taking a representative carbon\u2010based microwave absorber as a model system, we develop a confined diffusion\u2010mediated interfacial engineering strategy to construct SiC@C Janus hollow nanostructures with well\u2010defined asymmetric nano\u2010interfaces, enabling the coordinated regulation of interfacial configuration and electromagnetic functionality. At an ultralow filler loading of 10\u00a0wt.%, the optimized composite achieves a minimum reflection loss of \u201062.36\u00a0dB, an effective absorption bandwidth of 7.82\u00a0GHz, together with a pronounced radar cross section reduction. Combined theoretical analysis, electromagnetic simulations, and multiscale characterizations reveal that the asymmetric Janus nano\u2010interfaces promote improved impedance matching via refined dielectric modulation. Meanwhile, the coupling of the hollow architecture with heterogeneous interfaces induces multiple reflections, scattering, and interfacial polarization, thereby synergistically enhancing electromagnetic energy dissipation. This work provides nanoscale insights into the electromagnetic modulation mechanism governed by asymmetric Janus interfaces and establishes a general paradigm of confined interfacial engineering, offering new theoretical guidance and structural design strategies for next\u2010generation high\u2010performance electromagnetic protection materials.<\/jats:p>","DOI":"10.1002\/advs.77021","type":"journal-article","created":{"date-parts":[[2026,8,6]],"date-time":"2026-08-06T09:17:48Z","timestamp":1786007868000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Janus Nanostructures Enabled by Confined Interfacial Engineering for Enhanced Electromagnetic Response"],"prefix":"10.1002","author":[{"given":"Limeng","family":"Song","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering Zhengzhou University of Aeronautics  Zhengzhou P. R. 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