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Herein, Mo single\u2010atoms with a symmetry\u2010broken Mo\u2013N\n                    <jats:sub>3<\/jats:sub>\n                    coordination environment are engineered within carbon nanoflowers to clarify the influence of the local microstructure of Mo species on dielectric behavior and electromagnetic wave absorption performance. For comparison, Mo\u2010containing clusters and Mo\n                    <jats:sub>x<\/jats:sub>\n                    O\n                    <jats:sub>y<\/jats:sub>\n                    nanoparticles are also introduced into the carbon nanoflowers. Theoretical calculations demonstrate that defect\u2010containing Mo\u2013N\n                    <jats:sub>3<\/jats:sub>\n                    sites possess superior dielectric properties relative to conventional Mo\u2013N\n                    <jats:sub>4<\/jats:sub>\n                    configurations, owing to the asymmetric charge distribution induced by carbon defects in the first coordination shell. Experimental results reveal that the Mo\u2013N\n                    <jats:sub>3<\/jats:sub>\n                    configuration within carbon nanoflowers shows superior electromagnetic wave absorption performance with an effective absorption bandwidth of 5.31\u00a0GHz at a thickness of 2.0\u00a0mm. In addition, it is also found that Mo\u2010containing clusters facilitate the reflection loss value, while symmetry\u2010broken Mo\u2013N\n                    <jats:sub>3<\/jats:sub>\n                    sites can expand the effective absorption bandwidth at a thinner thickness. These results demonstrate that tailoring local environments of Mo single\u2010atoms and construction of clusters are promising strategies for optimizing the electromagnetic wave absorption property of an absorber.\n                  <\/jats:p>","DOI":"10.1002\/smll.74883","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T10:14:55Z","timestamp":1785492895000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Defect Engineering of Mo Single\u2010Atoms and Confinement of Mo Clusters in Porous Carbon Nanoflowers for Efficient Electromagnetic Wave Absorption"],"prefix":"10.1002","volume":"22","author":[{"given":"Minjie","family":"Liu","sequence":"first","affiliation":[{"name":"Key Laboratory of In\u2010Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yimeng","family":"Sun","sequence":"additional","affiliation":[{"name":"Key Laboratory of In\u2010Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ziqian","family":"Ma","sequence":"additional","affiliation":[{"name":"Key Laboratory of In\u2010Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of In\u2010Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-9301-5081","authenticated-orcid":false,"given":"Chunling","family":"Zhu","sequence":"additional","affiliation":[{"name":"College of Materials Science and Chemical Engineering Harbin Engineering University  Harbin China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fenghui","family":"Cao","sequence":"additional","affiliation":[{"name":"Daqing Key Laboratory of Photoelectric Functional Materials Daqing Normal University  Daqing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6794-2276","authenticated-orcid":false,"given":"Yujin","family":"Chen","sequence":"additional","affiliation":[{"name":"Key Laboratory of In\u2010Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 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