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Herein, for the first time, by carbonizing hierarchical poly\u00ad(urea-formaldehyde) microcapsules with Fe3O4 nanoparticle cores in a nitrogen atmosphere, Fe3O4 hybrid and N-doped hollow carbon microspheres (Fe3O4\/CMs) with a hierarchical micro\/nanostructure are prepared on a large scale and at a low cost to achieve extremely superior MA performances. Benefitting from their unique structure and diverse composition, which synergetically contribute to good impedance matching, strong dielectric\/magnetic loss, and abundant multiscattering\/reflection, Fe3O4\/CM composites possessed a RLmin value reaching \u221260.3 dB and an fe of as broad as 6.4 GHz (7.2\u201313.6 GHz, covering the full X-band) at an ultralow filler loading of 10 wt % in paraffin wax, which are significantly superior to those of the previously reported state-of-the-art Fe3O4-based or hollow MAMs. Furthermore, the fe can be adjusted in the range of 4.5\u201318 GHz, covering 85% of the whole measured frequency range, via changing the thickness between 2.5 and 5.5 mm. This work offers new insights for developing advanced lightweight MAMs with strong absorption and a broad absorbing frequency range at a low filler loading.<\/jats:p>","DOI":"10.1021\/acsami.0c04185","type":"journal-article","created":{"date-parts":[[2020,3,27]],"date-time":"2020-03-27T11:06:29Z","timestamp":1585307189000},"page":"18952-18963","source":"Crossref","is-referenced-by-count":104,"title":["Fe3O4 Nanoparticle\/N-Doped Carbon\nHierarchically Hollow Microspheres for Broadband and High-Performance\nMicrowave Absorption at an Ultralow Filler Loading"],"prefix":"10.1021","volume":"12","author":[{"given":"Na","family":"Yang","sequence":"first","affiliation":[{"name":"Sichuan University , , ,","place":["Chengdu, China, 610064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zi-Xuan","family":"Luo","sequence":"additional","affiliation":[{"name":"Sichuan University , , ,","place":["Chengdu, China, 610064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9230-0892","authenticated-orcid":true,"given":"Si-Chong","family":"Chen","sequence":"additional","affiliation":[{"name":"Sichuan University , , ,","place":["Chengdu, China, 610064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8306-2076","authenticated-orcid":true,"given":"Gang","family":"Wu","sequence":"additional","affiliation":[{"name":"Sichuan University , , ,","place":["Chengdu, China, 610064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu-Zhong","family":"Wang","sequence":"additional","affiliation":[{"name":"Sichuan University , , ,","place":["Chengdu, China, 610064"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2020,3,27]]},"reference":[{"key":"2026081713211971300_cit1","doi-asserted-by":"publisher","first-page":"13426","DOI":"10.1039\/C5TA01457C","article-title":"Metal Organic Framework-Derived\nFe\/C Nanocubes Toward Efficient Microwave Absorption","volume":"3","author":"Qiang","year":"2015","journal-title":"J. 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