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Herein, nanogalvanic couple Ag\u2013Fe@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> heterostructures (AFHs) are designed to prevent Ag<jats:sup>+<\/jats:sup> release from the cathodic Ag by sacrificial anodic Fe, which can reduce the cytotoxicity of Ag. AFHs are synthesized with modified galvanic displacement strategy in nonaqueous solution. To eliminate the restriction of lattice mismatch between Fe and Ag, amorphous Fe@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> nanoparticles (NPs) are selected as seeds, meanwhile, reductive Fe can reduce Ag precursor directly even at as low as 20 \u00b0C without additional reductant. The thickness of the Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> shell can influence the amorphous properties of AFHs, and a series of Janus\u2010 and satellite\u2010like AFHs are synthesized. A \u201ccut\u2010off thickness\u201d effect is proposed based on the abnormal phenomenon that with the increase of reaction temperature, the diameter of Ag in AFHs decreases. Because of the interphase interaction and the coupling effect of Ag and Fe@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub>, the AFHs exhibit unique optical and magnetic properties. This strategy for synthesis of monodisperse heterostructures can be extended for other metals, such as Au and Cu.<\/jats:p>","DOI":"10.1002\/advs.201800271","type":"journal-article","created":{"date-parts":[[2018,5,15]],"date-time":"2018-05-15T08:20:18Z","timestamp":1526372418000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":38,"title":["Galvanic Displacement Synthesis of Monodisperse Janus\u2010 and Satellite\u2010Like Plasmonic\u2013Magnetic Ag\u2013Fe@Fe<sub>3<\/sub>O<sub>4<\/sub> Heterostructures with Reduced Cytotoxicity"],"prefix":"10.1002","volume":"5","author":[{"given":"Huilin","family":"Zhang","sequence":"first","affiliation":[{"name":"Beijing Key Laboratory for Magnetoeletric Materials and Devices (BKL\u2010MEMD) Beijing Innovation Center for Engineering Science and Advanced Technology (BIC\u2010ESAT) Department of Materials Science and Engineering College of Engineering Peking University  Beijing 100871 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