Synergy in Photomagnetic/Ferromagnetic Sub-50 nm Core-Multishell Nanoparticles

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• 作者：Nada Dia ; Laurent Lisnard ; Yoann Prado ; Alexandre Gloter ; Odile St茅phan ; Fran莽ois Brisset ; Hala Hafez ; Zeinab Saad ; Corine Mathoni猫re ; Laure Catala ; Talal Mallah
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：September 16, 2013
• 年：2013
• 卷：52
• 期：18
• 页码：10264-10274
• 全文大小：532K
• 年卷期：v.52,no.18(September 16, 2013)
• ISSN：1520-510X

文摘

Based on nickel hexacyanidochromate and cobalt hexacyanidoferrate Prussian blue analogues, two series of photomagnetic/ferromagnetic sub-50 nm core multishell coordination nanoparticles have been synthesized in a surfactant-free one-pot multistep procedure with good control over the dispersity (10% standard deviation) and good agreement with the targeted size at each step. The composition and the valence state of each shell have been probed by different techniques that have revealed the predominance of Co^II-NC-Fe^III pairs in a series synthesized without alkali while Co^III-NC-Fe^II photoswitchable pairs have been successfully obtained in the photoactive coordination nanoparticles by control of Cs⁺ insertion. When compared, the photoinduced behavior of the latter compound is in good agreement with that of the model one. Exchange coupling favors a uniform reversal of the magnetization of the heterostructured nanoparticles, with a large magnetization brought by a soft ferromagnetic shell and a large coercivity due to a harder photomagnetic shell. Moreover, a persistent increase of the photoinduced magnetization is observed for the first time up to the ordering temperature (60 K) of the ferromagnetic component because of a unique synergy.