Facile transformation of FeO/Fe(3)O(4) core-shell nanocubes to Fe(3)O(4) via magnetic stimulation.
Facile transformation of FeO/Fe(3)O(4) core-shell nanocubes to Fe(3)O(4) via magnetic stimulation.
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DOI：
10.1038/srep33295
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发表时间：
2016-09-26
影响因子：
4.6
通讯作者：
Pellegrino T
中科院分区：
文献类型：
--
作者：
Lak A;Niculaes D;Anyfantis GC;Bertoni G;Barthel MJ;Marras S;Cassani M;Nitti S;Athanassiou A;Giannini C;Pellegrino T
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Here, we propose the use of magnetic hyperthermia as a means to trigger the oxidation of Fe1−xO/Fe3−δO4 core-shell nanocubes to Fe3−δO4 phase. As a first relevant consequence, the specific absorption rate (SAR) of the initial core-shell nanocubes doubles after exposure to 25 cycles of alternating magnetic field stimulation. The improved SAR value was attributed to a gradual transformation of the Fe1−xO core to Fe3−δO4, as evidenced by structural analysis including high resolution electron microscopy and Rietveld analysis of X-ray diffraction patterns. The magnetically oxidized nanocubes, having large and coherent Fe3−δO4 domains, reveal high saturation magnetization and behave superparamagnetically at room temperature. In comparison, the treatment of the same starting core-shell nanocubes by commonly used thermal annealing process renders a transformation to γ-Fe2O3. In contrast to other thermal annealing processes, the method here presented has the advantage of promoting the oxidation at a macroscopic temperature below 37 °C. Using this soft oxidation process, we demonstrate that biotin-functionalized core-shell nanocubes can undergo a mild self-oxidation transformation without losing their functional molecular binding activity.
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影响因子：
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