Thermal Decomposition Synthesis of Iron Oxide Nanoparticles with Diminished Magnetic Dead Layer by Controlled Addition of Oxygen.
Thermal Decomposition Synthesis of Iron Oxide Nanoparticles with Diminished Magnetic Dead Layer by Controlled Addition of Oxygen.
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DOI：
10.1021/acsnano.7b00609
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发表时间：
2017-02-28
期刊：
影响因子：
17.1
通讯作者：
Rinaldi C
中科院分区：
文献类型：
--
作者：
Unni M;Uhl AM;Savliwala S;Savitzky BH;Dhavalikar R;Garraud N;Arnold DP;Kourkoutis LF;Andrew JS;Rinaldi C
几十年来，专注于氧化铁纳米颗粒的尺寸和形状控制的研究已经导致了对物理尺寸和形状提供优异控制的合成方法，但对磁性的控制相对较差。基于有机金属前体在不存在氧气的情况下的热分解的流行合成方法已经产生具有混合氧化铁相、晶体缺陷和比预期的磁性能差的颗粒，包括通过磁直径显著小于物理直径实验证明的厚的“磁死层”的存在。在这里，我们展示了如何通过引入分子氧作为热分解合成中的反应物种之一，可以获得具有很少缺陷和相似的物理和magetic直径分布的单晶氧化铁纳米颗粒。这是在不需要任何合成后氧化或热退火的情况下实现的。这些结果解决了合成具有可预测磁性的纳米颗粒的重大挑战，并为磁性纳米颗粒的应用进展铺平了道路。
Decades of research focused on size and shape control of iron oxide nanoparticles have led to methods of synthesis that afford excellent control over physical size and shape, but comparatively poor control over magnetic properties. Popular synthesis methods based on thermal decomposition of organometallic precursors in the absence of oxygen have yielded particles with mixed iron oxide phases, crystal defects and poorer than expected magnetic properties, including the existence of a thick “magnetically dead layer” experimentally evidenced by a magnetic diameter significantly smaller than the physical diameter. Here, we show how single crystalline iron oxide nanoparticles with few defects and similar physical and magetic diameter distributions can be obtained by introducing molecular oxygen as one of the reactive species in the thermal decomposition synthesis. This is achieved without the need for any post-synthesis oxidation or thermal annealing. These results address a significant challenge in the synthesis of nanoparticles with predictable magnetic properties and pave way to advances in applications of magnetic nanoparticles.
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