Monodisperse MFe2O4 (M = Fe, Co, Mn) nanoparticles
Monodisperse MFe2O4 (M = Fe, Co, Mn) nanoparticles
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DOI：
10.1021/ja0380852
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发表时间：
2004-01-14
影响因子：
15
通讯作者：
Li, GX
中科院分区：
文献类型：
--
作者：
Sun, SH;Zeng, H;Li, GX
在油酸和油胺存在下，乙酰丙酮铁(3)与1，2-十六二醇发生高温固相反应，得到单分散的磁铁矿(Fe3O4)纳米粒子。同样，Fe(Acac)(3)与Co(Acac)(2)或Mn(Acac)(2)与相同的二元醇反应得到单分散的CoFe2O4或MnFe2O4纳米颗粒。颗粒直径可以通过改变反应条件或通过种子介导的生长来调节，范围从3到20 nm。用高分辨电子显微镜、扫描电子显微镜和X射线衍射仪对合成的氧化铁纳米颗粒进行了表征，结果表明纳米氧化铁具有立方尖晶石结构。此外，X射线衍射、NEXAFS光谱和SQUID磁测量表明，Fe3O4可以被氧化成Fe2O3。通过加入双极性表面活性剂，可以将疏水性纳米粒子转变为亲水性纳米粒子，并易于制备水性纳米粒子分散体。这些氧化铁纳米粒子及其在各种介质中的分散性在磁性纳米器件和生物磁学应用方面具有巨大的潜力。
High-temperature solution phase reaction of iron(III) acetylacetonate, Fe(acac)(3), with 1,2-hexadecanediol in the presence of oleic acid and oleylamine leads to monodisperse magnetite (Fe3O4) nanoparticles. Similarly, reaction of Fe(acac)(3) and Co(acac)(2) or Mn(acac)(2) with the same diol results in monodisperse CoFe2O4 or MnFe2O4 nanoparticles. Particle diameter can be tuned from 3 to 20 nm by varying reaction conditions or by seed-mediated growth. The as-synthesized iron oxide nanoparticles have a cubic spinel structure as characterized by HRTEM, SAED, and XRD. Further, Fe3O4 can be oxidized to Fe2O3, as evidenced by XRD, NEXAFS spectroscopy, and SQUID magnetometry. The hydrophobic nanoparticles can be transformed into hydrophilic ones by adding bipolar surfactants, and aqueous nanoparticle dispersion is readily made. These iron oxide nanoparticles and their dispersions in various media have great potential in magnetic nanodevice and biomagnetic applications.