Facile synthesis of water-soluble and superparamagnetic Fe3O4 dots through a polyol-hydrolysis route
Facile synthesis of water-soluble and superparamagnetic Fe3O4 dots through a polyol-hydrolysis route
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通过多元醇水解途径轻松合成水溶性超顺磁性 Fe3O4 点
DOI：
10.1007/s10853-012-7018-6
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发表时间：
2013-03
影响因子：
4.5
通讯作者：
Zhaoliang Zhang
中科院分区：
文献类型：
--
作者：
Pin Jiang;Xi Yang;Ying Xin;Yongxin Qi;Xicheng Ma;Qian Li;Zhaoliang Zhang
在不添加任何分散剂的情况下，通过多元醇水解法成功地合成了平均粒径约为2.3 nm的单分散Fe 3 O 4量子点。无机硝酸铁用作金属源，三甘醇（TEG）用作多元醇溶剂。采用X射线衍射（XRD）、透射电子显微镜（TEM）、选区电子衍射（SAED）、傅里叶变换红外光谱（FTIR）、N2吸附-脱附、磁化强度等测试手段对样品进行了表征。所合成的Fe 3 O 4量子点不仅可以用乙醇和丙酮从多元醇中凝聚出来，而且可以通过超声处理在水中重新分散，从而产生明显的廷德尔效应。所得到的Fe 3 O 4量子点在室温下表现出超顺磁性，饱和磁化强度远低于以前的工作中所报道的。Fe 3 O 4点的形成机制被认为是铁的硝酸盐的水解和随后的脱水和Fe 3+的部分还原为Fe 2+在TEG中在高温下。
Monodisperse Fe3O4 dots with a mean size of about 2.3 nm were successfully synthesized via a polyol-hydrolysis route without adding any dispersant. Inorganic iron nitrate was used as the metal source and triethylene glycol (TEG) was used as the polyol solvent. The Fe3O4 dots were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selective area electron diffraction (SAED), Fourier transform infrared (FTIR) spectroscopy, N2 adsorption–desorption, and magnetization measurements. The as-synthesized Fe3O4 dots can not only be coagulated from the polyol by ethanol and acetone, but also easily redispersed in water by ultrasonication, resulting in a clear Tyndall effect. The obtained Fe3O4 dots exhibited superparamagnetism at room temperature and the saturation magnetization is much lower than those reported in previous works. The formation mechanism of the Fe3O4 dots was proposed to be the hydrolysis of iron nitrates and subsequent dehydration and partial reduction of Fe3+ to Fe2+ at elevated temperatures in TEG.
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用于磁共振成像的水溶性超顺磁性铁酸锰纳米粒子
影响因子：
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作者：
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DOI：
10.1007/s00339-006-3766-y
发表时间：
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