Synthesis, magnetic characterization and sensing applications of novel dextran-coated iron oxide nanorods.

Synthesis, magnetic characterization and sensing applications of novel dextran-coated iron oxide nanorods.
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DOI:
10.1021/cm8031863
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发表时间:
2009-04-28
影响因子:
8.6
通讯作者:
Perez, J. Manuel
Perez, J. Manuel
中科院分区:
材料科学2区
文献类型:
--
作者:
Nath, Sudip;Kaittanis, Charalambos;Ramachandran, Vasanth;Dalal, Naresh S.;Perez, J. Manuel

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使用简便且可扩展的方法合成了单分散、水溶性葡聚糖包覆的氧化铁 (Fe3O4) 纳米棒。我们的室温方法涉及将铁盐的酸性溶液与氢氧化铵的碱性溶液混合,以促进氧化铁晶体的初始形成。这些纳米棒的稳定性、结晶度和形状取决于葡聚糖的添加时间以及聚合物的纯度。合成的纳米棒表现出独特的磁特性,包括超顺磁行为和高自旋水弛豫率 (R2)。此外,与文献中报道的球形氧化铁纳米粒子相比,它们具有增强的过氧化物酶活性。因此,这种聚合物涂层氧化铁纳米棒的高产率合成方法将加速其在磁性传感器、设备和具有磁性和催化性能的纳米复合材料中的应用。
Monodisperse, water-soluble dextran-coated iron oxide (Fe3O4) nanorods were synthesized using a facile and scalable approach. Our room temperature method involves the mixing of an acidic solution of iron salts with a basic solution of ammonium hydroxide to facilitate initial formation of iron oxide crystals. The stability, crystalinity and shape of these nanorods depends on the time of addition of the dextran, as well as the degree of purity of the polymer. The as-synthesized nanorods exhibit unique magnetic properties, including superparamagnetic behavior and high spin-spin water relaxivity (R2). Additionally, they possess enhanced peroxidase activity when compared to those reported in the literature for spherical iron oxide nanoparticles. Thus, this high yield synthetic method for polymer-coated iron oxide nanorods will expedite their use in applications from magnetic sensors, devices and nanocomposites with magnetic and catalytic properties.
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