Facile Microwave Process in Water for the Fabrication of Magnetic Nanorods

作者：Milosevic Irena; Jouni Hicham; David Catalina; Warmont Fabienne; Bonnin Dominique; Motte Laurence^*

来源：Journal of Physical Chemistry C, 2011, 115(39): 18999-19004.

DOI：10.1021/jp205334v

Magnetic nanorods were successfully prepared in water by a simple and fast method through microwave (MW) assisted reduction using akaganeite beta-FeOOH nanorods and hydrazine as precursors and reductor, respectively. Elongated paramagnetic akaganeite precursors are synthesized for the first time using dopamine as green chemical shape-control agent. The nature and the growth mechanism are identified by XRD, Raman spectroscopy and HRTEM analysis. Fast MW reduction process induces a structural and magnetic change depending on MW irradiation cycles. After 2 min, MW reduction leads to iron oxide nanorods with aspect ratio 3.2. XRD and Raman spectroscopy indicate a heterogeneous composition with high proportion of maghemite. The FMR spectrum is characteristic of shape anisotropy and weak ferromagnetic behavior is observed from SQUID measurements.

• 出版日期2011-10-6