マイクロ波照射によるFe(NO_3)_3水溶液からの単分散α-Fe_2O_3ナノ粒子の迅速合成

概要

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Monodispersed α-Fe_2O_3 nanoparticles were prepared at 100°,120°, and 140℃ using 0.02, 0.05, and 0.1 M-Fe(NO_3)_3-9H_2O solutions by microwave-hydrothermal (M-H) and conventional-hydrothermal (C-H) reactions. Compared to the formation of monodispersed α-Fe_2O_3 particles using the C-H reaction, the M-H reaction led to increased rate of formation by 3 times at 120℃ and 5 times at 140℃ from 0.1 M-Fe(NO_3)_3 solutions. α-Fe_2O_3 nanoparticles of 23-25 nm in diameter were obtained from 0.02 M solution at 100℃ after treatment for 4 h by applying microwaves, which led to the formation of smaller sized particles with a narrow particle size distribution. The coagulation of nano-sized single crystals of 5 to 6 nm in diameter was enhanced by increasing the concentration of Fe(NO_3)_3 solutions.
2004-07-01