Preparation of α-nanometer Iron Oxide by Microwave Hydrolysis

Herein,nano α-Fe₂O₃ was synthesized through microwave assisted hydrolysis method with FeCl₃ as raw material,triethylenetetramine（TETA） as ligand.The properties of the nano α-Fe₂O₃ products were analyzed and compared through laser particle size analyzer,FT-IR,and UV-Vis spectra.Microwave assisted hydrolysis method has advantages in yielding smaller and uniform nano particles in shorter time and without aging time.In the latter method,microwave heating time of 14 min and n_TETA∶n_FeCl3=40∶100 are the best conditions,under which smaller and uniform nano α-Fe₂O₃ particles can be achieved.In the FT-IR spectra of nano α-Fe₂O₃,two characteristic absorption peaks at ca.580 and 480 cm^-1 red-shift with the particle size decreasing.Because of quantum size effect,blue shifting in the characteristic absorption peaks at ca.480 nm and ranging 330～350 nm in UV-Vis spectra depend on the decrease of the particle size.