H_2SO_4-assisted hydrothermal preparation of γ-AlOOH nanorods

摘要

A facile hydrothermal method was developed to synthesize γ-AlOOH nanorods using AlCl_3 and NH_4OH as the reactants and H_2SO_4 as the morphology-directing agent. Amorphous Al(OH)_3 was formed by mixing AlCl_3 and NH_4OH solutions at room temperature and then the hydrothermal treatment of the amorphous Al(OH)_3 in dilute H_2SO_4 solutions at 240 ℃ for 16.0 h led to the formation of γ-AlOOH nanorods with a preferential growth along [100] direction. The structure, morphology, size of the products were investigated by powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). Our experiments showed that the increase of H_2SO_4/Al(OH)_3 molar ratio from 0 to 0.05 was favorable for the formation of γ-AlOOH nanorods with high aspect ratio (about 80).