Controlling the aspect ratio of one-dimensional of cobalt complex ([(NH3)4Co(OH)2Co(NH3)4]Cl4(H2O)4)

One-dimensional cobalt complex ([(NH3)4Co(OH)2Co(NH3)4]Cl4(H2O)4) was successfully prepared by using a simple CTAB-mediated microemulsion method in a xylene–ethanol–water system. Experiments were designed to investigate the morphologies of samples in different cetyltrimethyl ammonium bromide (CTAB) concentration. The diameter decrease and the aspect ratio of as-product increase with the increasing of the molar ratio of CTAB to Co2+ (RCTAB:Co). The Raman properties was investigated and the possible formation mechanism was supposed.