文摘
Single-crystalline alkaline-earth metal manganites CaMn3O6, SrMn3O6鈥?i>x and Ba6Mn24O48 nanoribbons have been successfully synthesized by a facile ion-exchange approach based on molten-salt reaction between Na0.44MnO2 nanoribbons and CaCl2, SrCl2, and BaCl2. All of these as-prepared nanoribbons are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Taking the synthesis of single-crystalline SrMn3O6鈥?i>x nanoribbons as an example, we researched in detail the conversion process from Na0.44MnO2 nanoribbons to SrMn3O6鈥?i>x nanoribbons. Our results indicate that Na0.44MnO2 nanoribbons serve as the precursor template and the final products are obtained via ion-exchange reaction. Although there is a complete cation exchange, a change in stoichiometry, and a change in crystal structure, the morphology is nearly perfectly maintained. The synthetic method is thought to be a self-sacrificing templating route.