Complex oxides with structures such

Complex oxides with structures such as perovskite, spinel,and garnet have many important properties and applications in science and engineering, such as ferroelectricity, ferromagnetism, colossal magnetoresistance, semiconductors,luminance, and optoelectronics.1-6 Nanostructures (nano particles, nanowires, and nanobelts) of complex oxides have attracted much attention because of their size-induced novel properties. Although some synthesis methods are successful for fabricating single-cation oxide nanocrystals,7-14 only a limited amount of work is available for synthesizing nanostructures of complex oxides (with two or more types of cations) because of difficulties in controlling the composition, stoichiometry, and/or crystal structure. The existing techniques rely on high pressure, salt-solvent-mediated high temperature, surface-capping agent, or organometallic precursormediated growth process,15-24 and the types of oxides that can be synthesized are rather limited. Therefore, seeking a simple approach for low-cost, lower temperature, large-scale,controlled growth of oxide nanostructures at atmospheric pressure is highly desired, and it is important for exploring zero- and one-dimensional complex oxide-based nanostructures for applications in nanodevices and nanosystems.