Solution-based synthetic strategies for one-dimensional metal-containing nanostructures.

One-dimensional (1D) nanostructures, such as nanowires, nanotubes, nanorods, and nanoribbons, have attracted significant attention stemming from the plethora of interesting size-dependent and, more importantly, structure-related properties resulting from confinement effects. In particular, the novel properties of 1D nanostructures of metals and metal oxides (binary and ternary) render them as prime candidates for a wide range of applications including the fabrication of nanoscale devices associated with solar cells, energy storage, fuel cells, molecular computing and information storage, medical imaging, diagnosis and detection, drug delivery, sensors and catalysis. Thus, it has been simultaneously necessary and critical to create synthetic protocols for the production of these materials which not only are reliable and reproducible, but also can generate compositionally pure, monodisperse, highly crystalline products of a desired 1D morphology. Solution-based methodologies have demonstrated significant advantages over other approaches, as they are facile, simple, flexible, 'green' by nature, and can be applied to a wide range of nanomaterials with diverse chemical compositions. Moreover, these methods can often be scaled so as to produce large quantities of products which are advantageous from an applications' standpoint. Herein, we present synthetic advances associated with solution-based approaches. Specifically solvothermal/hydrothermal, molten salt, electrospinning, template-directed, solution/one-pot, and sol-gel methodologies are discussed with the primary goal of achieving the reproducible synthesis of 1D motifs of metals, binary metal oxides, and ternary metal oxide systems.