For any future vast applications of oxide nanostructures in particular photovoltaic cell and field emission applications, well-controlled, uniform dimension as well as vertical-alignment growth is essential. The aims of this work are to demonstrate the ability to synthesize and characterise a range of single crystals oxide nanostructures of controllable aspect ratios as well as to measure their optical and field emission properties. The highlight of this synthesis procedure can be characterized by the success of controlled growth of single-crystal oxide nanostructures using mild conditions. The variations of the solute concentration, temperature, surfactant additives, solvent etc. afford effective and simple way to control the dimensions and orientation of the oxide nanostructures. The oxide nanostructures are characterized using a range of techniques such as X-ray diffraction, electron microscopy, X-ray spectroscopy and other characterisation tools. Structural analyses revealed these nanostructures to be highly crystalline.

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