ZnO has received much attention over the past few years because it has a wide range of properties that depend on doping, including a range of conductivity from metallic to insulating (including n-type and p-type conductivity), high transparency, piezoelectricity, wide-bandgap semiconductivity, room-temperature ferromagnetism, and huge magneto-optic and chemical-sensing effects. Without much effort, it can be grown in many different nanoscale forms, thus allowing various novel devices to be achieved. ZnO has probably the richest variety of different nanostructures. Its range includes highly ordered nanowire arrays, tower-like structures, nanorods, nanobelts, nanosprings, nanocombs, and nanorings. We address the synthesis routes for a number of these structures. The literature on ZnO nanostructures is immense and we can only describe a small selection of work. We start with structures that can be obtained using chemical vapor deposition (CVD) and metal-organic CVD, including growth with ...more