4 For undoped ZnO, a small amount of oleic acid (0.15 mol equiv
to Zn2+) is added to aid the reaction. A typical synthesis
yields nanowires with diameters of 30 ( 5 nm and lengths
that range from 0.5 to 5 µm (Figure 2). Interestingly, these
nanowires grow from a thin platelet base and are parallel to
each other to form a bundle.