Research Article
Growth of Vertically Aligned ZnO Nanowire Arrays Using Bilayered Metal Catalysts
Figure 7
SEM images of ZnO nanostructures growth with different alloy or pure metal catalysts on sapphire. (a) Cu/Au = 3 nm/3 nm; (b) Cu/Au = 5 nm/1 nm; (c) pure Cu = 5 nm; (d) Ni/Au = 3 nm/3 nm; (e) Ti/Au = 1 nm/5 nm; (f) Cr/Au = 1 nm/5 nm.