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.
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(a)
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(d)
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(e)
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(f)