Growth of Vertically Aligned ZnO Nanowire Arrays Using Bilayered Metal Catalysts

Table 1

Experimental growth conditions and results of ZnO NW samples.

Samples	Thickness of metal (nm)	Morphology	NW length	NW diameter (nm)
A	Cu : Au = 1 nm : 5 nm	Vertically aligned NW	>5 μm	20–200
B	Cu : Au = 3 nm : 3 nm	Vertical NW	>2 μm	20–200
C	Cu : Au = 5 nm : 1 nm	Mixture growth of vertical NW and nano-wall	<2 μm	50–400
D	Ni : Au = 1 nm : 5 nm	Vertically aligned NW	>5 μm	20–200
E	Ni : Au = 3 nm : 3 nm	Vertically NW and nano-wall	500 nm–2 μm	50–300
F	Cu = 5 nm	Mostly vertical NW	>2 μm	50–300
G	Ni = 5 nm	Few sparse and short NW	<200 nm	30–60
H	Ti : Au = 1 nm :  5 nm	Few vertical NW	<3 μm	60–150
I	Cr : Au = 1 nm : 5 nm	Sparse and vertical NW	400 nm–2 μm	60–200
J	Au = 5 nm	Vertically aligned NW	>5 μm	20–200