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(Color online) (a) Au dot pattern as catalyst before nanowire growth, (b) the top view, (c) the tilted (60°) images of MgO nanowire arrays grown on MgO (100) substrates and (d) the FESEM images of the nanowire arrays with the interwire spacing of 150, 500, and 1000 nm, respectively. Inset in (c) shows the Au catalyst at the tip of MgO nanowires.
(Color online) Growth rate of MgO nanowire as a function of the interwire-spacing. The dotted line is the growth rate of the thin film prepared at room temperature: Inset shows the nanowire length as a function of the growth time with interwire distance of 1000 nm.
(Color online) (a) Growth rate of MgO thin films deposited under 800 °C as a function of PO2 and (b) the interwire-spacing dependence of total volume (volume per unit area) for MgO nanowires. The nanowire volumes were estimated from the density, length, and diameter of nanowires. Red line shows the volume of the films prepared at room temperature, i.e., total amount of supplied species.
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