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FESEM images of MgO nanowires grown on MgO (100) single crystal substrate when varying the ambient oxygen pressure. The images are taken when the angle was tilted 60° to the substrate surface plane. The ambient oxygen pressures were (a) 0.01, (b) 0.1, (c) 1, and (d) .
(Color online) Ambient pressure dependence on the length of MgO nanowires under oxygen and/or argon atmospheres. Each sample was deposited for . (a) The opened circles show the data for nanowires grown under oxygen atmosphere, and the closed circles represent the data under argon atmosphere. (b) Length distribution data of nanowires grown under oxygen atmosphere are shown. (c) Shows the EDS data of nanowires grown under of argon atmosphere.
HRTEM images of MgO nanowires. (a) and (b) show the images of nanowires grown under oxygen atmosphere with the ambient pressures of (a) 10 and (b) , respectively. Image (c) is of nanowire grown under argon atmosphere with the ambient pressures of .
(Color online) Time dependences on the nanowire length under different ambient oxygen pressures. Green squares show the data with the ambient pressure of , and the red circles are the data with the ambient pressure of . Inset: lower FESEM image shows the morphologies of nanowires grown for with the ambient pressure of , showing the disappearance of catalyst droplet and the sidewall growth. The upper FESEM image displays the nanowire morphologies grown for with the ambient pressure of , showing long nanowires up to .
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