论文部分内容阅读
Magnesium oxide(MgO) nanowires were synthesized on the gold-coated Si(100) and MgO(100) substrates at lower temperature(600℃) by pulsed liquid injection metal organic chemical vapor deposition(MOCVD). The gold catalyst could be found on the tips of nanowires, which presents the vapor-liquid-solid(VLS) growth mechanism. Reactive species(oxygen or magnesium) have strong effects on the growth of nanowires. Abundant reactive species kill the vertically aligned nanowires to be randomly aligned ones or even change the vertical growth mode to the horizontal growth mode with surface-parallel nanowires. Usually, nanowires with larger aspect ratio(>10, aspect ratio=length/diameter), higher density(>500/μm2) and smaller diameter(≤20 nm) can be easily synthesized with longer injection period(≥2 s), smaller injection mass/period(≤4.6 mg) and suitable oxygen partial pressure(2.4 Torr).
Magnesium oxide (MgO) nanowires were synthesized on the gold-coated Si (100) and MgO (100) substrates at lower temperature (600 ℃) by pulsed liquid injection metal organic chemical vapor deposition on the tips of nanowires, which presents the vapor-liquid-solid (VLS) growth mechanism. Reactive species (oxygen or magnesium) have strong effects on the growth of nanowires. Abundant reactive species kill the vertically aligned nanowires to be randomly aligned ones or even change the vertical growth mode to the horizontal growth mode with surface-parallel nanowires. [0005] Generally, nanowires with larger aspect ratios (> 10, aspect ratio = length / diameter), higher density nm) could be easily synthesized with longer injection period (≥2 s), smaller injection mass / period (≤4.6 mg) and suitable oxygen partial pressure (2.4 Torr).