Effect of ablated particle flux on MgO nanowire growth by pulsed laser deposition
Effect of ablated particle flux on MgO nanowire growth by pulsed laser deposition
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DOI：
10.1063/1.2751077
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发表时间：
2007-07
影响因子：
3.2
通讯作者：
A. Marcu;T. Yanagida;K. Nagashima;Hidekazu Tanaka;T. Kawai
中科院分区：
文献类型：
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作者：
A. Marcu;T. Yanagida;K. Nagashima;Hidekazu Tanaka;T. Kawai
使用脉冲激光沉积（PLD）生长氧化物纳米线是一种很有前途的工艺，因为这本质上允许通过异质结构将各种过渡金属氧化物的丰富功能结合到纳米线中。在这里，我们研究了烧蚀粒子通量对 PLD 氧化镁纳米线生长的影响。当改变烧蚀材料和基底之间的距离时，不同羽流膨胀时间产生的烧蚀粒子通量的微小变化主要影响生长速率，同时保持生长状态。然而，改变激光能量不仅会改变生长速率，还会改变生长状态。低于激光能量的临界值时，表面形态倾向于显示岛状生长而不是纳米线生长。我们将这种阈值的存在归因于催化剂液滴的解吸过程。
Oxide nanowire growth using a pulsed laser deposition (PLD) is a promising process since this essentially allows incorporating a rich functionality of various transition metal oxides into nanowires via the heterostructures. Here we investigate the effect of ablated particle flux on magnesium oxide nanowire growth by PLD. When varying the distance between the ablated material and the substrate, the small variation in ablated particle flux generated by a different plume expansion time influences mainly the growth rate while keeping the growth regime. However, varying the laser energy changes not only the growth rate but also the growth regime. Below a critical value of the laser energy the surface morphology tends to show an island growth rather than a nanowire growth. We attribute the existence of such a threshold to the desorption process from the catalyst droplet.