Mirza I, O'Connell G, Wang J J, Lunney J G
School of Physics and CRANN, Trinity College Dublin, Dublin 2, Ireland.
Nanotechnology. 2014 Jul 4;25(26):265301. doi: 10.1088/0957-4484/25/26/265301. Epub 2014 Jun 11.
Nanoparticle (NP) films of silver were prepared using nanosecond (ns) and femtosecond (fs) pulsed laser deposition (PLD) in vacuum. The flux and energy distribution of the ions in the plasma part of the ablation plume were measured using a Langmuir ion probe. The deposition energy efficiencies of ns and fs silver PLD were also compared. For equivalent thickness up to ∼3 nm the NPs made by ns-PLD are well separated and roughly circular, but for higher thicknesses the NPs begin to coalesce. For equivalent thickness up to 7 nm the fs films are comprised of well separated NPs, though the mean NP size and the surface coverage increase with equivalent thickness. The mean Feret diameter for both ns- and fs-PLD films increases with increasing equivalent solid-density thickness. The surface plasmon resonance peak was observed to red shift for both ns- and fs-PLD films as the equivalent solid-density thickness was increased from 1 nm to 7 nm.
采用纳秒（ns）和飞秒（fs）脉冲激光沉积（PLD）技术在真空中制备了银纳米颗粒（NP）薄膜。使用朗缪尔离子探针测量了烧蚀羽流等离子体部分中离子的通量和能量分布。还比较了纳秒和飞秒银PLD的沉积能量效率。对于等效厚度达约3nm的情况，由纳秒PLD制备的NP相互分离良好且大致呈圆形，但对于更高的厚度，NP开始合并。对于等效厚度达7nm的情况，飞秒薄膜由相互分离良好的NP组成，不过平均NP尺寸和表面覆盖率随等效厚度增加。纳秒和飞秒PLD薄膜的平均费雷特直径均随等效固体密度厚度的增加而增大。当等效固体密度厚度从1nm增加到7nm时，纳秒和飞秒PLD薄膜的表面等离子体共振峰均出现红移。
