脉冲激光烧蚀法制备Ag纳米粒子胶体

Preparation of Silver Nanoparticles Colloid by Pulsed Laser Ablation

为了研究激光参数对Ag纳米粒子胶体的影响,采用不同重复率和能量密度的脉冲激光对蒸馏水中的Ag靶烧蚀10 min来制备Ag纳米粒子胶体.通过透射电镜(TEM)和紫外-可见(UV-Vis)分光光度计分析了Ag纳米粒子胶体的大小、形貌和吸收光谱,同时由Image-ProPlus软件分析计算了粒子的平均粒径及其分布.结果表明,由重复率为10 Hz,能量密度为4.2 J/cm2的脉冲激光烧蚀10 min后制备的Ag胶体纳米粒子平均粒径最小(D=17.54 nm),粒径分布最窄(δ=36.86 nm),且形貌较均匀.从而证实了通过调节激光参数来控制纳米粒子尺寸和形貌的可行性.另外,在实验基础上,应用熔化生长"与爆炸"模型讨论了激光烧蚀工艺参数对Ag纳米粒子胶体的影响规律.

Silver nanoparticles colloid was prepared by pulsed laser ablation of silver target for 10 min in distilled water at different repetition rate and laser fluenee to study the effect of laser ablation parameters on the silver nanopartieles colloid. Particles size, morphology and absorption spectroscopy of the obtained nanopartieles colloid were characterized by ultraviolet to visible （UV-Vis） speetrophotometer and transmission electron microscope （TEM）, and the average diameter and diameter distribution were analyzed by Image-ProPlus software. The results showed that the average diameter of the silver nanopartieles prepared at repetition rate of 10 Hz and laser fluenee of 4.2 J/cm^2 was the smallest （D = 17.54 nm）, the distribution of particle size was narrowest （δ = 36.86 nm） and the morphologies were fairly homogeneous. So it was confirmed that control of nanopartieles size and shape was possible by laser ablation parameters. In addition, based on the experimental results, the effects of laser ablation parameters on the silver nanopartieles colloid was discussed in terms of fragmentation and melting induced aggregation of colloidal particles by self-absorption of laser pulses.