脉冲能量密度和照射时间对激光消融制备有机染料纳米颗粒的影响

Impact of Pulse Energy Density and Irradiation Time on Organic Dye Nanoparticles Preparation by Laser Ablation

在水溶液中利用脉冲激光消融制备有机染料——酞菁氧钒(VOPc)纳米颗粒,利用原子力显微镜(AFM)观测显示,在入射光总能量一定的前提下VOPc纳米颗粒的平均直径随脉冲能量密度的增大而变大。其纳米颗粒胶状水溶液的紫外-可见(UV-Vis)吸收光谱显示,过长的激光消融时间并不能对纳米颗粒的产出提供持续贡献。纳米颗粒的再聚集直接影响了制备效率和制备所得纳米颗粒的尺寸,最终将和纳米颗粒的产出达到动态平衡,而水溶液中的疏水作用力是造成纳米颗粒再聚集的主要原因。

Organic dyes such as vanadium（IV） oxo（phthalocyaninato）（VOPc） nanoparticles have been fabricated by pulse laser ablation in aqueous solution.Under the condition of the same total incident light energy,the average diameter of VOPc nanoparticles,observed by an atomic force microscopy（AFM）,increases with the pulse laser energy density.The ultraviolet-visible light（UV-Vis） absorption spectrum of VOPc nanoparticles colloid solution indicates that there is no more contribution for producing nanoparticles by so longer laser irradiation time.The nanoparticles reaggregation directly influences the preparation efficiency and the size of the produced nanoparticles,and finally it will achieve dynamic equilibrium with the process of producing nanoparticles.In aqueous solution the hydrophobic force is the main reason for the nanoparticles reaggregation.