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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。
In aqueous solution, pulsed laser ablation was used to prepare vanadium phthalocyanine (VOPc) nanoparticle. The atomic force microscopy (AFM) observation showed that the average diameter of VOPc nanoparticles with pulse energy density The larger and larger. The UV-Vis absorption spectra of its nanoparticle colloidal aqueous solution show that too long a laser ablation time does not provide a sustained contribution to the nanoparticle output. The reaggregation of nanoparticles directly affects the preparation efficiency and the size of the prepared nanoparticles, eventually bringing the nanoparticles to equilibrium with the output of the nanoparticles. Hydrophobic forces in the aqueous solution are the main reasons for the reaggregation of the nanoparticles.