Prokhorov General Physics Institute of the Russian Academy of Sciences , 38 Vavilova St. , Moscow 119991 , Russia.
Institute of Cell Biophysics of the Russian Academy of Sciences , 3 Institutskaya St. , Pushchino, Moscow Region 119991 , Russia.
J Phys Chem B. 2019 Feb 28;123(8):1869-1880. doi: 10.1021/acs.jpcb.8b11087. Epub 2019 Feb 14.
This Article covers the influence of the concentration of gold nanoparticles on laser-induced water decomposition. It was established that addition of gold nanoparticles intensifies laser-induced water decomposition by almost 2 orders of magnitude. The water decomposition rate was shown to be maximal at a nanoparticle concentration around 10 NP/mL, whereas a decrease or increase of nanoparticle concentration leads to a decrease of water decomposition rate. It was demonstrated that, if the concentration of nanoparticles in water-based colloid was less than 10 NP/mL, laser irradiation of the colloid caused formation of molecular hydrogen, hydrogen peroxide, and molecular oxygen. If the concentration of nanoparticles exceeded 10 NP/mL, only two products, molecular hydrogen and hydrogen peroxide, were formed. Correlations between the water decomposition rate and the main optical and acoustic parameters of optical breakdown-generated plasma were investigated. Variants of laser-induced decomposition of colloidal solutions of nanoparticles based on organic solvents (ethanol, propanol-2, butanol-2, diethyl ether) were also analyzed.
本文研究了金纳米粒子的浓度对激光诱导水分解的影响。研究结果表明，添加金纳米粒子可使激光诱导水分解的速率增强近 2 个数量级。研究发现，纳米粒子的浓度约为 10 NP/mL 时，水分解速率达到最大值，而纳米粒子浓度的降低或升高都会导致水分解速率的降低。研究结果还表明，如果水基胶体中的纳米粒子浓度小于 10 NP/mL，则胶体的激光辐照会导致分子氢、过氧化氢和分子氧的形成。如果纳米粒子的浓度超过 10 NP/mL，则只会形成两种产物，即分子氢和过氧化氢。本文还研究了水分解速率与光击穿等离子体主要光学和声学参数之间的关系，并分析了基于有机溶剂（乙醇、异丙醇-2、正丁醇-2、二乙醚）的纳米粒子胶体的激光诱导分解的各种变体。
