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The Effect of Gold Nanoparticle Concentration and Laser Fluence on the Laser-Induced Water Decomposition

Simakin, Aleksander V., Astashev, Maxim E., Baimler, Ilya V., Uvarov, Oleg V., Voronov, Valery V., Vedunova, Maria V., Sevost’yanov, Mikhail A., Belosludtsev, Konstantin N., Gudkov, Sergey V.
TheJournal of physical chemistry 2019 v.123 no.8 pp. 1869-1880
acoustics, ethanol, ethyl ether, hydrogen, hydrogen peroxide, irradiation, nanogold, nanoparticles, oxygen, solvents
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 10¹⁰ 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 10¹⁰ NP/mL, laser irradiation of the colloid caused formation of molecular hydrogen, hydrogen peroxide, and molecular oxygen. If the concentration of nanoparticles exceeded 10¹¹ 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.