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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.