金ナノ粒子濃度とレーザーフルエンスがレーザー誘起水分解に与える影響
This study examined how gold nanoparticle (AuNP) concentration modulates laser-induced decomposition of water. The presence of AuNPs was found to amplify the decomposition rate by approximately two orders of magnitude compared with pure water. A peak decomposition rate was observed at a nanoparticle concentration of approximately 10 NP/mL; deviations above or below this value reduced the rate. At concentrations below 10 NP/mL, laser irradiation produced three species—molecular hydrogen (H2), hydrogen peroxide (H2O2), and molecular oxygen (O2)—whereas above this threshold only H2 and H2O2 were detected. Relationships between the decomposition rate and optical and acoustic characteristics of plasma generated by optical breakdown were also characterized. Additionally, laser-induced decomposition behavior in organic solvent-based colloidal systems, including ethanol, propanol-2, butanol-2, and diethyl ether, was investigated.
Gold nanoparticles enhance laser-induced water decomposition via optical breakdown plasma generation; product composition (H2, H2O2, O2) shifts depending on nanoparticle concentration, with O2 absent above 10 NP/mL.
This is basic research at the cellular or molecular level. For human application, inhalation is the most promising delivery route, but inhalation carries explosion risk and concentration matters (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/30696249