Radical Chemistry in a Femtosecond Laser Plasma: Photochemical Reduction of Ag+ in Liquid Ammonia Solution
| Autor: | Katharine Moore Tibbetts, Syeda Ahsan, Victoria Kathryn Meader, Mallory G. John, Laysa M. Frias Batista |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Silver
Free Radicals Radical Metal ions in aqueous solution Metal Nanoparticles Pharmaceutical Science hydrogen peroxide 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences Article Silver nanoparticle peroxynitrite Analytical Chemistry lcsh:QD241-441 chemistry.chemical_compound Ammonia lcsh:Organic chemistry femtosecond laser Drug Discovery Physical and Theoretical Chemistry radical scavenger liquid ammonia metal nanoparticle Hydrogen peroxide Lasers Organic Chemistry Photochemical Processes 021001 nanoscience & nanotechnology 0104 chemical sciences Solutions Models Chemical chemistry Chemistry (miscellaneous) Femtosecond Molecular Medicine Hydroxyl radical 0210 nano-technology Peroxynitrite |
| Zdroj: | Molecules, Vol 23, Iss 3, p 532 (2018) Molecules; Volume 23; Issue 3; Pages: 532 Molecules : A Journal of Synthetic Chemistry and Natural Product Chemistry |
| ISSN: | 1420-3049 |
| Popis: | Plasmas with dense concentrations of reactive species such as hydrated electrons and hydroxyl radicals are generated from focusing intense femtosecond laser pulses into aqueous media. These radical species can reduce metal ions such as Au3+ to form metal nanoparticles (NPs). However, the formation of H2O2 by the recombination of hydroxyl radicals inhibits the reduction of Ag+ through back-oxidation. This work has explored the control of hydroxyl radical chemistry in a femtosecond laser-generated plasma through the addition of liquid ammonia. The irradiation of liquid ammonia solutions resulted in a reaction between NH3 and OH·, forming peroxynitrite and ONOO−, and significantly reducing the amount of H2O2 generated. Varying the liquid ammonia concentration controlled the Ag+ reduction rate, forming 12.7 ± 4.9 nm silver nanoparticles at the optimal ammonia concentration. The photochemical mechanisms underlying peroxynitrite formation and Ag+ reduction are discussed. |
| Databáze: | OpenAIRE |
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