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Molecules 2018, 23(3), 532; https://doi.org/10.3390/molecules23030532

Radical Chemistry in a Femtosecond Laser Plasma: Photochemical Reduction of Ag+ in Liquid Ammonia Solution

Department of Chemistry, Virginia Commonwealth University, Richmond, VA 23220, USA
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Received: 9 February 2018 / Revised: 23 February 2018 / Accepted: 25 February 2018 / Published: 27 February 2018
(This article belongs to the Special Issue Radical Chemistry)
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Abstract

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. View Full-Text
Keywords: femtosecond laser; radical scavenger; hydrogen peroxide; liquid ammonia; peroxynitrite; metal nanoparticle femtosecond laser; radical scavenger; hydrogen peroxide; liquid ammonia; peroxynitrite; metal nanoparticle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Meader, V.K.; John, M.G.; Frias Batista, L.M.; Ahsan, S.; Tibbetts, K.M. Radical Chemistry in a Femtosecond Laser Plasma: Photochemical Reduction of Ag+ in Liquid Ammonia Solution. Molecules 2018, 23, 532.

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