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

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Victoria Kathryn MeaderKatharine Moore Tibbetts

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.

References

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Aug 17, 2017·The Journal of Physical Chemistry. a·Victoria Kathryn MeaderKatharine Moore Tibbetts

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Citations

Nov 10, 2018·Physical Chemistry Chemical Physics : PCCP·Collin J RodriguesKatharine Moore Tibbetts
May 28, 2019·Journal of Cataract and Refractive Surgery·Yoichiro MasudaTadashi Nakano
Aug 14, 2020·Physical Chemistry Chemical Physics : PCCP·Julian A BobbKatharine Moore Tibbetts
Apr 4, 2021·Nanomaterials·Ashish NagKatharine Moore Tibbetts
Jan 31, 2019·The Journal of Physical Chemistry. B·Aleksander V SimakinSergey V Gudkov
Jul 30, 2019·The Journal of Physical Chemistry. B·Laysa M Frias BatistaKatharine Moore Tibbetts
Jan 14, 2021·The Journal of Physical Chemistry. B·Christopher M NguyenKatharine Moore Tibbetts

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Methods Mentioned

BETA
Raman spectroscopy
surface plasmon resonance

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