Features of nanosecond transient absorption of Ag nanoparticles with manifestations of electron gas degeneracy
Ibrayev N. Seliverstova E. Kucherenko M.
May 2022Elsevier B.V.
Journal of Luminescence
2022#245
The transient absorption of Ag nanoparticles with various sizes under photoexcitation by nanosecond laser pulses was studied. It was found that the transient absorption band of silver nanoparticles with a maximum at 380 nm has a fine structure and does not depend on the nanoparticle size. A theoretical explanation of the observed fine structure of the transient absorption spectrum is proposed based on the hypothesis of the electron gas degeneracy in the metal nanoparticles. The dependencies of the intensity and lifetime of the transient absorption on the average size of nanoparticles, their concentration, and the energy density of laser excitation were investigated. To explain the observed processes, a mathematical model was proposed that considers a prolonged relaxation process in a colloidal system as a manifestation of hindered heat transfer with the environment. It is shown that the absorption kinetics is prolonged up to times of the order of several tens of nanoseconds in the case of the delayed heterophase heat transfer at the “particle–medium” interface.
Ag nanoparticles , Electron gas degeneracy , Nanosecond excitation , Plasmon , Transient absorption
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Institute of Molecular Nanophotonics, Buketov Karaganda University, Universitetskaya St. 28, Karaganda, 100024, Kazakhstan
Orenburg State University, Pobedy Ave. 13, Orenburg, 460018, Russian Federation
Institute of Molecular Nanophotonics
Orenburg State University
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