Abstract
The electron excitations dynamics in spherical Au/SiO\(_2\) core-shell nanoparticles excited by 150 fs laser pulses at wavelength of 400 nm was studied by femtosecond transient absorption spectroscopy. It is shown that the electron–phonon and phonon-phonon relaxation times in a nanoparticle increase in the presence of SiO\(_2\) dielectric shell. The obtained transient extinction kinetics of NPs was used to fit the theoretical profile with the relaxation temperature of the excitation dynamics of electron and lattice nanoparticles, as well as their environment under the laser pulses action. The electron–phonon coupling and phonon-phonon relaxation constants for Au/SiO\(_2\) NPs and Au NPs have been established. For Au/SiO\(_2\) core-hell nanoparticles, the electron–phonon coupling constant was \(\gamma _{core/shell}=5\cdot 10^{16}\) \(W\cdot m^{-3}\cdot K^{-1}\), and the heat loss constant was \(h_{core/shell}=4\cdot 10^{8}\) \(W\cdot m^{-2}\cdot K^{-1}\). In the case of gold nanospheres, these constants are \(\gamma _{NPs}=7\cdot 10^{16}\) \(W\cdot m^{-3}\cdot K^{-1}\) and \(h_{NPs}=8\cdot 10^{8}\) \(W\cdot m^{-2}\cdot K^{-1}\), respectively. It is concluded that the SiO\(_2\) dielectric shell prevents the defragmentation of the gold core when it reaches the melting point.
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Acknowledgements
Results of TEM investigations with the Libra 120 TEM were obtained on the equipment of the Center of collective usage of scientific equipment of Voronezh State University.
Funding
These studies were supported by the Russian Foundation for Basic Research under Grant No. 20-52-81005, the Belarusian Republican Foundation for Fundamental Research under Grant No. 20EA-006, and the Vietnam Academy of Sciences and Technology under Grant No. QTRU05.02/21-23. The study was supported by the Ministry of Science and Higher Education of the Russian Federation under Agreement No. 075-15-2021-1351 in part of structural analysis of gold nanoparticles.
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Mikhail Smirnov: investigation, data curation, writing—original draft preparation. Tamara Chevychelova: methodology, investigation, prepared figures. Oleg Ovchinnikov: conceptualization, writing—original draft preparation. Andrey Zvyagin: investigation, prepared figures. Sergey Tikhomirov: conceptualization, writing—original draft preparation. Alina Ponyavina: investigation, prepared figures and manuscript file. Pham Hong Minh: methodology, investigation. Nguyen Thanh Binh: methodology, investigation.
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Smirnov, M., Chevychelova, T., Ovchinnikov, O. et al. Effect of Silica Shell on Electronic Excitations Dynamics in Au/SiO\(_2\) Core/Shell Nanoparticles. Plasmonics 19, 311–318 (2024). https://doi.org/10.1007/s11468-023-01982-y
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DOI: https://doi.org/10.1007/s11468-023-01982-y