Role of Solvent in Electron‐Phonon Relaxation Dynamics in Core‐Shell Au−SiO 2 Nanoparticles

Autor:	Anindya Datta, Bala Gopal Maddala, Fariyad Ali, Hemen Gogoi
Rok vydání:	2021
Předmět:	Materials science Relaxation (NMR) Physics::Optics Electron Dissipation Atomic and Molecular Physics and Optics Condensed Matter::Materials Science Thermal conductivity Chemical physics Excited state Ultrafast laser spectroscopy Physical and Theoretical Chemistry Plasmon Excitation
Zdroj:	ChemPhysChem. 22:2201-2206
ISSN:	1439-7641 1439-4235
DOI:	10.1002/cphc.202100592
Popis:	Relaxation dynamics of plasmons in Au-SiO2 core-shell nanoparticles have been followed by femtosecond pump-probe technique. The effect of excitation pump energy and surrounding medium on the time constants associated with the hot electron relaxation has been elucidated. A gradual increase in the electron-phonon relaxation time with pump energy is observed and can be attributed to the higher perturbation of the electron distribution in AuNPs at higher pump energy. Variation in time constants for the electron-phonon relaxation in different solvents is rationalized on the basis of their thermal conductivities, which govern the rate of dissipation of heat of photoexcited electrons in the nanoparticles. On the other hand, phonon-phonon relaxation is found to be much less effective than electron-phonon relaxation for the dissipation of energy of the excited electron and the time constants associated with it remain unaffected by thermal conductivity of the solvent.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5740cc6be8b64fff49741a01a2f381a5 https://doi.org/10.1002/cphc.202100592 Zobrazit plný text záznamu Plný text