Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres

Al-Otaify, A; Leontiadou, M; dos Reis, FVE; Damato, TC; Camargo, PHC; Binks, DJ

Abstract

Sub-nanosecond charge dynamics in monodisperse Au nanoparticles (NPs) supported on TiO2 colloidal spheres are studied as a function of NP diameter using ultrafast transient absorption spectroscopy. The decay of the transmittance changes observed in the region of the plasmon resonance of the Au NPs following photoexcitation of the TiO2 spheres are well-described by a bi-exponential function consisting of a fast component of 2 ps duration associated with electron–phonon scattering, followed by a slow and relatively weak component associated with phonon–phonon scattering. The decay constant characterising the latter component was found to be dependent on the size of the Au NPs, rising from 49 ± 3 to 128 ± 6 ps as the diameter of the Au NPs increased from 12.2 ± 2.2 nm to 24.5 ± 2.8 nm, respectively.

Citation

Al-Otaify, A., Leontiadou, M., dos Reis, F., Damato, T., Camargo, P., & Binks, D. (2014). Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres. Physical Chemistry Chemical Physics, 16, 14189-14194. https://doi.org/10.1039/c4cp01475h

• Journal Article Type: Article
• Acceptance Date: Jun 2, 2014
• Online Publication Date: Jun 2, 2014
• Publication Date: Jun 2, 2014
• Deposit Date: Apr 2, 2019
• Journal: Physical Chemistry Chemical Physics
• Print ISSN: 1463-9076
• Electronic ISSN: 1463-9084
• Publisher: Royal Society of Chemistry
• Volume: 16
• Pages: 14189-14194
• DOI: https://doi.org/10.1039/c4cp01475h
• Publisher URL: https://doi.org/10.1039/c4cp01475h
• Related Public URLs: https://pubs.rsc.org/en/journals/journalissues/cp#!recentarticles&adv