Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 27, Pages 14189-14194Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp01475h
Keywords
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Funding
- Ministry of Higher Education of Saudi Arabia
- EPSRC [EP/K008544/1]
- FAPESP [2013/19861-6]
- CNPq [471245/2012-7]
- CNPq
- Engineering and Physical Sciences Research Council [EP/K008544/1, EP/K008587/1] Funding Source: researchfish
- EPSRC [EP/K008544/1, EP/K008587/1] Funding Source: UKRI
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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.
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