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

Ali Al-Otaify; Marina A. Leontiadou; Flavia V E Dos Reis; Tatiana C. Damato; Pedro H C Camargo; David J. Binks

doi:10.1039/c4cp01475h

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

Ali Al-Otaify, Marina A. Leontiadou, Flavia V E Dos Reis, Tatiana C. Damato, Pedro H C Camargo, David J. Binks

Research output: Contribution to journal › Article › peer-review

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. This journal is © the Partner Organisations 2014.

Original language	English
Pages (from-to)	14189-14194
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue number	27
DOIs	https://doi.org/10.1039/c4cp01475h https://doi.org/10.1039/C4CP01475H
Publication status	Published - 21 Jul 2014

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title = "Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres",

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. This journal is {\textcopyright} the Partner Organisations 2014.",

author = "Ali Al-Otaify and Leontiadou, {Marina A.} and {Dos Reis}, {Flavia V E} and Damato, {Tatiana C.} and Camargo, {Pedro H C} and Binks, {David J.}",

year = "2014",

month = jul,

day = "21",

doi = "10.1039/c4cp01475h",

language = "English",

volume = "16",

pages = "14189--14194",

journal = "Physical Chemistry Chemical Physics",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Size dependence of ultrafast charge dynamics in monodisperse Au nanoparticles supported on TiO2 colloidal spheres

AU - Al-Otaify, Ali

AU - Leontiadou, Marina A.

AU - Dos Reis, Flavia V E

AU - Damato, Tatiana C.

AU - Camargo, Pedro H C

AU - Binks, David J.

PY - 2014/7/21

Y1 - 2014/7/21

N2 - 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. This journal is © the Partner Organisations 2014.

AB - 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. This journal is © the Partner Organisations 2014.

U2 - 10.1039/c4cp01475h

DO - 10.1039/c4cp01475h

M3 - Article

SN - 1463-9076

VL - 16

SP - 14189

EP - 14194

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 27

ER -

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

Abstract

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