Slow relaxation of surface plasmon excitations in Au55: the key to efficient plasmonic heating in Au/TiO2

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F16%3A00471539" target="_blank" >RIV/68378271:_____/16:00471539 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/16:00369803

Výsledek na webu

<a href="http://dx.doi.org/10.1021/acs.jpclett.6b00283" target="_blank" >http://dx.doi.org/10.1021/acs.jpclett.6b00283</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpclett.6b00283" target="_blank" >10.1021/acs.jpclett.6b00283</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Slow relaxation of surface plasmon excitations in Au55: the key to efficient plasmonic heating in Au/TiO2

Popis výsledku v původním jazyce

Gold nanoparticles distinguish themselves from other nanoparticles due to their unique surface plasmon resonance properties that can be exploited for a multiplicity of applications. The promise of plasmonic heating in systems of Au nanoparticles on transition metal oxide supports, for example, Au/TO2, rests with the ability of the surface plasmon in Au nanoparticles to effectively transfer energy into the transition metal oxide. Here, we report a critical observation regarding Au nanoparticle (Au-55) surface plasmon excitations, that is, the relaxation of the surface plasmon excitation is very slow, on the order of several picoseconds. Starting from five plasmon states in Au-55 nanoparticles using nonadiabatic molecular dynamics simulations, we find that the relaxation time constant resulting from these simulations is similar to 6.8 ps, mainly resulting from a long-lived intermediate state found at around0.8 eV. This long-lived intermediate state aligns with the conduction band edge of TiO2, thereby facilitating energy transfer injection from the Au-55 nanoparticle into the TiO2. The current results rule out the previously reported molecular-like relaxation dynamics for Au-55.

Název v anglickém jazyce

Slow relaxation of surface plasmon excitations in Au55: the key to efficient plasmonic heating in Au/TiO2

Popis výsledku anglicky

Gold nanoparticles distinguish themselves from other nanoparticles due to their unique surface plasmon resonance properties that can be exploited for a multiplicity of applications. The promise of plasmonic heating in systems of Au nanoparticles on transition metal oxide supports, for example, Au/TO2, rests with the ability of the surface plasmon in Au nanoparticles to effectively transfer energy into the transition metal oxide. Here, we report a critical observation regarding Au nanoparticle (Au-55) surface plasmon excitations, that is, the relaxation of the surface plasmon excitation is very slow, on the order of several picoseconds. Starting from five plasmon states in Au-55 nanoparticles using nonadiabatic molecular dynamics simulations, we find that the relaxation time constant resulting from these simulations is similar to 6.8 ps, mainly resulting from a long-lived intermediate state found at around0.8 eV. This long-lived intermediate state aligns with the conduction band edge of TiO2, thereby facilitating energy transfer injection from the Au-55 nanoparticle into the TiO2. The current results rule out the previously reported molecular-like relaxation dynamics for Au-55.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry Letters

ISSN

1948-7185

e-ISSN

—

Svazek periodika

7

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

1563-1569

Kód UT WoS článku

000374810800026

EID výsledku v databázi Scopus

2-s2.0-84968831719