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

Result description

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.

Keywords

Au nanoparticlesnon-adiabatic molecular dynamicsplasmonics

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

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

  • Original language description

    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.

  • Czech name

  • Czech description

Classification

  • Type

    Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BM - Solid-state physics and magnetism

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2016

  • Confidentiality

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

Data specific for result type

  • Name of the periodical

    Journal of Physical Chemistry Letters

  • ISSN

    1948-7185

  • e-ISSN

  • Volume of the periodical

    7

  • Issue of the periodical within the volume

    8

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    7

  • Pages from-to

    1563-1569

  • UT code for WoS article

    000374810800026

  • EID of the result in the Scopus database

    2-s2.0-84968831719

Basic information

Result type

Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

Jx

CEP

BM - Solid-state physics and magnetism

Year of implementation

2016