Effect of surface plasmon resonance in TiO2/Au thin films on the fluorescence of self-assembled CdTe QDs structure


Autoria(s): Moura, I.; Cerqueira, M. F.; Melnikau, D.; Savateeva, D.; Rakovich, Yury Petrovich; Borges, J.; Vaz, F.; Vasilevskiy, M.
Data(s)

09/05/2016

09/05/2016

2015

Resumo

23rd Congress of the International Comission for Optics (ICO 23)

The exceptional properties of localised surface plasmons (LSPs), such as local field enhancement and confinement effects, resonant behavior, make them ideal candidates to control the emission of luminescent nanoparticles. In the present work, we investigated the LSP effect on the steady-state and time-resolved emission properties of quantum dots (QDs) by organizing the dots into self-assembled dendrite structures deposited on plasmonic nanostructures. Self-assembled structures consisting of water-soluble CdTe mono-size QDs, were developed on the surface of co-sputtered TiO2 thin films doped with Au nanoparticles (NPs) annealed at different temperatures. Their steady-state fluorescence properties were probed by scanning the spatially resolved emission spectra and the energy transfer processes were investigated by the fluorescence lifetime imaging (FLIM) microscopy. Our results indicate that a resonant coupling between excitons confined in QDs and LSPs in Au NPs located beneath the self-assembled structure indeed takes place and results in (i) a shift of the ground state luminescence towards higher energies and onset of emission from excited states in QDs, and (ii) a decrease of the ground state exciton lifetime (fluorescence quenching).

Identificador

Journal of Physics Conference Series 605 2015 : (2015) // Article ID 012025

1742-6588

http://hdl.handle.net/10810/18201

10.1088/1742-6596/605/1/012025

Idioma(s)

eng

Publicador

IOP Publishing

Relação

http://iopscience.iop.org/article/10.1088/1742-6596/605/1/012025/meta#artAbst

Direitos

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

info:eu-repo/semantics/openAccess

Palavras-Chave #quantum dots #energy-transfer #nanocrystals
Tipo

info:eu-repo/semantics/article