Creation and luminescence of size-selected gold nanorods

Yu Chen, Yinan Zhang, David Birch, Amanda S. Barnard

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Fluorescent metal nanoparticles have attracted great interest in recent years for their unique properties and potential applications. Their optical behaviour depends not only on size but also on shape, and will only be useful if the morphology is stable. In this work, we produce stable size-selected gold nanorods (aspect ratio 1-2) using a size-selected cluster source and correlate their luminescence behaviour with the particle shape. Thermodynamic modelling is used to predict the preferred aspect ratio of 1.5, in agreement with the observations, and confirms that the double-icosahedron observed in experiments is significantly lower in energy than the alternatives. Using these samples a fluorescence lifetime imaging microscopy study observed two photon luminescence from nanoparticle arrays and a fast decay process (<100 ps luminescence lifetime), which are similar to those found from ligand stabilized gold nanorods under the same measurement conditions, indicating that a surface plasmon enhanced two-photon excitation process is still active at these small sizes. By further reducing the nanoparticle size, this approach has the potential to investigate size-dependent luminescence behaviour at smaller sizes than has been possible before.

LanguageEnglish
Pages5017-5022
Number of pages6
JournalNanoscale
Volume4
Issue number16
Early online date14 Jun 2012
DOIs
Publication statusPublished - 2012

Fingerprint

Nanorods
Gold
Luminescence
Aspect ratio
Photons
Nanoparticles
Metal nanoparticles
Microscopic examination
Fluorescence
Ligands
Thermodynamics
Imaging techniques
Experiments

Keywords

  • metal nanoparticles
  • particle shape
  • thermodynamic modelling
  • gold nanorods

Cite this

Chen, Yu ; Zhang, Yinan ; Birch, David ; Barnard, Amanda S. / Creation and luminescence of size-selected gold nanorods. In: Nanoscale. 2012 ; Vol. 4, No. 16. pp. 5017-5022.
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Creation and luminescence of size-selected gold nanorods. / Chen, Yu; Zhang, Yinan; Birch, David; Barnard, Amanda S.

In: Nanoscale, Vol. 4, No. 16, 2012, p. 5017-5022.

Research output: Contribution to journalArticle

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AU - Zhang, Yinan

AU - Birch, David

AU - Barnard, Amanda S.

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AB - Fluorescent metal nanoparticles have attracted great interest in recent years for their unique properties and potential applications. Their optical behaviour depends not only on size but also on shape, and will only be useful if the morphology is stable. In this work, we produce stable size-selected gold nanorods (aspect ratio 1-2) using a size-selected cluster source and correlate their luminescence behaviour with the particle shape. Thermodynamic modelling is used to predict the preferred aspect ratio of 1.5, in agreement with the observations, and confirms that the double-icosahedron observed in experiments is significantly lower in energy than the alternatives. Using these samples a fluorescence lifetime imaging microscopy study observed two photon luminescence from nanoparticle arrays and a fast decay process (<100 ps luminescence lifetime), which are similar to those found from ligand stabilized gold nanorods under the same measurement conditions, indicating that a surface plasmon enhanced two-photon excitation process is still active at these small sizes. By further reducing the nanoparticle size, this approach has the potential to investigate size-dependent luminescence behaviour at smaller sizes than has been possible before.

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