Creation and luminescence of size-selected gold nanorods

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...

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Bibliographic Details
Published in:Nanoscale 2012-08, Vol.4 (16), p.5017-5022
Main Authors: Chen, Y, Zhang, Y, Birch, D J S, Barnard, A S
Format: Article
Language:English
Subjects:
Alternative energy sources
Arrays
Aspect ratio
Gold
Luminescence
Nanoparticles
Nanorods
Nanostructure
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Summary: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 (
ISSN:2040-3364
2040-3372
DOI:10.1039/c2nr30324h