Optical Properties of Micro-patterned Silver Nanoparticle Substrates |
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Authors: | Ondrej Stranik Daniela Iacopino Robert Nooney Colette McDonagh and Brian D MacCraith |
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Institution: | (1) Biomedical Diagnostics Institute, School of Physical Sciences, Dublin City University, Glasnevin, Dublin, 9, Ireland;(2) Nanotechnology Group, Tyndall Institute, Lee Maltings, University College, Cork, Ireland; |
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Abstract: | In this paper, we describe a novel technique for depositing metal nanoparticles (NPs) on a planar substrate whereby the NPs
are micro-patterned on the surface by a simple stamp-printing procedure. The method exploits the attractive force between
negatively charged colloidal metal NPs and positively-charged polyelectrolyte layers which have been selectively deposited
on the surface. Using this technique, large uniform areas of patterned metal NPs, with different plasmonic properties, were
achieved by optimisation of the stamping process. We report the observation of unusual fluorescence emission from these structures.
The emission was measured using epifluorescence microscopy. Fluorescence lifetime behaviour was also measured. Furthermore,
the μ-patterned NPs exhibited blinking behaviour under 469 nm excitation and the fluorescence spectrum was multi-peaked. It
has been established that the fluorescence is independent of the plasmon resonance properties of the NPs. As well as optimising
the novel NP μ-patterning technique, this work discusses the origin and characteristics of the anomalous fluorescence behaviour
in order to characterise and minimise this unwanted background contribution in the use of metal NPs for plasmonic enhancement
of fluorescence for optical biochip applications. |
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