Journal article

Silver Nanoparticle Gradient Arrays: Fluorescence Enhancement of Organic Dyes

Julian Sindram, Kirsten Volk, Paul Mulvaney, Matthias Karg



Noble metal nanoparticles show pronounced extinction peaks in the visible wavelength range due to their localized surface plasmon resonances. The excitation of these resonances leads to strong confinement of electromagnetic energy at nanometer scales, which is critical for ultrasensitive, fluorescence-based detection of analytes. The strength and spatial distribution of this near-field zone depend on particle size, shape, and composition. To determine how these near-field effects depend on the particle size, we have prepared nanoparticle gradients on centimeter-scale substrates using a colloid-based approach. This plasmonic gradient is used to study the steady-state emission and fluorescence..

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University of Melbourne Researchers


Awarded by German Research Foundation (DFG) through the Emmy Noether programme

Awarded by ARC

Funding Acknowledgements

The authors acknowledge financial support by the German Academic Exchange service (DAAD) through its Thematic Network Melbourne-Bayreuth Polymer/Colloid Network sponsored from funds of the Federal Ministry of Education and Research (BMBF). M.K. and J.S. want to acknowledge the German Research Foundation (DFG) for funding through the Emmy Noether programme under grant KA3880/1-1. P.M. thanks the ARC for support through CE170100026.