Abstract
Engineering the spectral properties of fluorophores, such as the enhancement of luminescence intensity, can be achieved through coupling with surface plasmons in metallic nanostructures1,2,3,4,5,6,7,8,9,10,11. This process, referred to as metal-enhanced fluorescence, offers promise for a range of applications, including LEDs, sensor technology, microarrays and single-molecule studies. It becomes even more appealing when applied to colloidal semiconductor nanocrystals, which exhibit size-dependent optical properties, have high photochemical stability, and are characterized by broad excitation spectra and narrow emission bands12. Other approaches have relied upon the coupling of fluorophores (typically organic dyes) to random distributions of metallic nanoparticles or nanoscale roughness in metallic films1,2,3,4,6,8. Here, we develop a new strategy based on the highly reproducible fabrication of ordered arrays of gold nanostructures coupled to CdSe/ZnS nanocrystals dispersed in a polymer blend. We demonstrate the possibility of obtaining precise control and a high spatial selectivity of the fluorescence enhancement process.
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Change history
03 September 2014
In the online versions of this Letter originally published, the resolution of the images in Figs 1a and 4b–f was lower than as supplied by the authors; the images have now been replaced with the higher-resolution ones.
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Acknowledgements
The authors gratefully acknowledge help from L. Carbone and L. L. del Mercato in the synthesis of NCs and for AFM characterizations, and the expert technical assistance of E. D'Amone and G. Epifani. This work was partially supported by the Italian Ministry of Research through MIUR “FIRB” project (RBLA03ER38_001). P.P.P. and L.M. would also like to thank the AAs association for fruitful discussions.
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Pompa, P., Martiradonna, L., Torre, A. et al. Metal-enhanced fluorescence of colloidal nanocrystals with nanoscale control. Nature Nanotech 1, 126–130 (2006). https://doi.org/10.1038/nnano.2006.93
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DOI: https://doi.org/10.1038/nnano.2006.93
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