Nanoscale control of Ag nanostructures for plasmonic fluorescence enhancement of near-infrared dyes

Xie, F., Pang, J. S., Centeno, A. , Ryan, M. P., Riley, D. J. and Alford, N. M. (2013) Nanoscale control of Ag nanostructures for plasmonic fluorescence enhancement of near-infrared dyes. Nano Research, 6, pp. 496-510. (doi: 10.1007/s12274-013-0327-5)

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Potential utilization of proteins for early detection and diagnosis of various diseases has drawn considerable interest in the development of protein-based detection techniques. Metal induced fluorescence enhancement offers the possibility of increasing the sensitivity of protein detection in clinical applications. We report the use of tunable plasmonic silver nanostructures for the fluorescence enhancement of a near-infrared (NIR) dye (Alexa Fluor 790). Extensive fluorescence enhancement of ∼2 orders of magnitude is obtained by the nanoscale control of the Ag nanostructure dimensions and interparticle distance. These Ag nanostructures also enhanced fluorescence from a dye with very high quantum yield (7.8 fold for Alexa Fluor 488, quantum efficiency (Qy) = 0.92). A combination of greatly enhanced excitation and an increased radiative decay rate, leading to an associated enhancement of the quantum efficiency leads to the large enhancement. These results show the potential of Ag nanostructures as metal induced fluorescence enhancement (MIFE) substrates for dyes in the NIR “biological window” as well as the visible region. Ag nanostructured arrays fabricated by colloidal lithography thus show great potential for NIR dye-based biosensing applications.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Centeno, Dr Anthony
Authors: Xie, F., Pang, J. S., Centeno, A., Ryan, M. P., Riley, D. J., and Alford, N. M.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Nano Research
Publisher:Springer Verlag
ISSN (Online):1998-0000
Published Online:23 May 2013
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