Journal article
Distance and wavelength dependent quenching of molecular fluorescence by Au@SiO2 core-shell nanoparticles
P Reineck, D Gómez, SH Ng, M Karg, T Bell, P Mulvaney, U Bach
ACS Nano | AMER CHEMICAL SOC | Published : 2013
DOI: 10.1021/nn401775e
Abstract
Gold nanoparticles and nearby fluorophores interact via electromagnetic coupling upon light excitation. We determine the distance and wavelength dependence of this coupling theoretically and experimentally via steady-state and time-resolved fluorescence spectroscopy. For the first time, the fluorescence quenching of four different dye molecules, which absorb light at different wavelengths across the visible spectrum and into the near-infrared, is studied using a rigid silica shell as a spacer. A comprehensive experimental determination of the distance dependence from complete quenching to no coupling is carried out by a systematic variation of the silica shell thickness. Electrodynamic theor..
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Funding Acknowledgements
The authors would like to acknowledge the ARC for providing equipment (LE0883019) and fellowship (DP110105312) support. This work was further supported by the Australian Solar Institute, the Victorian State Government (DBI-VSA and DPI-ETIS) and Monash University as well as the Commonwealth Scientific and Industrial Research Organization through an OCE Science Leader position. This work was performed in part at the Melbourne Centre for Nanofabrication, an initiative partly funded by the Commonwealth of Australia and the Victorian Government. D.G. would like to acknowledge the ARC for support through DP110101767. The authors thank A. Funston for valuable discussions and B. Greystone for assistance with the time correlated single photon counting measurements. The authors acknowledge use of facilities and the assistance of E. Lavoie and L. Bourgeois within the Monash Centre for Electron Microscopy.