By a News Reporter-Staff News Editor at Science Letter -- New research on Materials Science and Physical Chemistry is the subject of a report. According to news reporting from Lyon, France, by NewsRx journalists, research stated, "Light-matter interactions are of great interest for potential biological applications (bioimaging, biosensing, phototherapy). For such applications, sharp nanostructures exhibit interesting features since their extinction bands (surface plasmon resonance) cover a large bandwidth in the whole visible wavelength region due to the existence of 'hot spots'. located at the end of the tips."
The news correspondents obtained a quote from the research from the University of Lyon, "In this context, gold nanostars appear to be interesting objects. However, their study remains difficult, mainly due to complicated synthetic methods and further functionalization. This paper reports the synthesis, functionalization, and photophysics of luminescent hybrid gold nanostars prepared using a layer-by-layer (LbL) deposition method for the tuning of chromophore-to-particle distances together with the impact of the spectral overlap between the plasmon and the emission/absorption of the dyes. Several luminescent dyes with different optical signatures were selectively adsorbed at the nanoparticle surface. The optimized systems, exhibiting the highest luminescence recovery, clearly showed that overlap must be as low as possible. Also, the fluorescence intensities were quenched in close vicinity of the metal surface and revealed a distance-dependence with almost full recovery of the dyes emission for 11 LbL layers, which corresponded to 15 nm distances evaluated on dried samples."
According to the news reporters, the research concluded: "The photophysics of the luminescent core shell particles were carried out in suspension and correlated with the response of isolated single objects."
For more information on this research see: Tuning Dye-to-Particle Interactions toward Luminescent Gold Nanostars. Langmuir, 2013;29(34):10915-10921. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
Our news journalists report that additional information may be obtained by contacting J.R.G. Navarro, University of Lyon, Ecole Normale Super Lyon, CNRS, Lab Chim UMR 5182, F-69364 Lyon 07, France. Additional authors for this research include A. Liotta, A.C. Faure, F. Lerouge, F. Chaput, G. Micouin, P.L. Baldeck and S. Parola (see also Materials Science and Physical Chemistry).
Keywords for this news article include: Lyon, France, Europe, Phototherapy, Materials Science and Physical Chemistry
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