4.5 Article

Photoluminescence and X-Ray Excited Luminescence from Glutathione-Stabilized Gold Nanoparticles

Journal

JOURNAL OF BIOMEDICAL NANOTECHNOLOGY
Volume 9, Issue 11, Pages 1827-1836

Publisher

AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jbn.2013.1688

Keywords

Fluorescence; Gold Nanoclusters; Glutathione; Decay Lifetime; X-Ray Excited Luminescence; Cell Imaging

Funding

  1. UTA
  2. DHS joint ART program [2011-DN-077-ARI053-02, CBET-1039068]
  3. DOD [DTRA08-005]
  4. U.S. Army Medical Research Acquisition Activity (USAMRAA) [W81XWH-10-1-0279, W81XWH-10-1-0234]
  5. National Natural Science Foundation of China [81072596]
  6. program for New Century Excellent Talents in University [NCET-08-0226]
  7. China Scholarship Council [2011616067]
  8. NSERC
  9. NRC of Canada
  10. CIHR
  11. Province of Saskatchewan, Western Economic Diversification Canada
  12. University of Saskatchewan
  13. NSF

Ask authors/readers for more resources

Au nanoparticles coated with glutathione (GSH) were prepared by the heat-assisted reduction of Au(I)-thiol complex at 1:1 or 5:4 molar ratio of Au to GSH. The 1:1 sample has three emissions at 610, 645 and 800 nm while the 5:4 sample has a dominant emission at 800 nm but the two emissions at 610 and 645 nm are very weak. It was found in separations that the 610 and 645 nm emissions are closely related while the 800 nm emission behaves in a different way. By adding NaOH, the 800 nnn emission decreases while the red emission increases in intensity at low concentration, but both the red and the NIRL emissions are quenched at high concentrations. The luminescence lifetimes of the red emissions were on the nanosecond time scale while the 800 nm emission was on the microsecond time scale. Based on these observations, it is concluded that the red emission is from a single excited states while the 800 nm emission is originated from surface states. Also, for the first time, X-ray excited luminescence is reported here from Au nanoparticles and the applications of these nanoparticles for cell imaging is also investigated.

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