Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 168, Issue -, Pages 73-77Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2016.05.033
Keywords
Chlorophyll; Fluorescence; Lifetime; Quenching; Silver; Nanoparticle
Categories
Funding
- CNPq
- CAPES
- FUNDECT
- National Institute of Science and Technology of Optics and Photonics (INOF)
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The interaction between chlorophyll (Chl) and silver nanoparticles (AgNPs) was evaluated by analyzing the optical behavior of Chl molecules surrounded by different concentrations of AgNPs (10, 60, and 100 nm of diameter). UV-Vis absorption, steady state and time-resolved fluorescence measurements were performed for Chl in the presence and absence of these nanoparticles. AgNPs strongly suppressed the Chi fluorescence intensity at 678 nm. The Stern-Volmer constant (k(sv)) showed that fluorescence suppression is driven by the dynamic quenching process. In particular, k(sv) was nanoparticle size-dependent with an exponential decrease as a function of the nanoparticle diameter. Finally, changes in the Chl fluorescence lifetime in the presence of nanoparticles demonstrated that the fluorescence quenching may be induced by the excited electron transfer from the Chl molecules to the metal nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.
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