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Quenching of chlorophyll fluorescence induced by silver nanoparticles

Queiroz, AM and Mezacasa, AV and Graciano, DE and Falco, WF and M'Peko, JC and Guimarães, FEG and Lawson, T and Colbeck, I and Oliveira, SL and Caires, ARL (2016) 'Quenching of chlorophyll fluorescence induced by silver nanoparticles.' Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 168. 73 - 77. ISSN 1386-1425

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Abstract

© 2016 Elsevier B.V. All rights reserved. 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 Chl fluorescence intensity at 678 nm. The Stern-Volmer constant (KSV) showed that fluorescence suppression is driven by the dynamic quenching process. In particular, KSVwas 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.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 27 May 2016 13:59
Last Modified: 26 Jun 2018 18:15
URI: http://repository.essex.ac.uk/id/eprint/16825

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