Queiroz, AM and Mezacasa, AV and Graciano, DE and Falco, WF and M'Peko, J-C 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. pp. 73-77. DOI https://doi.org/10.1016/j.saa.2016.05.033
Queiroz, AM and Mezacasa, AV and Graciano, DE and Falco, WF and M'Peko, J-C 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. pp. 73-77. DOI https://doi.org/10.1016/j.saa.2016.05.033
Queiroz, AM and Mezacasa, AV and Graciano, DE and Falco, WF and M'Peko, J-C 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. pp. 73-77. DOI https://doi.org/10.1016/j.saa.2016.05.033
Abstract
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, KSV 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.
Item Type: | Article |
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Uncontrolled Keywords: | Chlorophyll; Fluorescence; Lifetime; Quenching; Silver; Nanoparticle |
Subjects: | Q Science > QH Natural history > QH301 Biology |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 27 May 2016 13:59 |
Last Modified: | 30 Oct 2024 19:59 |
URI: | http://repository.essex.ac.uk/id/eprint/16825 |
Available files
Filename: Manuscript - AgNPs-Chl - Final.pdf