Electrodynamic Contribution to Chemiluminescence Enhancement by Metallic Nanoparticles
Gleb R. Simonenko1, Igor Yu. Nikitin1, Lubov N. Borodina1, Nikita S Petrov1, Alena V. Palekhova1, Danila V. Kononov1, Daler R. Dadadzanov1, Nikita B. Leonov1, Anton S. Bukatin2,3, N.A. Filatov1,3, Sargis Pinamyan4, Andrey V. Veniaminov1, Tigran A. Vartanyan1; 1IR&EC PhysNano, ITMO University, St. Petersburg, Russia; 2Institute for Analytical Instrumentation of the Russian Academy of Sciences, Saint-Petersburg, Russia; 3Alferov University, St. Petersburg, Russia; 4ZAO “Geokosmos”, Erevan, Armenia
Abstract
Metal-enhanced chemiluminescence is the most suspicious member of the large family of plasmon-related processes that includes surface-enhanced Raman scattering, metal-enhanced absorption, metal-enhanced photo-luminescence, plasmon-enhanced photodesorption and plasmon-enhanced photoconductivity. Suspicion is raised by the fact that metal nanoparticles are capable of catalyzing the formation of free radicals, including reactive oxygen species, the registration of which in the absence of any disturbing factors is the main purpose of using chemiluminescent methods. From this point of view, an increase of the chemiluminescence intensity in the presence of metal nanoparticles observed by many researches does not necessary leads to the development of useful analytical instrument. Various approaches have been used to dispel doubts. In particular, it has been shown that enhancement is reduced when metal nanostructures are coated with impermeable shells or simply do not have a plasmon resonance in the spectral range of the chemiluminophore emission band. Nevertheless, as the enhancement does not disappear in these cases the question arises about relative contributions of chemical and electrodynamic effects in the metal-enhanced chemiluminescence. Our approach is based on the simple argument supported by numerical modeling that in the case of the electrodynamic mechanism of enhancement the spectrum of chemiluminescence should change simultaneously with the chemiluminescence intensity. This opens the way for quantitative separation of the electrodynamic contribution from the chemical effect on the concentration of reactive oxygen species.
Speaker
Tigran Vartanyan
ITMO University
Russia
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