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0Does a custom-designed metasurface outperform a self-assembled nanoparticle array in chemiluminescence enhancement?
D.R. Dadadzanov1, N.B. Leonov1, N.S. Petrov1, A.V. Palekhova1, D.V. Kononov1, N.A. Virts1'2, A.S. Bukatin3,4, N.A. Filatov1,4, T.A. Vartanyan1*
1-IR&EC PhysNano, ITMO University, St. Petersburg, Russia 2- Novosibirsk State University, 630090 Novosibirsk, Russia 3- Institute for Analytical Instrumentation of the Russian Academy of Sciences, Saint-Petersburg, Russia
4- Alferov University, St. Petersburg, Russia
* Tigran.Vartanyan@mail.ru
Chemiluminescence (CL) detection is an analytical method characterized by high sensitivity, wide linear range, easy operation, and simple instruments. Despite these advantages, CL of diluted and limited in volume analytes is weak and needs amplification. We attacked this problem with a promising approach akin to metal-enhanced fluorescence. Metal-enhanced chemiluminescence has already been demonstrated in several studies [1,2]. The idea behind this method is based on the notion that the radiative transition yield of the excited state formed as a result of photochemical reaction is low due to unfavorable competition with non-radiative transitions that occur much faster than the radiative transitions do. Thus, the natural way to enhance CL intensity is to speed up the radiative transitions via coupling of chemiluminescent species to a faster radiator. According to previous studies [3-5] localized surface plasmons in metal nanoparticles may serve for this purpose very well, although there remain doubts about the role played by the concurrent catalytic processes induced on metal surfaces.
Fig. 1. The photo on the left panel shows a microfluidic chip comprising 7 individual channels with self-organized granular silver films deposited at their bottoms. The graphs on the right panel prove the considerable overlap between the CL spectrum of luminol and the plasmon band of silver nanoparticles survived all steps of the microfluidic chip preparation.
We are developing a microfluidic platform for well-controlled mixing of chemiluminescent species like luminol and lucigenin with oxidizes like hydrogen peroxide and other reactive oxygen species in the presence of metal nanoparticles possessing localized surface plasmon resonance. Silver nanoparticles arrays are arranged on the bottoms of the microfluidic channels in such a way that CL takes place under the influence of nearby silver nanoparticles. Both self-organized nanoparticle arrays fabricated via physical vapor deposition and specially designed periodic arrays of identical cylindrical nanoparticles are considered and compared for their efficiency as CL enhancer.
This study was supported by grant No. 23-72-00045 from the Russian Science Foundation, https://rscf.ru/proj ect/23-72-00045/.
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[4] N.A. Virts, D.R. Dadadzhanov, A.S. Yablokov, D.V. Shershnev, T.A. Vartanyan, Chemiluminescent hydrogen peroxide sensor based on luminol and a colloidal solution of metal nanoparticles, Opt. and Spectr., vol. 131, pp. 1531-1534 (2023).
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