Effect of Transition Metals on the Fluorescence Excitation-Emission Matrices of Carbon Dots
and Their Fractions in water
Matvey S. Kulikov1, Kirill A. Laptinsky1,2, Tatyana A. Dolenko1; 1Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia; 2D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
Abstract
The development of highly sensitive and easily reproducible optical sensors remains one of the key challenges in modern physics. Carbon dots (CDs) are the solution to this problem due to their photoluminescent properties, in particular, the special sensitivity of fluorescence to environmental parameters. However, the practical application of CDs is often limited by an insufficient understanding of the mechanisms of their interaction with the environment, particularly regarding the selective recognition of cations and anions.
This study fills this gap by systematically studying the interaction of synthesized carbon dots with various metal salts To isolate the influence of cations and anions on the fluorescence of CDs in water, the optical properties of CDs were studied in aqueous solutions of nitrates, sulfates and chlorides of three cations (Cu2+, Ni2+, Co2+) – in a total of nine aqueous solutions of salts. This approach allowed us to confirm that the observed optical response is primarily due to interactions with cations rather than anions.
Since hydrothermal synthesis CDs are not homogeneous in their properties but rather represent a collection of fractions with distinct properties, horizontal gel electrophoresis was used to isolate the fractions most sensitive to the target ions. It was shown that the isolated fractions differ in their fluorescence sensitivity to the target ions. Analysis of the obtained fluorescence excitation-emission matrices of the CDs fractions allowed us to formulate hypotheses regarding the mechanisms of CDs fluorescence changes in the presence of the target ions, bringing us closer to the creation of a fully-fledged ion sensor based on carbon dots.
The study was supported by the grant from the Russian Science Foundation No. 22-12-00138-P,
https://rscf.ru/en/project/22-12-00138/.
Speaker
Kulikov Matvey Sergeevich
Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
Russia
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