International Conference Physics.SPb/2023 October 23-27, 2023, St. Petersburg
Nanophotonics

Mechanisms of quenching of photoluminescence of carbon dots by metal cations

A. M. Vervald^a, G. N. Chugreeva^a, K. A. Laptinskiy^a, I. I. Vlasov^b, T. A. Dolenko<sup>a

a</sup> Lomonosov Moscow State University, Moscow, Russia
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia

Abstract: The sensitivity of photoluminescence of carbon dots (CDs) to the presence of ions in the environment opens up prospects for creating optical nanosensors for heavy metal cations based on CDs, which requires knowledge of the mechanisms of the influence of ions on the photoluminescence characteristics of these nanoparticles. In this paper, for the CDs of hydrothermal synthesis the mechanisms of the quenching of their photoluminescence by five metal cations: Fe$^{3+}$, Cr$^{3+}$, Co$^{2+}$, Pb$^{2+}$, Mg$^{2+}$, were determined. It was found that for all ions a dynamic mechanism of quenching of photoluminescence of CDs makes a great contribution.

Keywords: photoluminescence, carbon dots, metal ions, quenching mechanisms, nanosensor.

Received: 12.05.2023
Revised: 21.07.2023
Accepted: 30.10.2023

DOI: 10.61011/OS.2023.11.57015.5122-23

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