Nitrogen-Doped Carbon Nanodots Produced by Femtosecond Laser Synthesis for Effective Fluorophores.

Autor:	Astafiev AA; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation.; Chemistry Department, Moscow State University, 119991 Moscow, Russian Federation., Shakhov AM; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation.; Chemistry Department, Moscow State University, 119991 Moscow, Russian Federation., Tskhovrebov AG; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation.; Research Institute of Chemistry, People's Friendship University of Russia, 117198 Moscow, Russian Federation., Shatov A; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation., Gulin A; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation., Shepel D; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation., Nadtochenko VA; Bio&Nanophotonics Lab, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation.; Chemistry Department, Moscow State University, 119991 Moscow, Russian Federation.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2022 Feb 17; Vol. 7 (8), pp. 6810-6823. Date of Electronic Publication: 2022 Feb 17 (Print Publication: 2022).
DOI:	10.1021/acsomega.1c06413
Abstrakt:	Understanding the effect of heteroatom doping is crucial for the design of carbon nanodots (CNDs) with enhanced luminescent properties for fluorescence imaging and light-emitting devices. Here, we study the effect and mechanisms of luminescence enhancement through nitrogen doping in nanodots synthesized by the bottom-up route in an intense femtosecond laser field using the comparative analysis of CNDs obtained from benzene and pyridine. We demonstrate that laser irradiation of aromatic compounds produces hybrid nanoparticles consisting of a nanocrystalline core with a shell of surface-bonded aromatic rings. These nanoparticles exhibit excitation-dependent visible photoluminescence typical for CNDs. Incorporation of nitrogen into pyridine-derived CNDs enhances their luminescence characteristics through the formation of small pyridine-based fluorophores peripherally bonded to the nanoparticles. We identify oxidation of surface pyridine rings as a mechanism of formation of several distinct blue- and green-emitting fluorophores in nanodots, containing pyridine moieties. These findings shed additional light on the nature and formation mechanism of effective fluorophores in nitrogen-doped carbon nanodots produced by the bottom-up route. Competing Interests: The authors declare no competing financial interest. (© 2022 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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