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- In relation to this article, we declare that there is no conflict of interest.
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Received October 23, 2023
Accepted February 27, 2024
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Synthesis of a Fluorescent Sensor by Exploiting Nitrogen-Doped MXene Quantum Dots for the Detection of Dopamine
Abstract
MXene quantum dots (QDs) are emerging two-dimensional materials from the MXene family that possess unique physicochemical
properties and are employed in divergent disciplines, such as energy storage, conversion, catalysis, medicine,
and biosensing. In this study, we synthesized MXene QDs using the MAX phase of MXene into its sheets by acidic treatment,
followed by doping with ethylenediamine (EDA), and produced nitrogen-doped QDs (NMQDs) via the hydrothermal
method. The resulting NMQDs showed excellent fl uorescence quenching with a neurotransmitter, i.e., dopamine (DA). These
NMQDs showed a strong blue fl uorescence with a photoluminescence (PL) emission wavelength maximum of 400 nm under
the excitation wavelength maximum of 330 nm. The optical properties of NMQDs were investigated using UV–Vis and PL
spectroscopy techniques. The morphological, elemental constitution, and phase composition features were characterized
by employing HRTEM, SEM, XPS, XRD, FTIR techniques, etc. The NMQDs delivered high sensitivity towards DA with a
limit of detection (LOD) of 18 nM within the linear concentration range between 20 and 100 nM. These results suggest that
these NMQDs have the potential to be used as fl uorescent sensors for neurotransmitter detection.
