Issue 16, 2022

Light-emitting Ti2N (MXene) quantum dots: synthesis, characterization and theoretical calculations

Abstract

MXene-based quantum dots (MQDs), which are obtained by fragmenting MXenes into a nanometer scale, can display photoluminescence (PL), suggesting light-emitting applications for bandgap-less MXenes. However, despite the diverse possible formations of MXene components, only carbide MXene-based MQDs have been reported to emit light. In this study, we synthesized water-soluble MQDs with an average diameter of 3.14 nm using the titanium nitride (Ti2N) MXene. Ti2N MQDs exhibited efficient PL, with a maximum quantum yield of 7.5%, upon light absorption over the deep UV wavelength range of 400–230 nm. The density functional theory calculations and PL excitation measurements identified a bandgap of 3.8 eV and the existence of an unfulfilled band (E1) between the occupied low-energy (E0) and unoccupied high-energy (E2) bands, which induces strong absorption in deep UV energy originating from the E0–E2 transition. Light-emitting nitride MQDs expand and facilitate the UV optoelectronic applications of MQDs.

Graphical abstract: Light-emitting Ti2N (MXene) quantum dots: synthesis, characterization and theoretical calculations

Supplementary files

Article information

Article type
Paper
Submitted
10 фев 2022
Accepted
25 мар 2022
First published
30 мар 2022

J. Mater. Chem. C, 2022,10, 6508-6514

Light-emitting Ti2N (MXene) quantum dots: synthesis, characterization and theoretical calculations

A. S. Sharbirin, S. Roy, T. T. Tran, S. Akhtar, J. Singh, D. L. Duong and J. Kim, J. Mater. Chem. C, 2022, 10, 6508 DOI: 10.1039/D2TC00568A

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