Polychromatic fluorescent MoS2 quantum dots: fabrication and off-on sensing for fluorine ions in water

Feng-Yi Wu; Ji-Liang Yang; You-Sheng Ye; Ya-Qiong Kong; Rong Wu; Hai-Yan Wang; Xin Wang

doi:10.1039/d3ay00346a

Polychromatic fluorescent MoS₂ quantum dots: fabrication and off-on sensing for fluorine ions in water

Anal Methods. 2023 May 25;15(20):2490-2496. doi: 10.1039/d3ay00346a.

Authors

Feng-Yi Wu¹, Ji-Liang Yang¹, You-Sheng Ye¹, Ya-Qiong Kong¹, Rong Wu¹, Hai-Yan Wang¹, Xin Wang¹

Affiliation

¹ Water Environment Research Center, College of Chemistry and Material Engineering, Chaohu University, Hefei 238000, China. wfy@chu.edu.cn.

PMID: 37183653
DOI: 10.1039/d3ay00346a

Abstract

Recently, MoS₂ quantum dots (QDs) have receive widespread attention as a promising luminescent material. However, so far, little effort has been made on the multicolor emission of MoS₂ QDs. Herein, an in situ iodine doping strategy is presented and used to synthesize tunable-photoluminescent (PL) MoS₂ QDs. By fine iodine doping, the PL of the MoS₂ QDs (I-MoS₂ QDs) can be tuned in the range from 423 nm to 529 nm, which exceeds the as-reported emission wavelength range. Studies using controlled experiments and density functional theory (DFT) reveal that the change in electronic state of MoS₂ QDs is responsible for the changing PL due to iodine doping. As-synthesized I-MoS₂ QDs combined with Fe³⁺ is developed as a "turn-off-on" fluorescence sensor for F^- ions in water. The fluorescence probe has a fine linear response to F^- ions in the concentration range of 2.5-80 μM, and the limit of detection is 1.4 μM (S/N = 3).