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

Abstract

Recently, MoS2 quantum dots (QDs) have receive widespread attentions as a promising luminescent material. However, so far, few efforts have been made on the multicolor emission of MoS2 QDs. Herein,...

Hydrothermal Synthesis of Fluorescent Functionalized MoS2 Quantum Dots for Heavy Metal Detection

“…The formation of a coordination complex between MoS 2 QDs and the metal is a feasible mechanism for PL quenching. The literature reports that electrons pairs of functional surface groups, such as −CN and −NH, can promote the complex formation between MoS 2 QDs and Fe 3+ . Moreover, the contribution of dynamic quenching, which is related to the time-resolved lifetime PL, together with inner filter effect (IFE) is also reported in some cases, and the total quenching may result from multiple quenching mechanism contributions …”

“…The literature reports that electrons pairs of functional surface groups, such as −CN and −NH, can promote the complex formation between MoS 2 QDs and Fe 3+ . 32 Moreover, the contribution of dynamic quenching, which is related to the time-resolved lifetime PL, together with inner filter effect (IFE) is also reported in some cases, and the total quenching may result from multiple quenching mechanism contributions. 33 Herein, we propose that the interaction between the Cu 2+ ions and the QDs takes place at multiple active sites, as illustrated in Figure 4.…”

“…In this direction, Wu et al 32 employed tetrathiomolybdate and cystamine in the presence of potassium iodide (KI) using a hydrothermal method to obtain I-MoS 2 QDs, which are promising for Fe 3+ detection. 32 It was shown that the increment of iodine led to a red-shift emission from blue to green. The synthesis of QDs employing ultrasonic exfoliation of bulk MoS 2 can also lead to the surface functionalization of MoS 2 QDs by introducing sulfate bonds.…”

“…The surface functionalization of MoS 2 QDs offers a suitable strategy for sensing applications, facilitating tailored chemical interactions to target specific analytes, and enhancing sensitivity and specificity. In this direction, Wu et al 32 employed tetrathiomolybdate and cystamine in the presence of potassium iodide (KI) using a hydrothermal method to obtain I-MoS 2 QDs, which are promising for Fe 3+ detection. 32 It was shown that the increment of iodine led to a red-shift emission from blue to green.…”

Chlorine-doped MoS2 quantum dots embedded in a molecularly imprinted polymer for highly selective and sensitive optosensing of quercetin

“…9 Among them, the fluorescence spectrometry method is considered as a powerful tool for quercetin detection due to its low cost, simplicity and high efficiency and sensitivity. 10 Most of the analysis methods are based on organic dye fluorescent probes. Due to the low photostability of organic dyes, the detection results often suffer from false positives and sensitivity problems.…”