Tunable fluorescent amino-functionalized Ti₃C₂T_x MXene quantum dots for ultrasensitive Fe³⁺ ion sensing

Abstract

Development of sensors with highly sensitivity, good selectivity and reproducibility are of great importance for the detection of Fe3+ in water contamination for environmental monitoring. In this work, the reflux...

Covalent Bonding of MXene/Reduced Graphene Oxide Composites for Efficient Electromagnetic Wave Absorption

“…37 There are distinctive peaks at 560 cm −1 (Ti−O deformation vibration), 1630 cm −1 (C�C stretching), 2850 and 2920 cm −1 (C−H stretching), and 3430 cm −1 (O−H and N−H stretching) when responding in various ratios. 38,39 It is important to note that the peak at 1630 cm −1 is divided into two smaller peaks at 1640 and 1580 cm −1 , which stand for the stretching vibrations of amide's C�C and C�O, respectively. 40 Additionally, the absorption peak occurs in MG while the tensile peak at 1730 cm −1 in rGO nearly completely vanishes.…”

Trends in Using Fluorescent MXene Quantum Dots for Selective Detection and Bioimaging Applications: A Review

“…Strong interaction and redox reactions were proposed for the alteration of QDs’ fluorescence properties due to the high positive charge and strong oxidation potentiality. Wang et al and Al-Duais et al also recognized Fe 3+ ions and proposed ground-state complex formation among Fe 3+ and QDs. , …”

Review of MXene-Derived Quantum Dots for Cancer Theranostics

“…The GSH could prevent the oxidation of Ti 3 C 2 QDs and improve the stability of luminescence, leading to the better stability of ECL in GSH-MQDs (Figure 9e). Furthermore, the different molar ratios of GSH and MAX were also explored to achieve optimal performance, and the maximum ECL was realized at the 67 and amino, 74 which showed a similar enhancement of performance.…”

“…The sulfhydryl group of GSH could interact with the metal atoms on the Ti 3 C 2 QDs, reducing the defects of Ti 3 C 2 QDs and improving luminescence performance of Ti 3 C 2 QDs. Moreover, the 2D-MQDs capped by other groups also have been investigated, such as the uric acid and amino, which showed a similar enhancement of performance.…”

“…The stability and defects of Ti 3 C 2 QDs were improved due to the existence of GSH, which was beneficial to improve the luminescence performance of Ti 3 C 2 QDs. Moreover, many other efficient methods employing external energy have also realized the successful preparation of 2D-MQDs, such as synthesized by the molten inorganic salts (Figure g,h), ultrafast shaped laser (Figure a), acoustomicrofluidic (Figure b), microexplosion (Figure c,d), TMAOH refluxed, , combustion method, and so on. , All methods could obtain satisfactory 2D-MQDs, and the different methods would result in the difference in sizes, terminals, and structures, exhibiting diverse catalytic activities for various applications. The above-mentioned top-down methods can effectively prepare most 2D-MQDs with original structure, but there are also some disadvantages, such as the still relatively low yield, long time-consuming, and uncontrollable morphology.…”