High quantum-yield luminescent MoS₂ quantum dots with variable light emission created via direct ultrasonic exfoliation of MoS₂ nanosheets

Abstract

MoS2 QDs with high quantum-yield, variable photoluminescence emission properties and good biocompatibility are studied and applied to the bio-imaging field.

pH Dependent Optical Switching and Fluorescence Modulation of Molybdenum Sulfide Quantum Dots

“…We found QY ≈ 2.54% under pH ≈7, which is improved up to ≈2.78% for under basic conditions (pH ≈ 13). However, there are literatures which have shown that it could be increased up to ≈4.84% under sonication with ion intercalation method for alkaline medium …”

Graphene and graphene-like two-denominational materials based fluorescence resonance energy transfer (FRET) assays for biological applications

“…The QY of MoS 2 quantum dots is reported from 2.6% to 4.84% (Wu et al, 2015;Wang and Ni, 2014) and the QY of WS 2 quantum dots is reported from 1.8% to 4% Yan et al, 2016). The MoS 2 and WS 2 quantum dots also shows excitation-dependent emission.…”

“…The MoS 2 and WS 2 quantum dots also shows excitation-dependent emission. The fluorescence emission spectra of MoS 2 QDs can be modulated from blue, green to red (Wu et al, 2015) and the fluorescence of WS 2 quantum dots was mainly at the blue to green light region under various excitation wavelength .…”

“…A linear detection range from 0.5 to 60 ng mL -1 was achieved with a limit of detection of 0.2 ng mL -1 for PSA detection. Jia et al used aptamer loaded MoS 2 nanoplates as nanoprobes for intracellular ATP detection and photodynamic therapy (PDT) via ATP-mediated controllable release of singlet oxygen(Jia et al, 2015).MoS 2 quantum dots are emerging 2D nanomaterial photoluminescent probes which have been synthesized with strong photoluminescence, high quantum yield and good biocompatibility(Dai et al, 2015;Wang et al, 2014;Wu et al, 2015).Wang et al. used MoS 2 QDs as photoluminescent probes to construct a photoluminescence (PL) quenching sensor for detection of 2,4,6-trinitrophenol (TNP).…”

Quantum dots from microfluidics for nanomedical application

“…In order to obtain TMD QDs, the X‐M‐X bond in the plane needs to be broken and then generate edge atoms. Because of the weak van der Waals force between TMD layers, TMD QDs can be easily obtained by ultrasonic grinding or solvent heat treatment (Gan et al, ; Gao, Wang, Ran, & Li, ; Gopalakrishnan et al, ; Gopalakrishnan, Damien, & Shaijumon, ; Ha, Han, Choi, Park, & Seo, ; Li et al, ; Lin et al, ; Lin et al, ; Qiao et al, ; Ren et al, ; Štengl, Tolasz, & Popelková, ; Wu, Zhang, Ma, Qiu, & Zhang, ; Xu, Li, & Wu, ; Yong et al, ; Yuwen et al, ). Zhang et al () prepared many TMD QDs (MoS 2 , WS 2 , ReS 2 , TaS 2 , MoSe 2 , and WSe 2 ) from the corresponding bulk TMD crystals at room temperature by combining the grinding and ultrasonic processes.…”