Fabrication of blue luminescent MoS 2 quantum dots by wet grinding assisted co-solvent sonication

Ali, J.; Siddiqui, Ghayas Uddin; Choi, Kyung Hyun; Jang, Yunseok; Lee, Kangtaek

doi:10.1016/j.jlumin.2015.09.028

Cited by 64 publications

(37 citation statements)

References 45 publications

(59 reference statements)

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“…Raman spectra of MoS 2 QDs are shown in Figure A. Experimental results of Raman spectra revealed two phonon modes (

{normalE}_{2 g}^{1}

and A 1g ) located at 380 and 402 cm −1 , respectively, for both MoS 2 pristine and MoS 2 QDs, where

{normalE}_{2 g}^{1}

mode is associated with the opposite vibration of two sulfur atoms with respect to the molybdenum atom, and A 1g mode is related to the out‐of‐plane vibration of sulfur atoms in the opposite direction . An energy‐dispersive X‐ray (EDX) analysis was also performed to determine the elemental composition of as‐prepared MoS 2 QDs (Figure B).…”

Section: Resultsmentioning

confidence: 99%

Chiral MoS₂ Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Ahmed

Neethirajan

2018

Global Challenges

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Molybdenum disulfide (MoS 2 ), a type of transition metal dichalcogenide material, has emerged as an important class among 2D systems. When 2D MoS 2 materials are reduced to 0D quantum dots (QDs), they introduce new optical properties that point to several potential technological advantages in electronic, magnetic, optical, and catalytic properties. In this study, a simple way to produce chiral MoS 2 QDs from MoS 2 nanopowder is presented using l (+)‐ascorbic acid as a reducing agent. The calculated quantum yield of QDs is 11.06%. Experimental results reveal that the size of QDs is uniformly monodispersed (2–3 nm) and have a blue emissive fluorescence peak and circular dichroism (CD) peak located at 420 and 330 nm, respectively. Furthermore, a dual‐mode detection system based on fluorescence and chirality is performed using as‐synthesized MoS 2 QDs, where QDs are conjugated with anti‐hemagglutinin antibodies of avian influenza virus and made into an immunobridge in the presence of target virus and anti‐neuraminidase antibodies conjugated magnetic nanoparticles (MNPs). The photoluminescence and CD spectra of unconjugated QDs after separated magnetochirofluorescent (MNPs‐QDs) nanohybrids by external magnets enables influenza virus A (H5N1) detection with the limit of detection value of 7.35 and 80.92 pg mL −1 , respectively.

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“…Raman spectra of MoS 2 QDs are shown in Figure A. Experimental results of Raman spectra revealed two phonon modes (

{normalE}_{2 g}^{1}

and A 1g ) located at 380 and 402 cm −1 , respectively, for both MoS 2 pristine and MoS 2 QDs, where

{normalE}_{2 g}^{1}

Section: Resultsmentioning

confidence: 99%

Chiral MoS₂ Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Ahmed

Neethirajan

2018

Global Challenges

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“…Grinding of pristine MoS 2 powder in NMP was carried out for 1 hour in a mortar followed by heating at 100 °C for 1 hour to evaporate the solvent. Furthermore ground MoS 2 was dispersed in NMP for probe sonication for 1 hour as grinding and sonication both are effective in exfoliation of MoS 2 flakes42. Finally centrifugation at 6000 rpm was carried out for 30 min to remove the larger nanoplatelets and partially exfoliated crystallites.…”

Section: Methodsmentioning

confidence: 99%

Resistive Switching in All-Printed, Flexible and Hybrid MoS2-PVA Nanocomposite based Memristive Device Fabricated by Reverse Offset

Rehman

Siddiqui

Gul

et al. 2016

Sci Rep

Self Cite

133

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Owing to the increasing interest in the nonvolatile memory devices, resistive switching based on hybrid nanocomposite of a 2D material, molybdenum disulphide (MoS2) and polyvinyl alcohol (PVA) is explored in this work. As a proof of concept, we have demonstrated the fabrication of a memory device with the configuration of PET/Ag/MoS2-PVA/Ag via an all printed, hybrid, and state of the art fabrication approach. Bottom Ag electrodes, active layer of hybrid MoS2-PVA nanocomposite and top Ag electrode are deposited by reverse offset, electrohydrodynamic (EHD) atomization and electrohydrodynamic (EHD) patterning respectively. The fabricated device displayed characteristic bistable, nonvolatile and rewritable resistive switching behavior at a low operating voltage. A decent off/on ratio, high retention time, and large endurance of 1.28 × 102, 105 sec and 1000 voltage sweeps were recorded respectively. Double logarithmic curve satisfy the trap controlled space charge limited current (TCSCLC) model in high resistance state (HRS) and ohmic model in low resistance state (LRS). Bendability test at various bending diameters (50-2 mm) for 1500 cycles was carried out to show the mechanical robustness of fabricated device.

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“…[32][33][34] Especially, MoS 2 (QDs) has been recognized as a prospective candidate due to its high stability, low toxicity, abundance and suitable optical properties. [35] MoS 2 QDs convince both large edge-to-volume ratio and high in-plane electron transport mutually when compared to other MoS 2 nanostructures.…”

Section: Properties Of Mos 2 Quantum Dots (Qds)mentioning

confidence: 99%

“…The Raman frequencies depends on the number of layers of MoS 2 and from the Raman spectrum, it is possible to identify the number of layers in the synthesized MoS 2 QDs. [32] When compared with bulk MoS 2 ,…”

Section: Properties Of Mos 2 Quantum Dots (Qds)mentioning

confidence: 99%

“…Please do not adjust margins Recently, Ali et al [32] have reported the synthesis strategy of MoS 2 QDs obtained from wet grinding of pristine MoS 2 in NMP solution followed by mechanical shaking, bath sonication and probe sonication in NMP and 1, 2-dichlorobenzne (o-DCB). The supernatant solution was centrifuged and dried in order to obtain MoS 2 QDs.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

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Molybdenum disulfide quantum dots: synthesis and applications

Arul

Nithya²

2016

RSC Adv.

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Recently, two-dimensional (2D) layered transition metal dichalcogenides (TMD) have received a notable amount of interests due to its fascinating properties and versatile potential applications. One such material is Molybdenum Disulfide (MoS2), which has unique, superior functional properties including high current-carrying capacity and large carrier mobility which has drawn interest in many emerging fields. Especially, MoS2 quantum dots (QDs) are being fascinated for various applications such as electrocatalytic activity in hydrogen evolution reaction, sensing and bioimaging. In this review, we will take 2D TMD MoS2 QDs as a typical example and discuss its latest research advancement with emphasis on synthesis and applications.

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Fabrication of blue luminescent MoS 2 quantum dots by wet grinding assisted co-solvent sonication

Cited by 64 publications

References 45 publications

Chiral MoS₂ Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Chiral MoS₂ Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Resistive Switching in All-Printed, Flexible and Hybrid MoS2-PVA Nanocomposite based Memristive Device Fabricated by Reverse Offset

Molybdenum disulfide quantum dots: synthesis and applications

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Fabrication of blue luminescent MoS 2 quantum dots by wet grinding assisted co-solvent sonication

Cited by 64 publications

References 45 publications

Chiral MoS2 Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Chiral MoS2 Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Resistive Switching in All-Printed, Flexible and Hybrid MoS2-PVA Nanocomposite based Memristive Device Fabricated by Reverse Offset

Molybdenum disulfide quantum dots: synthesis and applications

Contact Info

Product

Resources

About

Chiral MoS₂ Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses

Chiral MoS₂ Quantum Dots: Dual‐Mode Detection Approaches for Avian Influenza Viruses