Highly concentrated MoS<sub>2</sub> nanosheets in water achieved by thioglycolic acid as stabilizer and used as biomarkers

Anbazhagan, Rajeshkumar; Wang, Hsing-Ju; Tsai, Hsieh‐Chih; Jeng, Ru‐Jong

doi:10.1039/c4ra07512a

Cited by 67 publications

(44 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The gap between the frequencies of these two phonon modes depends upon the method of exfoliation, a close gap shows that monolayer structure is more prominent. Frequency of the E 1 2g mode decreases and A 1g mode increases, when number of layers of MoS 2 are increased [43,44].…”

Section: Resultsmentioning

confidence: 98%

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

Ali

Siddiqui

Choi

et al. 2016

Journal of Luminescence

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 98%

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

Ali

Siddiqui

Choi

et al. 2016

Journal of Luminescence

View full text Add to dashboard Cite

“…Ac omparison of the DRIFT spectra of cysteine with Cys-2H-MoS 2 showed that the vibrational properties of the cysteine on the 2H-MoS 2 surface have been altered considerably through reaction with 2H-MoS 2 .F irstly,inc ysteine af eature at 2532 cm À1 attributed to the n SÀH was observed. [27][28][29][30][31][32][33][34][35] Secondly,c ysteine displayed broad features at 1745 and 1377 cm À1 corresponding to stretches of its carbox- This would suggest that the thiol group of cysteine had reacted in the presence of 2H-MoS 2 .All previous reports on the reaction between organic thiols and MoS 2 showed as imilar loss of the n SÀH by IR spectroscopy,l eading to the conclusion that the thiol had reacted with the MoS 2 .…”

mentioning

confidence: 78%

“…Pristine 2H-MoS 2 did not disperse in water ( Figure S6), and few methods to effectively disperse 2H-MoS 2 in water by functionalization exist. [30,46] Importantly,the aqueous Cys-2H-MoS 2 dispersions were stable for at least one week. Furthermore,wecould vary the pH of the aqueous dispersions,w ith no effect on the dispersability of the Cys-2H-MoS 2 ( Figure S6).…”

Section: Angewandte Chemiementioning

confidence: 98%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Am ajor focus of experimental research in recent years has concentrated on the development of synthetic routes to produce high-quality TMD nanosheets. [27][28][29][30][31][32][33][34][35] Unfortunately,i na ll of these reports,t here remains little to no insight into the thiol ligand/MoS 2 interaction. Importantly,t hin layered 2H-and 1T-MoS 2 display different properties,2 H-MoS 2 is as emi-conductor (energy gap % 1.2 eV) and ap hotoluminophore, [21,22] whereas 1T-MoS 2 is metallic and does not photoluminesce.…”

mentioning

confidence: 98%

See 1 more Smart Citation

Functionalization of Two‐Dimensional MoS₂: On the Reaction Between MoS₂ and Organic Thiols

et al. 2016

View full text Add to dashboard Cite

Tw o-dimensional layered transition metal dichalcogenides (TMDs) have attracted great interest owing to their unique properties and aw ide arrayo fp otential applications. However,d ue to their inert nature,p ristine TMDs are very challenging to functionalize.Wedemonstrate ageneral route to functionalize exfoliated 2H-MoS 2 with cysteine.C ritically, MoS 2 was found to be facilitating the oxidation of the thiol cysteine to the disulfide cystine during functionalization. The resulting cystine was physisorbed on MoS 2 rather than coordinated as at hiol (cysteine) filling S-vacancies in the 2H-MoS 2 surface,aso riginally conceived. These observations were found to be true for other organic thiols and indeed other TMDs.O ur findings suggest that functionalization of twodimensional MoS 2 using organic thiols may not yield covalently or datively tethered functionalities,r ather,i nt his instance,t hey yield physisorbed disulfides that are easily removed.Inthe rich family of two-dimensional (2D) layered nanomaterials,l ayered transition metal dichalcogenides (TMDs) have sparked increasing interest owing to their unique structures,w ide range of chemical compositions,a nd av ast array of unique physical properties. [1][2][3][4][5][6][7][8][9][10][11] TMDs have potential applications in electronic devices,o ptoelectronics,s ensing, energy storage,a nd catalysis. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Am ajor focus of experimental research in recent years has concentrated on the development of synthetic routes to produce high-quality TMD nanosheets. [14][15][16][17][18][19][20] However,routes towards the efficient high-yield synthesis or exfoliation of TMDs remain lacking, hindering the production of large quantities of TMD nanosheets.F unctionalization of such layered materials could facilitate the production of higher quantities of 2D TMDs, while also allowing for the tuning of their physical properties.Molybdenum disulfide (MoS 2 )isaprototypical TMD and acts as an excellent model system to explore the chemistry of 2D TMDs.2 DM oS 2 is most often isolated as one of two polymorphs: [14] in 2H-MoS 2 S-atoms coordinate to the Moatom in atrigonal prismatic fashion, whereas in 1T-MoS 2 the Mo-atom is octahedrally ligated. Importantly,t hin layered 2H-and 1T-MoS 2 display different properties,2 H-MoS 2 is as emi-conductor (energy gap % 1.2 eV) and ap hotoluminophore, [21,22] whereas 1T-MoS 2 is metallic and does not photoluminesce. [3] Thec ovalent functionalization of 1T-MoS 2 has recently been reported, [23,24] employing ar ather harsh chemical exfoliation (ce) procedure.N ow ell-characterized examples of covalent functionalization of 2H-MoS 2 have been reported to date.W er ecently reported the mild functionalization of 2H-MoS 2 through ligation of surface S-atoms to coordination complexes, [25] our efforts are now focused on exploring routes towards the covalent functionalization of 2H-MoS 2 .Recent reports have claimed the functionalization of both ce-1T-a nd 2H-MoS 2 by reaction with organic thiols.I n as emina...

show abstract

“…Bulk TMDs are semiconductors with an intrinsic band-gap and exhibit noteworthy optical and electronic properties desirable for energy conversion and storage, [1][2][3][4][5][6][7] sensing, [8][9][10] and photodynamic/ photothermal therapy. [11][12][13] Analogously to graphite, numerous van der Waals forces keep together the layered sheets of TMDs forming stacks. However, despite their close similarity to graphene, TMDs offer significant advantages related to their band-gap dependent electronic properties, 14,15 which can be tuned by altering the transition metal and/or the chalcogen composition.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

et al. 2017

View full text Add to dashboard Cite

The covalent functionalization of exfoliated semiconducting MoS 2 by 1,2-dithiolanes bearing an ethylene glycol alkyl chain terminated to a butoxycarbonyl-protected amine and a photoactive pyrene moiety is accomplished. The MoS 2 -based nanohybrids were fully characterized by complementary spectroscopic, thermal, and microscopy techniques. Markedly, density functional theoretical studies combined with X-ray photoelectron spectroscopy analysis demonstrate preferential edge functionalization, primarily via sulfur addition along partially sulfur saturated zig-zag MoS 2 molybdenum-edges, preserving intact the 2D basal structure of functionalized MoS 2 -based nanohybrids as confirmed by high-resolution transmission electron microscopy and electron energy loss spectroscopy. Furthermore, in the MoS 2 -pyrene hybrid, appreciable electronic interactions at the excited state between the photoactive pyrene and the semiconducting MoS 2 were revealed as inferred by steady-state and time-resolved photoluminescence spectroscopy, implying its high potentiality to function in energy conversion schemes.

show abstract

Highly concentrated MoS₂ nanosheets in water achieved by thioglycolic acid as stabilizer and used as biomarkers

Abstract: Synthesis of water soluble MoS2 quantum dots from the monolayer nanosheets of MoS2, using thioglycolic acid (TGA) was reported in this study. TGA molecules not only exfoliated the bulk of MoS2, but also modified the hydrophobic surface of MoS2 with hydrophilic carboxylic acid groups.

Cited by 67 publications

References 24 publications

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

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

Functionalization of Two‐Dimensional MoS₂: On the Reaction Between MoS₂ and Organic Thiols

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

Contact Info

Product

Resources

About

Highly concentrated MoS2 nanosheets in water achieved by thioglycolic acid as stabilizer and used as biomarkers

Abstract: Synthesis of water soluble MoS2 quantum dots from the monolayer nanosheets of MoS2, using thioglycolic acid (TGA) was reported in this study. TGA molecules not only exfoliated the bulk of MoS2, but also modified the hydrophobic surface of MoS2 with hydrophilic carboxylic acid groups.

Cited by 67 publications

References 24 publications

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

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

Functionalization of Two‐Dimensional MoS2: On the Reaction Between MoS2 and Organic Thiols

Functionalization of MoS2 with 1,2-dithiolanes: toward donor-acceptor nanohybrids for energy conversion

Contact Info

Product

Resources

About

Highly concentrated MoS₂ nanosheets in water achieved by thioglycolic acid as stabilizer and used as biomarkers

Functionalization of Two‐Dimensional MoS₂: On the Reaction Between MoS₂ and Organic Thiols