Tunable photoluminescence of MoS2 quantum dots passivated by different functional groups

Zhu, Xingqun; Xiang, Junxiang; Li, Jing; Feng, Chao; Liu, Ping; Xiang, Bin

doi:10.1016/j.jcis.2017.09.118

Cited by 34 publications

(32 citation statements)

References 25 publications

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“…Furthermore, surface passivation was also valid for band gap tuning of TMDs QDs. Our group realized a band gap tunability in MoS 2 QDs passivated by different functional groups [ 40 ]. As shown in Figure 3 e, the UV-visible absorption spectra characterization indicated that the absorption edge of MoS 2 QDs in DI water was located at ~310 nm, while the absorption edge of MoS 2 QDs dispersed in DMF and ethanol were located at ~260 nm and ~335 nm, respectively.…”

Section: Properties and Characterizationmentioning

confidence: 99%

“…At the same time, hydrothermal method can also be used to prepare TMDs QDs [ 40 , 145 , 146 , 147 ]. Wang et al synthesized MoS 2 QDs by using Na 2 MoO 4 ·2H 2 O and L-cysteine as the precursors [ 147 ].…”

Section: Preparationmentioning

confidence: 99%

“…These novel properties promote the exploration of new methods to prepare the low-dimensional TMDs. Numerous methods are available for their synthesis—mechanical exfoliation [ 30 , 31 ], solution-based exfoliation [ 29 , 32 , 33 , 34 ], Li-intercalation exfoliation [ 35 , 36 ], laser and plasma-induced thinning [ 37 , 38 ], hydrothermal method [ 39 , 40 ] chemical vapor deposition (CVD) [ 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ], annealing of the (NH 4 ) 2 MoS 4 precursor [ 51 , 52 ], chemical vapor transport [ 53 , 54 ], and so on. Driven by advanced preparation methods and increased research interests, applications based on low-dimensional TMDs have enabled scientists to conquer the appealing properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

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Properties, Preparation and Applications of Low Dimensional Transition Metal Dichalcogenides

et al. 2018

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Low-dimensional layered transition metal dichalcogenides (TMDs) have recently emerged as an important fundamental research material because of their unique structural, physical and chemical properties. These novel properties make these TMDs a suitable candidate in numerous potential applications. In this review, we briefly summarize the properties of low-dimensional TMDs, and then focus on the various methods used in their preparation. The use of TMDs in electronic devices, optoelectronic devices, electrocatalysts, biosystems, and hydrogen storage is also explored. The cutting-edge future development probabilities of these materials and numerous research challenges are also outlined in this review.

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Section: Properties and Characterizationmentioning

confidence: 99%

Section: Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Properties, Preparation and Applications of Low Dimensional Transition Metal Dichalcogenides

et al. 2018

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“…In addition to the thin film type, MoS 2 quasi-and/or quantum dots (QDs) have also received much attention owing to the appearance of quantum confinement effect in this material [7]. It results in the direct bandgap of multi-and mono-layer MoS 2 nanodots are expanded in a range of 2.5 eV to 2.9 eV in comparison with the direct gap of single layer MoS 2 sheet of 1.9 eV [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…This feature allows the MoS 2 nanomaterials being used in a large range of application, including of the novel nanoelectronic and optoelectronic devices. MoS 2 quasi-QDs or nanodots can be synthesized through several ways such as wet grinding assisted co-solvent sonication [10], hydrothermal treatment in combination with bath-and probe-sonication [7,11], and thermal annealing process of single layer MoS 2 grown by chemical vapor deposition (CVD) [2]. However, these approaches normally include several processes, which make the growth method more complicated.…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Multi-layer MoS\(_2\) Nanodots by Chemical Vapor Deposition

Vuong¹,

Hung²

2018

Comm. in Phys.

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The current work reports a direct synthesis of multi-layer MoS2 nanodots by a chemical vapor deposition method. The morphological, structural and optical properties of the growing MoS2 are investigated by field emission scanning electron microscopy (FESEM), Raman and Photoluminescence (PL) spectroscopy, respectively. High magnification FESEM image reveals a layer of MoS2 nanodots with the average size of about 10 nm. Resonance Raman data exhibits the two active E12g and A1g modes corresponding to in-plane variation of Mo and S atoms centered at 383.3 cm-1 and to out of plane variation of S atoms located at 407.1 cm-1, respectively. The spacing between two peaks is about 23.8 cm-1, which can be used to evaluate the number of MoS2 layer. The Raman spectrum also indicates any intensity enhancement of the A1g peak compared to the E12g peak. This result is elucidated through the quantum confinement effect. The PL emission shows a pronounced peak at 505 nm that is significant blue shift compared to single MoS2 layer. The interpretation of this phenomena is discussed in detail.

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Coaxial Multiphase Flame for Continuous‐Flow Assembly of Ternary Nanocomposite Photocatalysts

Kwak

Prakash

Lim

et al. 2022

Adv Funct Materials

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For the low-cost production of graphene (G)-included composites, the growth of graphene on a transition metal in hydrocarbon flames is introduced, where the hydrocarbons are adsorbed on the metal surface, followed by catalytic decomposition, leading to continuous G formation. On the other hand, the flame synthesis of G is still a batch process, limiting the practical applications of such materials. Moreover, the hybridization of G for enhanced catalytic activities requires additional reaction and separation steps. Here, a coaxial multiphase flame is generated and combined with a rotating Cu-Ni foil and ultrasonic bath for the continuous-flow assembly of ternary G composites with low-cost and rapid implementation. The continuous flows to generate a multicomponent flame consist of MoS 2 particle-laden N 2 gas (inner), titanium isopropoxide vapor-laden CH 4 -air (middle), and ethanol liquid (outer), while Cu-Ni foil plies between the flame and ultrasonic bath for the assembly and dispersion of MoS 2 -TiO 2 @G composites. The configuration of the composite can be modulated by replacing the MoS 2 flow with a CdS flow to construct CdS-TiO 2 @G. From photocatalytic H 2 production and CO 2 reduction tests, the developed coaxial flame provides comparable performance with analogous architectures from the usual multistep methods despite the highthroughput production.

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Tunable photoluminescence of MoS2 quantum dots passivated by different functional groups

Cited by 34 publications

References 25 publications

Properties, Preparation and Applications of Low Dimensional Transition Metal Dichalcogenides

Properties, Preparation and Applications of Low Dimensional Transition Metal Dichalcogenides

Direct Synthesis of Multi-layer MoS\(_2\) Nanodots by Chemical Vapor Deposition

Coaxial Multiphase Flame for Continuous‐Flow Assembly of Ternary Nanocomposite Photocatalysts

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