Two-dimensional transition metal carbide and nitride (MXene) derived quantum dots (QDs): synthesis, properties, applications and prospects

Shao, Bin; Liu, Zhifeng; Zeng, Guangming; Wang, Han; Liang, Qinghua; He, Qingyun; Cheng, Min; Zhou, Chengyun; Jiang, Longbo; Song, Biao

doi:10.1039/d0ta01552k

Cited by 232 publications

(141 citation statements)

References 175 publications

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“…[30] Furthermore, our synthesized QDs could also achieve the condition that functional groups T x could locate at the hollow position between three adjacent "C" atoms below the transition atom, "Ti" on the two sides of the MXene as predicted by the density functional theory for the MXenes to be the most stable form. [31] However, future studies will be seriously required to really map the structure of our synthesized QDs. Figure S5 in the Supporting Information presents the detailed schematic of the formation of MXene QDs-monolayer WS 2 heterostructure.…”

Section: Possible Reaction Routes During the Long-time Stirring Procementioning

confidence: 99%

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS₂ Heterostructure

Neupane

Wang

Tebyetekerwa

et al. 2021

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a very recent family of 2D nanomaterials, depth optical and optoelectronic studies of various 2D MXenes have been lacking yet. Similar to early demonstrated graphene, and TMD-based quantum dots (QDs), [4] a few research groups have introduced the synthesis of MXene (Ti 3 C 2 T x , T x = F 2 , (OH) 2) QDs via a solvothermal technique with etching Al atoms from the commercially available Ti 3 AlC 2. [5] In the same regard, we have also developed a simple and cost effective synthesis of Ti 3 C 2 T x QDs via chemical solution method, which follows the long-time magnetic stirring process initiated etching of Al atoms from commercial Ti 3 AlC 2 powder at room temperature. Such 2D material-based QDs are found effective for various optical and photonics applications. [6] The scientific investigations of lightmatter interactions and many body correlations have been highly fascinating research topics since a decade ago. The monolayer of TMDs provides a unique platform for such interactions, [7-9] which leads to the formation of many excitonic complexes. In particular, the reduced dielectric screening and strong Coulomb interaction in the monolayer of TMDs generate tightly bound high binding energy excitonic systems. [7] Moreover, excitons residing in the two different valleys at the K point of the Brillouin zone can also interact in the presence of a high density of excitons, [9,10] and facilitate the formation of high order excitons. In this regard, tightly bound biexcitons have been experimentally demonstrated in TMD monolayers, in WS 2 , WSe 2 , and MoS 2 monolayers. [11,12] However, the binding energies of these biexcitons determined in the range of 50−70 meV are 1 order higher in magnitude than the theoretically predicted values. [13] To resolve this discrepancy, Zhang et al. postulated the concept of excited state biexciton with the consideration that the biexciton structure as a charge is attached to the tail of a trion instead of four particles (e − h + e − h +) symmetric state, and calculated the binding energy of TMDs monolayer in the range of experimental value. [14] This postulate was furthermore experimentally validated in suspended MoSe 2 monolayer. [15] However, very recently, a few research groups independently reported the existence of four particles symmetric state of biexcitions in WSe 2 , [16-18] WS 2 , [18] and MoSe 2 , [19] monolayer, which is same as the earlier theoretical prediction. [13] These studies confirmed the formation Since the Ti 3 C 2 was discovered in 2011, the family of MXenes has attracted much attention. MXenes offer great potential in the tuning of many fundamental properties by the synthesis of new structures. The synthesis methods of MXene mainly require steps including immersing a MAX phase in hydrofluoric acid (HF) and processing at high temperatures. However, the HF may be hard to acquire in many countries and processing at high temperatures may cause risk issues. In this article, a simple and cost-effective synthesis of Ti 3 C 2 T x quantum dots (QDs) via chemical solution meth...

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Section: Possible Reaction Routes During the Long-time Stirring Procementioning

confidence: 99%

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS₂ Heterostructure

Neupane

Wang

Tebyetekerwa

et al. 2021

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“…40 The as-prepared MQDs showed the same hexagonal lattices as the MAX phase, while exhibited smaller diameters of less than 10 nm. 62 Generally, 0D MQDs are exfoliated from selected precursors via chemical or physical methods, such as hydrothermal/solvothermal, 63,64 ultrasound treatment 65,66 and reux. 46 Defects are created in this process and are served as the cutting points so that the layer sheets could be cut into smaller QDs.…”

Section: Synthesis Of 0d Quantum Dotsmentioning

confidence: 99%

MXene derivatives: synthesis and applications in energy convention and storage

Sui

Chen

et al. 2021

RSC Adv.

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“…Since visible light for about 43% of the solar spectrum, many researchers have conducted extensive research on the design of visible light-driven photocatalysts [11][12][13][14]. Two-dimensional (2D) layered materials with unique optoelectronic properties and sufficient activity are attracting more and more attention [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of direct Z-scheme black phosphorus nanosheets/Ag2CO3 heterojunction photocatalyst with enhanced stability and visible light photocatalytic activity

Wang

Zhao

et al. 2021

J Mater Sci

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In this paper, PDDA-functionalized black phosphorus nanosheets (BP) was used to construct BP/Ag 2 CO 3 heterojunction photocatalyst by a simple co-precipitation process. The morphology, photoelectrochemical, and photocatalytic performance of BP/Ag 2 CO 3 heterojunction photocatalyst were systematically characterized and analyzed. BP was proved to enhance the transport efficiency and restrain the recombination efficiency of the carriers in the BP/Ag 2 CO 3 heterojunction. At the same time, BP greatly suppressed the Ag 2 CO 3 photocorrosion and improved the stability for methyl orange (MO) degradation. After four cycles, compared with the 19.2% degradation rate of MO in pure Ag 2 CO 3 , the photocatalytic activity remained as high as 87.1% in 15-BP/Ag 2 CO 3 heterojunction. The Mott-Schottky and active species capture experiments enabled us to obtain the BP/Ag 2 CO 3 heterojunction band gap configuration, and propose the reaction mechanism of the direct Z-scheme. The in-situ X-ray photoelectron spectroscopy (XPS) analysis and work function calculation verified the charge transfer in BP/Ag 2 CO 3 direct Z-scheme heterojunction. This Z-scheme mechanism interpreted the enhanced photocatalytic stability of BP/ Ag 2 CO 3 for inhibiting the Ag ? photoreduction in the conduction band of Ag 2-CO 3 , and meanwhile elucidated the extremely improved photocatalytic activity by restraining the recombination of electron-hole pairs. This work is expected to Handling Editor: Mark Bissett.

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Two-dimensional transition metal carbide and nitride (MXene) derived quantum dots (QDs): synthesis, properties, applications and prospects

Abstract: Recent progress of MXene QDs, including their synthesis, properties, applications, and their future perspectives and challenges.

Cited by 232 publications

References 175 publications

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS₂ Heterostructure

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS₂ Heterostructure

MXene derivatives: synthesis and applications in energy convention and storage

Fabrication of direct Z-scheme black phosphorus nanosheets/Ag2CO3 heterojunction photocatalyst with enhanced stability and visible light photocatalytic activity

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Two-dimensional transition metal carbide and nitride (MXene) derived quantum dots (QDs): synthesis, properties, applications and prospects

Abstract: Recent progress of MXene QDs, including their synthesis, properties, applications, and their future perspectives and challenges.

Cited by 232 publications

References 175 publications

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS2 Heterostructure

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS2 Heterostructure

MXene derivatives: synthesis and applications in energy convention and storage

Fabrication of direct Z-scheme black phosphorus nanosheets/Ag2CO3 heterojunction photocatalyst with enhanced stability and visible light photocatalytic activity

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Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS₂ Heterostructure

Highly Enhanced Light–Matter Interaction in MXene Quantum Dots–Monolayer WS₂ Heterostructure