Electron transfer dynamics in MoS2 nanoclusters: Normal and inverted behavior

Parsapour, Fazel; Kelley, David F.; Craft, S.A.; Wilcoxon, J. P.

doi:10.1063/1.471128

Cited by 72 publications

(50 citation statements)

References 52 publications

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“…Such clusters were mainly produced by reactions in inverse micelles. In a typical MoS2 cluster synthesis, 230,231 MoCl4 is dissolved in a degassed inverse micelle solution containing octane as a solvent, hexanol as a cosurfactant and trididecylmethylammonium chloride as a surfactant. Clusters are immediately formed after H2S injection, and control over the cluster size is possible by changing the nature of the surfactant.…”

Section: Column Ivb and Vb Chalcogenidesmentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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Abstract:In this paper, we review recent progresses on colloidal growth of 2D nanocrystals.We identify four main sources of anisotropy which lead to the formation of plate-and sheetlike colloidal nanomaterials. Defect induced anisotropy is a growth method which relies on the presence of topological defects at the nanoscale to induce 2D shapes objects. Such a method is particularly important in the growth of metallic nanoobjects. Another way to induce anisotropy is based on ligand engineering. The availability of some nanocrystal facets can be tuned by selectively covering the surface with ligands of tunable thickness. Cadmium chalcogenides nanoplatelets (NPLs) strongly rely on this method which offers atomic control in the thinner direction, down to a few monolayers. 2D objects can also be obtained by post or in situ self-assembly of nanocrystals. This growth method differs from the previous ones in the sense that the elementary objects are not molecular precursors, and is a common method for lead chalcogenide compounds. Finally, anisotropy may simply rely on the lattice anisotropy itself as it is common for rod-like nanocrystals. Colloidally grown Transition Metal DiChalcogenides (TMDC) in particular result from such process. We also present hybrid syntheses which combine several of the previously described methods and other paths, such as cation exchange, which expand the range of available materials. Finally, we discuss in which sense 2D-objects differ from 0D nanocrystals and review some of their applications in optoelectronics, including lasing and photodetection, and biology.

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Section: Column Ivb and Vb Chalcogenidesmentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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“…[6] If we recall the estimated potential in the bulk material is +O. 1 V, we can see that quantum size effects have made these nanoclusters into very strong reducing agents.…”

Section: Mos? -Optical Proderties and Electronic Structurementioning

confidence: 99%

“…If we attribute most the band-gap shift observed in figure 1 and 2 to changes in the conduction band potential (because of the lower electron compared to hole mass) then we estimate a value of -.66 V and -1.46 V vs. NHE for the D=4.5 nm and D=3.O nm samples. [6] By Table I summarizes the results of PL integrated area, PL(area), normalized by the cluster absorbance (abs) at the excitation wavelength indicated for one size, D=3.O nm of nanocluster. Very similar trends were observed for other sizes of cluster.…”

Section: Mos? -Optical Proderties and Electronic Structurementioning

confidence: 99%

“…This implies that the various mechanisms for radiative recombination for a given size cluster are influenced by the details of the cluster interface. Complete details for such energy calculations and the underlying assumptions are given elsewhere [6].…”

Section: Mos? -Optical Proderties and Electronic Structurementioning

confidence: 99%

“…Such binding can be demonstrated to be quite strong as a MoS2hpy complex elutes as a single entity during HPLC. [6] It has been further demonstrated that the molar ratio of Mo to bpy at full edge site occupation is about 2: 1, and so this was the chosen concentration for bpy, and tetramethyl substituted bpy (tmb) used in our studies.…”

Section: Mos? -Optical Proderties and Electronic Structurementioning

confidence: 99%

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Studies of Photoredox Reactions on Nanosize Semiconductors

1996

Self Cite

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/8'2600 0Light induced electron transfer (ET) from nanosize semiconductors of MoS2 to organic electron acceptors such as 2,2'-bipyridine (bpy) and methyl substituted 4,4',5,5'-tetramethyl-2,2'-bipyridine (tmb) was studied by static and time resolved photoluminescence spectroscopy. The kinetics of ET were varied by changing the nanocluster size (the band gap), the electron acceptor, and the polarity of the solvent. MoS2 is an especially interesting semiconductor material as it is an indirect semiconductor in bulk form, and has a layered covalent bonding arrangement which is highly resistant to photocorrosion.

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Nanosized Photocatalysts in Environmental Remediation

Wilcoxon

Abrams

2010

Nanotechnology

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We review the science and technology underlying the synthesis of nanosized photocatalysts and their application in environmental remediation. Certain types of semiconductor nanoparticles in both dispersed and supported form can oxidize toxic organic chemicals in liquid, gas and solid phases. This mineralization process can be driven by light and an optimized process can function under ambient conditions of temperature and pressure, producing CO 2 and dilute mineral acids. Such photocatalysis is a potentially inexpensive alternative to other methods for destroying both chemical and biological toxins in the environment. Our review includes discussion of several nanosized photocatalysts with an emphasis on the metal oxide TiO 2 and metal sulfides, especially MoS 2 . We discuss their characterization and the factors which influence their photocatalytic activity and selectivity. Issues such as control of size, quantum confinement, surface chemistry and carrier recombination rate play an important role in the functioning of these photocatalysts. Finally, we summarize some recent applications of TiO 2 films in environmental remediation technology which are just being commercialized. We also discuss future research needs in this area required for an economically viable technology.

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Electron transfer dynamics in MoS2 nanoclusters: Normal and inverted behavior

Cited by 72 publications

References 52 publications

Two-Dimensional Colloidal Nanocrystals

Two-Dimensional Colloidal Nanocrystals

Studies of Photoredox Reactions on Nanosize Semiconductors

Nanosized Photocatalysts in Environmental Remediation

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