Advances in transition metal dichalcogenide-based two-dimensional nanomaterials

Monga, Divya; Sharma, Surbhi; Shetti, Nagaraj P.; Basu, Soumen; Reddy, Kakarla Raghava; Aminabhavi, Tejraj M.

doi:10.1016/j.mtchem.2020.100399

Cited by 69 publications

(55 citation statements)

References 193 publications

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“…Two-dimensional (2D) materials attract much attention [1][2][3][4][5][6][7][8][9][10][11][12][13] owing to the large specific surface area and a wide spectrum of unique physical and chemical properties, which are of vivid interest for electronics, spintronics, energetics, sensors, photonics, catalysis, biomedical and other applications. There are known few families of 2D materials and composites beyond graphene.…”

Section: Introductionmentioning

confidence: 99%

“…There are known few families of 2D materials and composites beyond graphene. Transition metal dichalcogenides constructed by twodimensional sheets stacked by van der Waals (vdW) forces, for example, MoS2 and related substances with metallic conductivity, are rather inert because of a low density of active centers and should be modified for many applications [11][12][13][14][15][16][17][18][19]. Other metal chalcogenides, including ternary [14,16], incline to undesirable oxidation and corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

Mikhlin¹,

Борисов

Vorobyev³

et al. 2022

Preprint

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We introduce here a multifunctional material composed of alternating atomic sulfide sheets close to CuFeS2 and Mg-based hydroxide ones (valleriite), which are assembled due to their electric charges of opposite sign. Valleriite particles of 50-200 nm in the lateral size and 10-20 nm thick were synthesized via a simple hydrothermal pathway using various concentrations of precursors and dopants, and examined with XRD, TEM, EDS, X-ray photoelectron spectroscopy, reflection electron energy loss spectroscopy (REELS), Mössbauer, Raman and UV-vis-NIR spectroscopies, magnetic, dynamic light scattering, zeta potential measurements. The electronic, magnetic and optical characteristics are found to be critically dependent of the charge (electron density) at the narrow-gap sulfide layers containing Cu+ and Fe3+ cations, and can be tuned via the composition of hydroxide part. Particularly, substitution of Mg2+ with Al3+ increases the negative charge of the hydroxide layers and reduces the content of Fe3+-OH centers (10-45% of total iron); the effects of Cr and Co dopants entering both layers are more complicated. Mössbauer doublets of paramagnetic Fe3+ detected at room temperature transform to several Zeeman sextets at 4.2 K; the hyperfine fields up to 500 kOe and complex magnetic behavior, but not pure paramagnetism or antiferromagnetism, were observed for valleriites with the higher positive charge of the sulfide sheets, probably due to the depopulation of the minority-spin 3d states of S-bonded Fe3+ ions. Aqueous colloids of valleriite show optical absorption at 500 - 750 nm, which, along with the peaks at the same energies in REELS, may arise due to quasi-static dielectric resonance involving the vacant Fe 3d band and being dependent on the composition of both layers too. These and other findings call attention to the of valleriites as a new rich family of 2D materials for a variety of potential applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

Mikhlin¹,

Борисов

Vorobyev³

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…Different techniques are used to classify metal oxide to assess its structural, physical, and chemical properties (Monga et al 2021). Furthermore, there are a few unique analytical methods that are used depending on the intended use.…”

Section: Characterizationmentioning

confidence: 99%

Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview

Prakruthi

Ujwal

Yashas

et al. 2021

Environ Sci Pollut Res

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Many untreated and partly treated wastewater from the home and commercial resources is being discharged into the aquatic environment these days, which contains numerous unknown and complex natural and inorganic compounds. These compounds tend to persist, initiating severe environmental problems, which affect human health. Conventionally, physicochemical treatment methods were adopted to remove such complex organic chemicals, but they suffer from critical limitations. Over time, photocatalysis, an advanced oxidation process, has gained its position for its efficient and fair performance against emerging organic pollutant decontamination. Typically, photocatalysis is a green technology to decompose organics under UV/visible light at ambient conditions. Semiconducting nanometal oxides have emerged as pioneering photocatalysts because of large active surface sites, flexible oxidation states, various morphologies, and easy preparation. The current review presents an overview of emerging organic pollutants and their effects, advanced oxidation processes, photocatalytic mechanism, types of photocatalysts, photocatalyst support materials, and methods for improving photodegradation efficiency on the degradation of complex emerging organic pollutants. In addition, the recent reports of metal-oxide-driven photocatalytic remediation of emerging organic pollutants are presented in brief. This review is anticipated to reach a broader scientific community to understand the first principles of photocatalysis and review the recent advancements in this field.

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“…Two-dimensional (2D) materials attract much attention nowadays [1][2][3][4][5][6][7][8][9][10][11][12][13] owing to the large specific surface area and a wide spectrum of unique physical and (electro)chemical properties, which are of vivid interest for electronics, spintronics, energetics, sensors, photonics, catalysis, biomedical applications, and other areas. Many efforts have been made in recent years to manufacture and explore such materials beyond graphene as transition metal dichalcogenides, chalcogenides and ternary metal dichalcogenides, [11][12][13][14][15][16] constructed by two-dimensional sheets stacked mainly by van der Waals (vdW) forces. For example, MoS2 and related substances having metallic conductivity are rather inert because of a low density of active centers and should be modified for many applications, while other metal chalcogenides incline to undesirable oxidation and corrosion.…”

Section: Introductionmentioning

confidence: 99%

“…For example, MoS2 and related substances having metallic conductivity are rather inert because of a low density of active centers and should be modified for many applications, while other metal chalcogenides incline to undesirable oxidation and corrosion. [11][12][13][14][15][16][17][18][19] A variety of electronic, magnetic, optical properties of Mo and W dichalcogenides, as well as MXenes with Ti3C2Tx as a typical representative (Tx is the surface terminal groups O, OH, S, F), is limited by the metal nature. Consequently, the search for novel two-dimensional systems with requested characteristics is a very challenging task.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

Mikhlin¹,

Борисов

Vorobyev³

et al. 2021

Preprint

View full text Add to dashboard Cite

Two-dimensional phenomena are attracting enormous interest at present and the search for novel 2D materials is very challenging. We propose here the layered material valleriite composed of altering atomic sheets of Cu-Fe sulfide and Mg-based hydroxide synthesized via a simple hydrothermal pathway as particles of 50-200 nm in the lateral size and 10-20 nm thick. The solid products and aqueous colloids prepared with various precursor ratios were examined using XRD, TEM, EDS, X-ray photoelectron spectroscopy (XPS), reflection electron energy loss spectroscopy (REELS), Raman, Mössbauer, UV-vis-NIR spectroscopies, magnetic, dynamic light scattering, zeta potential measurements. The material properties are largely determined by the narrow-gap (less than 0.5 eV) sulfide layers containing Cu+ and Fe3+ cations, monosulfide and minor polysulfide anions but are strongly affected by the hydroxide counterparts. Particularly, Fe distribution between sulfide (55-90%) and magnesium hydroxide layers is controlled through insertion of Al into the hydroxide part and by Cr and Co dopants entering both layers. Room-temperature Mössbauer signals of paramagnetic Fe3+ transformed to several Zeeman sextets with hyperfine magnetic fields up to 500 kOe in the sulfide layers at 4 K. Paramagnetic or more complicated characters were observed for valleriites with higher and lower Fe concentrations in hydroxide sheets, respectively. Valleriite colloids showed negative zeta potentials, suggesting negative electric charging of the hydroxide sheets, and optical absorption maxima between 500 nm and 700 nm, also depended on the Fe distribution. The last features observed also in the REELS spectra may be due to localized surface plasmon or, more likely, quasi-static dielectric resonance. The tunable composition, electronic, magnetic, optic and surface properties highlight valleriites as a rich platform for novel 2D composites promising for numerous applications.

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Advances in transition metal dichalcogenide-based two-dimensional nanomaterials

Cited by 69 publications

References 193 publications

Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview

Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

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