Preparation and Photocatalytic Behavior of MoS2 and WS2 Nanocluster Sensitized TiO2

Ho, Wingkei; Yu, Jimmy C.; Lin, Jun; Yu, Jiaguo; Li, Puishan

doi:10.1021/la049838g

Cited by 532 publications

(328 citation statements)

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“…A bulk heterojunction solar cell made from TiO 2 nanoparticles, MoS 2 atomic layer nanosheets and poly(3-hexylthiophene) (P3HT) was recently demonstrated with 1.3% photoconversion efficiency 145 . Similarly, electrochemical solar cells with TiO 2 were sensitized with WS 2 , which acts as a stable, inorganic absorber material 146,147 . TMDCs have also been demonstrated as conductors and electron-blocking layers in polymer LEDs 53,148 .…”

Section: Optoelectronicsmentioning

confidence: 99%

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

et al. 2012

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699M any two-dimensional (2D) materials exist in bulk form as stacks of strongly bonded layers with weak interlayer attraction, allowing exfoliation into individual, atomically thin layers 1 . The form receiving the most attention today is graphene, the monolayer counterpart of graphite. The electronic band structure of graphene has a linear dispersion near the K point, and charge carriers can be described as massless Dirac fermions, providing scientists with an abundance of new physics 2,3 . Graphene is a unique example of an extremely thin electrical and thermal conductor 4 , with high carrier mobility 5 , and surprising molecular barrier properties 6,7 .Many other 2D materials are known, such as the TMDCs 8,9 , transition metal oxides including titania-and perovskite-based oxides 10,11 , and graphene analogues such as boron nitride (BN) 12,13 . In particular, TMDCs show a wide range of electronic, optical, mechanical, chemical and thermal properties that have been studied by researchers for decades 9,14,15 . There is at present a resurgence of scientific and engineering interest in TMDCs in their atomically thin 2D forms because of recent advances in sample preparation, optical detection, transfer and manipulation of 2D materials, and physical understanding of 2D materials learned from graphene.The 2D exfoliated versions of TMDCs offer properties that are complementary to yet distinct from those in graphene. Graphene displays an exceptionally high carrier mobility exceeding 10 6 cm 2 V -1 s -1 at 2 K (ref. 16) and exceeding 10 5 cm 2 V -1 s -1 at room temperature for devices encapsulated in BN dielectric layers 5 ; because pristine graphene lacks a bandgap, however, fieldeffect transistors (FETs) made from graphene cannot be effectively switched off and have low on/off switching ratios. Bandgaps can be engineered in graphene using nanostructuring [17][18][19] , chemical functionalization 20 and applying a high electric field to bilayer graphene 21 , but these methods add complexity and diminish mobility. In contrast, several 2D TMDCs possess sizable bandgaps around 1-2 eV (refs 9,14), promising interesting new FET and optoelectronic devices.TMDCs are a class of materials with the formula MX 2 , where M is a transition metal element from group IV (Ti, Zr, Hf and so on), group V (for instance V, Nb or Ta) or group VI (Mo, W and so on), and X is a chalcogen (S, Se or Te). These materials form layered structures of the form X-M-X, with the chalcogen atoms in two hexagonal planes separated by a plane of metal atoms, as shown in Fig. 1a. Adjacent layers are weakly held together to form the bulk crystal in a variety of polytypes, which vary in stacking orders and metal atom coordination, as shown in Fig. 1e. The overall symmetry of TMDCs is hexagonal or rhombohedral, and the metal atoms have octahedral or trigonal prismatic coordination. The electronic properties of TMDCs range from metallic to semiconducting, as summarized in Table 1. There are also TMDCs that exhibit exotic behaviours such as charge density waves ...

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Section: Optoelectronicsmentioning

confidence: 99%

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

et al. 2012

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“…Over the past two decades, oxide semiconductor mediated photocatalysts have attracted a great deal of attention in the purification of environmental contaminants [1][2][3][4][5][6]. Among the various oxide semiconductor photocatalysts, TiO 2 has proven to be the most suitable material for its long-term chemical stability, powerful oxidation strength, non-toxicity and low cost.…”

Section: Introductionmentioning

confidence: 99%

Sonochemical synthesis and characterization of magnetic separable Fe₃O₄–TiO₂nanocomposites and their catalytic properties

Jiang

Zhang

Gong³

et al. 2010

International Journal of Smart and Nano Materials

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A novel sonochemical method is described for the preparation of Fe 3 O 4 -TiO 2 photocatalysts in which nanocrystalline titanium dioxide particles are directly coated onto a magnetic core. The Fe 3 O 4 nanoparticles were partially embedded in TiO 2 agglomerates. TiO 2 nanocrystallites were obtained by hydrolysis and condensation of titanium tetraisopropyl in the presence of ethanol and water under high-intensity ultrasound irradiation. This method is attractive since it eliminated the high-temperature heat treatment required in the conventional sol-gel method, which is important in transforming amorphous titanium dioxide into a photoactive crystalline phase. In comparison to other methods, the developed method is simple, mild, green and efficient. The magnetization hysteresis loop for Fe 3 O 4 -TiO 2 nanocomposites indicates that the hybrid catalyst shows superparamagnetic characteristics at room temperature. Photocatalytic activity studies confirmed that the as-prepared nanocomposites have high photocatalytic ability toward the photodegradation of RhB solution. Furthermore, the photodecomposition rate decreases only slightly after six cycles of the photocatalysis experiment. Thus, these Fe 3 O 4 -TiO 2 nanocomposites can be served as an effective and conveniently recyclable photocatalyst.

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“…It is now recognized that polyhedral closed-caged NS under certain energetic considerations are thermodynamically more stable than isolated basal sheets of the lamellar structure. 8 These MoS 2 NS have attracted considerable attention recently because of their potential use in microlubrication, 9 oil refinement, 10 photocatalysis, 11 and photodetector applications. 12 On the other hand, MoS 2 has interesting properties in the case of a 2D ultrathin atomic layer structure.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis of Colloidal 2D/3D MoS₂ Nanostructures by Pulsed Laser Ablation in an Organic Liquid Environment

et al. 2014

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Two-dimensional MoS 2 nanosheets (2D MoS 2 NS) and fullerene-like MoS 2 nanostructures (3D MoS 2 NS) with varying sizes are synthesized by nanosecond laser ablation of hexagonal crystalline 2H-MoS 2 powder in organic solution (methanol). Structural, chemical, and optical properties of MoS 2 NS are characterized by optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman and UV−vis−near infrared absorption spectroscopy techniques.Results of the structural analysis show that the obtained MoS 2 NS mainly present a layered morphology from micrometer to nanometer sized surface area. Detailed analysis of the product also proves the existence of inorganic polyhedral fullerene-like 3D MoS 2 NS generated by pulsed laser ablation in methanol. The possible factors which may lead to formation of both 2D and 3D MoS 2 NS in methanol are examined by ab initio calculations and shown to correlate with vacancy formation. The hexagonal crystalline structure of MoS 2 NS was determined by XRD analysis. In Raman spectroscopy, the peaks at 380.33 and 405.79 cm −1 corresponding to the E 1 2g and A 1g phonon modes of MoS 2 were clearly observed. The colloidal MoS 2 NS solution presents broadband absorption edge tailoring from the UV region to the NIR region. Investigations of MoS 2 NS show that the one-step physical process of pulsed laser ablation−bulk MoS 2 powder interaction in organic solution opens doors to the formation of "two scaled" micrometer-and nanometer-sized layered and fullerene-like morphology MoS 2 structures.

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Preparation and Photocatalytic Behavior of MoS₂ and WS₂ Nanocluster Sensitized TiO₂

Cited by 532 publications

References 56 publications

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

Sonochemical synthesis and characterization of magnetic separable Fe₃O₄–TiO₂nanocomposites and their catalytic properties

Synthesis of Colloidal 2D/3D MoS₂ Nanostructures by Pulsed Laser Ablation in an Organic Liquid Environment

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Preparation and Photocatalytic Behavior of MoS2 and WS2 Nanocluster Sensitized TiO2

Cited by 532 publications

References 56 publications

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

Sonochemical synthesis and characterization of magnetic separable Fe3O4–TiO2nanocomposites and their catalytic properties

Synthesis of Colloidal 2D/3D MoS2 Nanostructures by Pulsed Laser Ablation in an Organic Liquid Environment

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Product

Resources

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Preparation and Photocatalytic Behavior of MoS₂ and WS₂ Nanocluster Sensitized TiO₂

Sonochemical synthesis and characterization of magnetic separable Fe₃O₄–TiO₂nanocomposites and their catalytic properties

Synthesis of Colloidal 2D/3D MoS₂ Nanostructures by Pulsed Laser Ablation in an Organic Liquid Environment