Scalable synthesis of WS
                    <sub>2</sub>
                    on graphene and h-BN: an all-2D platform for light-matter transduction

Rossi, Antonio; Büch, Holger; Rienzo, Carmine Di; Mišeikis, Vaidotas; Convertino, Domenica; Al-Temimy, Ameer; Voliani, Valerio; Gemmi, Mauro; Piazza, Vincenzo; Coletti, Camilla

doi:10.1088/2053-1583/3/3/031013

Cited by 42 publications

(41 citation statements)

References 32 publications

(51 reference statements)

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“…WS2 crystals present only two different orientations related to each other by a rotation of 60°. This suggests the existence of an epitaxial relation between WS2 and graphene, which was already reported for monolayer WS2 directly grown on 2D materials [19,21,26,27].…”

Section: Ws2/graphene Scalable Heterostructuressupporting

confidence: 78%

Deterministic direct growth of WS₂ on CVD graphene arrays

et al. 2019

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The combination of the exciting properties of graphene with those of monolayer tungsten disulfide (WS2) makes this heterostack of great interest for electronic, optoelectronic and spintronic applications. The scalable synthesis of graphene/WS2 heterostructures on technologically attractive substrates like SiO2 would greatly facilitate the implementation of novel two-dimensional (2D) devices. In this work, we report the direct growth of monolayer WS2 via chemical vapor deposition (CVD) on single-crystal graphene arrays on SiO2. Remarkably, spectroscopic and microscopic characterization reveals that WS2 grows only on top of the graphene crystals so that the vertical heterostack is selectively obtained in a bottom-up fashion.Spectroscopic characterization indicates that, after WS2 synthesis, graphene undergoes compressive strain and hole doping. Tailored experiments show that such hole doping is caused by the modification of the SiO2 stoichiometry at the graphene/SiO2 interface during the WS2 growth. Electrical transport measurements reveal that the heterostructure behaves like an electron-blocking layer at large positive gate voltage, which makes it a suitable candidate for the development of unipolar optoelectronic components.

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Section: Ws2/graphene Scalable Heterostructuressupporting

confidence: 78%

Deterministic direct growth of WS₂ on CVD graphene arrays

et al. 2019

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“…At the same time, direct growth methods can provide much cleaner interfaces than those obtained in mechanical stacked samples, especially when two-step growth approaches are employed. Direct bottom-up growth methods have already been reported for the synthesis of h-BN on top of graphene 68,69 and of graphene on h-BN; [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84] of several TMDs on graphene, including MoS 2 , 69,[85][86][87][88][89][90][91][92][93][94][95][96] WS 2 , [97][98][99][100] MoSe 2 , 101 WSe 2 , 69,90,102,103 105 and of other materials such as GaSe, 106,107 nontransition metal chalcogenides [108][109][110] , single layers of metal oxides such as ZnO, 111 or perovskites 112 on graphene. Most of those methods to synthesize heterostructures have evolved along with the ...…”

Section: 57mentioning

confidence: 99%

Synthesis, structure and applications of graphene-based 2D heterostructures

2017

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With the profuse amount of two-dimensional (2D) materials discovered and the improvements in their synthesis and handling, the field of 2D heterostructures has gained increased interest in recent years. Such heterostructures not only overcome the inherent limitations of each of the materials, but also allow the realization of novel properties by their proper combination. The physical and mechanical properties of graphene mean it has a prominent place in the area of 2D heterostructures. In this review, we will discuss the evolution and current state in the synthesis and applications of graphene-based 2D heterostructures. In addition to stacked and in-plane heterostructures with other 2D materials and their potential applications, we will also cover heterostructures realized with lower dimensionality materials, along with intercalation in few-layer graphene as a special case of a heterostructure. Finally, graphene heterostructures produced using liquid phase exfoliation techniques and their applications to energy storage will be reviewed.

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“…,. While monolayer growth has been achieved using various techniques,‐ CVD grown monolayer decorated with Ag nanoparticle is not explored much with precise control over uniform thickness. While the direct use of sun light for photocatalytic bacterial disinfection might be attractive for low cost water treatment, the use of fluorescent light is more relevant for actual household applications to supply potable water.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Water Disinfection of CVD Grown WS₂ Monolayer Decorated with Ag Nanoparticles

et al. 2018

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Two dimensional nanostructures of transition metal dichalcogenides like WS2 have been drawing much attention for biological applications owing to their intrinsic chemical and optical properties with tunable band gap. We have evaluated photocatalytic properties of chemical vapor deposited (CVD) grown WS2 monolayer with a direct band gap of 1.94 eV to disinfect water from Gram‐negative E.coli bacteria under fluorescence light by colony counting method. WS2 monolayer decorated with 10‐15 nm silver nanoparticles is found to enhance the antibacterial activity in comparison with individual components significantly. We have achieved up to 96% of bacterial growth inhibition by increasing the areal coverage of WS2 (upto 42%) coated with Ag nanoparticles in 3 hours, under fluorescent light. Moreover, direct correlation between the water disinfection ability and geometrical surface areal coverage of the monolayer WS2 on SiO2/Si substrate has been established to emphasize on the need of uniform CVD growth of WS2 monolayers over large scale for practical application like rapid and efficient cleaning technology.

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Scalable synthesis of WS ₂ on graphene and h-BN: an all-2D platform for light-matter transduction

Cited by 42 publications

References 32 publications

Deterministic direct growth of WS₂ on CVD graphene arrays

Deterministic direct growth of WS₂ on CVD graphene arrays

Synthesis, structure and applications of graphene-based 2D heterostructures

Photocatalytic Water Disinfection of CVD Grown WS₂ Monolayer Decorated with Ag Nanoparticles

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Scalable synthesis of WS 2 on graphene and h-BN: an all-2D platform for light-matter transduction

Cited by 42 publications

References 32 publications

Deterministic direct growth of WS2 on CVD graphene arrays

Deterministic direct growth of WS2 on CVD graphene arrays

Synthesis, structure and applications of graphene-based 2D heterostructures

Photocatalytic Water Disinfection of CVD Grown WS2 Monolayer Decorated with Ag Nanoparticles

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Product

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Scalable synthesis of WS ₂ on graphene and h-BN: an all-2D platform for light-matter transduction

Deterministic direct growth of WS₂ on CVD graphene arrays

Deterministic direct growth of WS₂ on CVD graphene arrays

Photocatalytic Water Disinfection of CVD Grown WS₂ Monolayer Decorated with Ag Nanoparticles