Growth of WS2 Nanotubes Phases.
TL;DR: In this paper, a detailed study of the growth mechanism of WS2 nanotubes has been undertaken, which is reported hereby, and a series of experiments were conducted to define the key parameters, which determine the shape of the WS2 Nanotubes.
Abstract: Recently, a method to produce bulk quantities of pure multiwall WS2 nanotubes, which could reach several microns in length, has been developed. A detailed study of the growth mechanism of these WS2 nanotubes has been undertaken, which is reported hereby. A series of experiments were conducted to define the key parameters, which determine the shape of the WS2 nanotubes. An alternative approach for the synthesis of WS2 nanotubes, starting from long WO3-x nanowhiskers, which can be extended for the synthesis of other nanotubes, is described as well.
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TL;DR: This work aims to prepare graphene-like MoS2 and WS2, which are quasi-two-dimensional compounds in which the atoms within the layer are held together by strong covalent forces while van der Waals interaction enables stacking of the layers.
Abstract: Inorganic sheets: Graphene-like MoS2 and WS2 were prepared by three different chemical methods. Examination by microscopic techniques revealed that they consist of one or a few layers (see depicted TEM image of WS2 layers), and an atomic-resolution TEM image showed that layered MoS2 has a hexagonal arrangement of Mo and S atoms (see inset).
1,541 citations
TL;DR: In this article, the authors provide an overview of recent research and significant advances reported in the literature, covering from synthesis to properties and to applications especially in energy conversion and storage, such as lithium-ion batteries, solar cells, fuel cells and piezoelectric nanogenerators.
Abstract: Metal sulfide nanomaterials have attracted great attention because of their excellent properties and promising applications in electronic, optical and optoelectronic devices. Well-aligned nanostructure arrays on substrates are highly attractive for their enhanced properties and novel applications. The general solution route and thermal evaporation under controlled conditions have been utilized for oriented growth of various metal sulfide nanostructure arrays and demonstrated their applications in energy conversion and storage. The article provides an overview of recent research and significant advances reported in the literature, covering from synthesis to properties and to applications especially in energy conversion and storage, such as lithium-ion batteries, solar cells, fuel cells and piezoelectric nanogenerators.
546 citations
TL;DR: The polar surface-dominated ZnO nanobelts are likely to be an ideal system for understanding piezoelectricity and polarization-induced ferroelectricity at nano-scale and they could have applications as one-dimensional nano- scale sensors, transducers, and resonators.
Abstract: Nanobelt is a quasi-one-dimensional structurally controlled nanomaterial that has well-defined chemical composition, crystallographic structure, and surfaces (e.g., growth direction, top/bottom surface, and side surfaces). This article reviews the nanobelt family of functional oxides, including ZnO, SnO2, In2O3, Ga2O3, CdO, and PbO2 and the relevant hierarchical and complex nanorods and nanowires that have been synthesized by a solid-vapor process. The nanobelts are single crystalline and dislocation free, and their surfaces are atomically flat. The oxides are semiconductors that have been used for fabrication of nanosize functional devices of key importance for nanosystems and biotechnology, such as field-effect transistors, gas sensors, nanoresonators, and nanocantilevers. The structurally controlled ZnO nanobelts that exhibit piezoelectric properties are also reviewed. By controlling growth kinetics, we show the success of growing nanobelt-based novel structures whose surfaces are dominated by the polarized +-(0001) facets. Owing to the positive and negative ionic charges on the zinc- and oxygen-terminated +-(0001) surfaces, respectively, a spontaneous polarization is induced across the nanobelt thickness. As a result, helical nanostructures and nanorings are formed by rolling up single-crystal nanobelts; this phenomenon is a consequence of minimizing the total energy contributed by spontaneous polarization and elasticity. The polar surface-dominated ZnO nanobelts are likely to be an ideal system for understanding piezoelectricity and polarization-induced ferroelectricity at nano-scale and they could have applications as one-dimensional nano-scale sensors, transducers, and resonators.
440 citations
Pennsylvania State University1, Oak Ridge National Laboratory2, Lawrence Berkeley National Laboratory3, Stanford University4, University of Pittsburgh5, Columbia University6, University of Regensburg7, University of Kansas8, University of Virginia9, University of Arizona10, University of Pennsylvania11, Lehigh University12, University of Chicago13, Rutgers University14, University of California, Berkeley15, Northwestern University16
TL;DR: Lin et al. as mentioned in this paper reviewed the most recent breakthrough discoveries as well as emerging opportunities and remaining challenges in the field of 2D materials, including transition metal dichalcogenides, mono-elemental 2D sheets, and several carbide-and nitride-based materials.
Abstract: Author(s): Lin, Z; McCreary, A; Briggs, N; Subramanian, S; Zhang, K; Sun, Y; Li, X; Borys, NJ; Yuan, H; Fullerton-Shirey, SK; Chernikov, A; Zhao, H; McDonnell, S; Lindenberg, AM; Xiao, K; Le Roy, BJ; Drndic, M; Hwang, JCM; Park, J; Chhowalla, M; Schaak, RE; Javey, A; Hersam, MC; Robinson, J; Terrones, M | Abstract: The rise of two-dimensional (2D) materials research took place following the isolation of graphene in 2004. These new 2D materials include transition metal dichalcogenides, mono-elemental 2D sheets, and several carbide- and nitride-based materials. The number of publications related to these emerging materials has been drastically increasing over the last five years. Thus, through this comprehensive review, we aim to discuss the most recent groundbreaking discoveries as well as emerging opportunities and remaining challenges. This review starts out by delving into the improved methods of producing these new 2D materials via controlled exfoliation, metal organic chemical vapor deposition, and wet chemical means. We look into recent studies of doping as well as the optical properties of 2D materials and their heterostructures. Recent advances towards applications of these materials in 2D electronics are also reviewed, and include the tunnel MOSFET and ways to reduce the contact resistance for fabricating high-quality devices. Finally, several unique and innovative applications recently explored are discussed as well as perspectives of this exciting and fast moving field.
429 citations
TL;DR: The reaction between the carbondisulfide and hexadecylamine generates in situ hydrogendisulfides andhexadecylisothiocyanatevia N-hexadeCyldithio-carbamate as a transient species and subsequent nanosheetcrystals from tungsten oxide rods.
Abstract: nanosheetcrystalsfromthe tungsten oxide rods. The reaction between the carbondisulfide and hexadecylamine generates in situ hydrogendisulfideandhexadecylisothiocyanateviaN-hexadecyldithio-carbamate as a transient species [Eq.(1); see also Figures S1and S2 in the Supporting Information], and subsequent
309 citations
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TL;DR: In this paper, a detailed study of the growth mechanism of WS2 nanotubes has been undertaken, which is reported hereby, and a series of experiments were conducted to define the key parameters, which determine the shape of the WS2 Nanotubes.
Abstract: Recently, a method to produce bulk quantities of pure multiwall WS2 nanotubes, which could reach several microns in length, has been developed. A detailed study of the growth mechanism of these WS2 nanotubes has been undertaken, which is reported hereby. A series of experiments were conducted to define the key parameters, which determine the shape of the WS2 nanotubes. An alternative approach for the synthesis of WS2 nanotubes, starting from long WO3-x nanowhiskers, which can be extended for the synthesis of other nanotubes, is described as well.
212 citations