Graphite-Incorporated MoS₂ Nanotubes:  A New Coaxial Binary System

Abstract

Graphite-filled MoS2 nanotubes were synthesized by pyrolizing propylene inside MoS2 nanotubes prepared by a template-assisted technique. The large coaxial nanotubes were constituted of graphite sheets inserted between the MoS2 layers, forming the outer part, and coaxial multiwall carbon nanotubes intercalated with MoS2 inside. High-resolution electron microscopy (HREM) and electron energy loss spectroscopy techniques along with molecular dynamics simulation and quantum mechanical calculations were used to characterize the samples. The one-dimensional structures exhibit diverse morphologies such as long straight and twisted nanotubes with several structural irregularities. The interplanar spacing between the MoS2 layers was found to increase from 6.3 to 7.4 A due to intercalation with carbon. Simulated HREM images revealed the presence of mechanical strains in the carbon-intercalated MoS2 layers as the reason for obtaining these twisted nanostructures. The mechanism of formation of carbon-intercalated MoS2 tubular structures and their stability and electronic properties are discussed. Our results open up the possibility of using MoS2 nanotubes as templates for the synthesis of new one-dimensional binary-phase systems.

MoS2/TiO2 Edge‐On Heterostructure for Efficient Photocatalytic Hydrogen Evolution

“…Electron energy loss spectrum (EELS) of the interface is shown in Figure 4c, revealing the characteristic peaks of Mo at 35 eV (M 3 -edge), S at 165 eV (L 2,3 -edge), Ti at 460 eV (L 2 L 3 -edge), and O at 532 eV. [27][28][29] Elemental mapping results of Ti, S, and Mo (the inset in Figure 4c) show the distribution of each element. The separation of Ti distribution area from Mo and S further proves that the MoS 2 does stand rather than coat on TiO 2 surface with little interfacial diffusion.…”

“…However, the clear atomic bonding of the interface between MoS 2 and TiO 2 is not resolved on account of the thickness of TiO 2 . Electron energy loss spectrum (EELS) of the interface is shown in Figure c, revealing the characteristic peaks of Mo at 35 eV (M 3 ‐edge), S at 165 eV (L 2,3 ‐edge), Ti at 460 eV (L 2 L 3 ‐edge), and O at 532 eV . Elemental mapping results of Ti, S, and Mo (the inset in Figure c) show the distribution of each element.…”

Large‐Area Vapor‐Phase Growth and Characterization of MoS2 Atomic Layers on a SiO2 Substrate

“…The EELS spectrum obtained from the location, indicated by the red dot in Fig. 2i, reveals the characteristic peaks of Mo at 35 eV (N-edge) and S at 165 eV (L-edge) 13 . The ratio of Mo and S is about 1:2, which is confirmed by the XPS data (see Supplementary…”

Electronic and transport properties of PSi@MoS2 nanocables

“…by using lasers or electron beams, or by thermal evaporation and condensation was outlined. [42][43][44][45][46] In addition, Fe 3 O 4 nanoparticles, 47 CNTs, 48,49 fullerene-like MoS 2 pods, [50][51][52] and Li and Mg ions 53 were also successfully encapsulated inside MoS 2 NTs. Molecular dynamic simulations suggest that encapsulating of MoS 2 NTs with PbI 2 obeys the Lucas-Washburn equation whereas filling of CNTs follows a modified expression.…”