Superconducting tantalum disulfide nanotapes; growth, structure and stoichiometry

Abstract

Superconducting tantalum disulfide nanowires have been synthesised by Surface Assisted Chemical Vapour Transport (SACVT) methods and their crystal structure, morphology and stoichiometry studied by powder X-ray diffraction (PXD), scanning electron microscopy / energy 10 dispersive X-ray spectroscopy (SEM, EDX), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and nanodiffraction. The evolution of morphology, stoichiometry and structure of materials grown by SACVT methods in the Ta-S system with reaction temperature was investigated systematically. High aspect ratio, superconducting disulfide nanowires are produced at intermediate reaction temperatures (650 °C

Interlayer-glide-driven isosymmetric phase transition in compressed In2Se3

“…[26][27][28] But the remarkable difference is that the I-II isosymmetric transition in In 2 Se 3 leaves crystal symmetry unaffected, whereas the polytypic transitions in SiC and TaS 2 result in the change of space group.…”

Control of ZnO Nanostructures via Vapor Transport

“…Previously, it has been demonstrated that the use of a pinched tube can significantly enhance the yield of nanofibrous products grown using chemical vapor transport reactions,22, 23 indicating that the flow dynamics within such a system play an important role in the formation of these nanostructures. We therefore considered how this approach could be implemented for the controlled growth of ZnO nanostructures, and how specific parameters affect the formation and resultant morphology of the final products.…”

“…and has since been adopted as a reliable method by a number of other groups 12, 13. In other work, modification of the reaction tube by creation of a pinch or constriction between the solid precursors and the substrates has been shown to aid the morphological tuning of products, and their yields, for a number of different materials including TaS 2 nanowires, ribbons, and belts 22, 23. To the best of our knowledge, the combination of the inner tube “pinch” restriction and the double tube set‐up for the synthesis of ZnO nanostructures is unique, and thus we report here a new, modified quartz‐tube design in a horizontal, double‐tube, deposition system.…”

Enhanced detection of nanostructures by scanning electron microscopy using insulating materials

“…Nanostructures like carbon nanotubes or semiconducting quantum dots have already been developed for use in a wide variety of applications (Derycke et al, 2001;Dunnill et al, 2009;Martel et al, 1998;Michalet et al, 2005;Tans et al, 1997). As part of the development of these materials, it is important to develop new techniques for their assessment.…”