The thermal conductivity of layered metal chalcogenides such as MT2 (M = Mo, W; T = S, Se) shows a marked decrease after exfoliation and subsequent restacking process. Random stacking of two-dimensional crystalline sheets circumvents thermal conduction pathways along a longitudinal direction, which results in a reduction in thermal conductivity. WS2 and WSe2 compounds retain p-type conducting behavior after exfoliation and restacking with decreased electrical conductivity due to the change in carrier concentration. MoSe2 compound exhibits metallic behavior < 130 o C with a small Seebeck coefficient, which results from metastable 1T-MoSe2 structure of the restacked phase.
Carbon nanotubes have been synthesized by heat treating the polymer at 400 °C in air which was obtained by polyesterification between citric acid and ethylene glycol. Transmission electron micrographs and an electron diffraction pattern showed the formation of carbon nanotubes. The diameter of the tubes ranged from 5 to 20 nm, whereas the lengths were less than 1 μm.
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