Synthesizing nanocrystals of metal di-chalcogenide charge density wave system

We have studied charge density wave (CDW) in low-dimensional conductors, metal tri-chalcogenides (MX3), and metal di-chalcogenides (MX2). The Fröhlich superconductivity is achieved through an ideal system in the absence of pinning potential. Downsizing is a promising approach. We succeeded in synthesizing TaSe2 nanocrystals by the de-chalcogenide method. TaSe2 crystals were obtained by the hydrogen reduction of TaSe3 nanofibers at a relatively low temperature (300 °C). Therefore, we propose a conversion mechanism to obtain TaSe2 from TaSe3 by the de-chalcogenide method. The TaSe2 nanocrystals thus obtained were investigated by transmission electron microscopy and electron diffraction, and new CDW phases (26.21×26.21,7×7, and 2 × 2 superlattices) were discovered.