Abstract
We have studied charge density wave (CDW) in low-dimensional conductors, metal tri-chalcogenides (MX 3), and metal di-chalcogenides (MX 2). The Fröhlich superconductivity is achieved through an ideal system in the absence of pinning potential. Downsizing is a promising approach. We succeeded in synthesizing TaSe 2 nanocrystals by the de-chalcogenide method. TaSe 2 crystals were obtained by the hydrogen reduction of TaSe 3 nanofibers at a relatively low temperature (300 °C). Therefore, we propose a conversion mechanism to obtain TaSe 2 from TaSe 3 by the de-chalcogenide method. The TaSe 2 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.
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