The materials with the worst thermal conductivity (or thermal insulators) are so-called porous materials. Heat is transmitted in the state of phonons in the crystal. Therefore, if the structure of the crystal is quite regular, then the phonons can easily spread to a long distance. That is to say, it has high thermal conductivity. Conversely, if the regularity of the atomic structure of the lattice is poor, the phonons will quickly consume energy in the lattice. At this time, the thermal conductivity of the substance is naturally very poor. Studies have found that the thermal conductivity of tungsten diselenide film is worse than that of single crystal tungsten diselenide, which is only about 1/100,000 of that of diamond with the best thermal conductivity. Therefore, tungsten diselenide not only has a porous material like That thermal conductivity, and at the same time its density is very high, almost the same as metallic copper.
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