Second-order Raman scattering in diamond up to 1900 K

Temperature dependence of Raman responses of few-layer PtS2

Platinum disulfide (PtS₂) is a newly emerging 2D material, which possesses relatively high carrier mobility, a widely tunable band gap from 0.25 to 1.6 eV, and ultra-high air stability, showing a potential in electronics and optoelectronics. Here, for the first time, we study the temperature-dependent Raman spectra on PtS₂ with different thicknesses. It was found that with the temperature increase from 80 to 298 K, the [Formula: see text] and [Formula: see text] modes of all samples show linear softening. Moreover, the linear softening with temperature of PtS₂ is much smaller than other 2D transition metal dichalcogenides, which could be attributed to the stronger interlayer coupling in PtS₂. Our work gives fundamental temperature-dependent vibrational information of PtS₂, which will be useful in future PtS₂-based electronic devices.