Fig. 4
From: Two-dimensional metallic tantalum disulfide as a hydrogen evolution catalyst
Temperature-dependent Raman characterization of 2H-TaS2 flakes with different thicknesses. a Temperature-dependent Raman spectra of ~20 nm-thick 2H-TaS2 captured from both cooling and warming processes. b, c Raman frequency plots of discernible peaks for ~20 nm-thick and ~150 nm-thick 2H-TaS2 flakes with decreasing/increasing temperature, respectively. d Hysteresis (upper) and average transition temperature (lower) plotted as a function of sample thickness. e Thickness-temperature phase diagram of CVD-derived 2H-TaS2 obtained from temperature-dependent Raman data. The red balls mark the boundary of NCCDW and CCDW phases. For simplicity, the phase boundary was recorded based on the cooling data
