Figure 2

(a–c) Raman spectra of as-sputtered and annealed MoS₂ films; (d) Raman spectra of MoS₂ films annealed at different times of 30 min, 1 hour, 2 hours and 3 hours; (e) Magnified view of Raman spectra of figure (d); (f–h) Raman mapping for 1-min sample (30 μm × 30 μm). (f) E_2g¹ mode appears at 384.82–384.92 cm⁻¹ (with a standard deviation 0.048 cm⁻¹) (g) A_1g mode appears at 405.19–405.29 cm⁻¹ (with a standard deviation 0.049 cm⁻¹) (h) The measured frequencies difference (∆k) is in the range of 20.27–20.47 cm⁻¹ (with a standard deviation 0.066 cm⁻¹).