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. 2016 Jan 14;6:19476. doi: 10.1038/srep19476

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(a) Optical image of CVD WS₂ with varying layer numbers. (b) Peak intensity map of 2LA(M) + E’/E_g/E¹_2g (~352 cm⁻¹). (c) Raman spectra of 1, 2, 3, and >3L WS₂ in the high-frequency region. (d) Peak intensity map of max A’₁/A_1g peak (~417 cm⁻¹). (e) Peak intensity map of low-frequency resonance mode at 27 cm⁻¹ in WS₂. (f) Raman spectra of 1, 2, 3, and 4L WS₂ in the low-frequency region.