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. 2019 Aug 15;14:278. doi: 10.1186/s11671-019-3119-3

Fig. 3.

Fig. 3

PL spectra of MoS2 monolayers a mechanically exfoliated flakes on SiO2/Si substrates and b CVD thin films on sapphire substrates after UV-O3 treatment for 0, 1, 3, and 5 min