Ambient plasma treatment on MoS2 created additional oxygen functional group as well as phase transformation from 2H to 1T. I got the Raman peak a 1T behavior with additional J2, J2, J3 peaks after plasma treatment. And also the intensity of E1 2g and A1g is huge decreased, and blue shifted. What is the explanation of the blue shift in this condition? Can electronegativity of doped element effect in Raman shift?

Thanks in advance.

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