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(a) Raman spectra of MWCNTs and uMWCNTs. (b) X-ray diffraction pattern of MWCNTs and uMWCNTs. (c) UV-Vis spectra of MWCNTs, uMWCNTs, Eu complex (ETP), ETP-MWCNTs and ETP-uCNTs. (d) XPS total spectrum of MWCNTs, uMWCNTs, ETP-MWCNTs and ETP-uCNTs. XPS fine spectra of O 1s of the (e) MWCNTs, (f) ETP-uCNTs.
