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(A) XPS survey spectra of CNT (carbon nanotube), CNA (CNT after acid treatment), CNA(ox) (CNA submitted to oxidative environment), CNANgn (CNA treated with naringenin) and CNANgn(ox) (CNA treated with naringenin in oxidative environment). (B) The binding energy of C1s spectra. (C) The binding energy of O1s spectra.
