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The photoluminescence (PL) quenching of water-soluble graphene oxide (GO) solution was systematically investigated in the presence of transition metal ions. Their PL spectra were analyzed by the Stern–Volmer equation, and the trend of the quenching efficiency was Fe2+>Co2+>Ni2+>Cd2+>Hg2+. The results of the steady-state and time-resolved PL spectra of the GO solution suggested that the...
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