N-doped graphene (NG) has been prepared by annealing reduced graphene oxide (RGO) in ammonia in atmosphere and in vacuum, respectively. The photoluminescence properties of RGO and NG have been examined systematically. The results showed that doping RGO with N can quench its fluorescence, and the fluorescence quenching of NG obtained in vacuum is more efficient than that prepared in atmosphere. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4726040]
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