▎ 摘　　要

This communication clearly highlights the importance and necessity for a comparison investigation between nitrogen-doped graphene (N-G) and graphene as a two-dimensional mat of metal nanoparticles (NPs). We presented Ag NPs as a model of metal NPs for fabricating Ag/N-G and Ag/graphene nanocomposites, respectively. Compared with Ag/graphene nanocomposites, the Ag/N-G nanocomposites could facilitate the electrochemical redox process of S2O82-, and showed improved electrochemiluminescence (ECL) performances including increasing similar to 2.25-fold ECL intensity and decreasing similar to 330 mV onset potential of S2O82-, respectively. Further, the as-prepared pentachlorophenol ECL sensor based on Ag/N-G nanocomposites showed a wider linear range and lower detection limit than those of the Ag/graphene nanocomposites. This study could be potentially useful for understanding the role of N-G in electrochemistry, and opening a new aspect for exploring and developing potential application of N-G based materials in electrocatalysis and sensing fields. (C) 2014 Elsevier B.V. All rights reserved.