▎ 摘　　要

Synthesis methods of composites materials can tailor individual materials properties and make the composite possess more superior performance than individual materials. Herein, by combining -NH2 group in graphitic carbon nitride (g-C3N4) and a facile electrolytic route, g-C3N4-bridging reduced graphene oxide nanocomposite (g-C3N4/r-GO) was successfully prepared to construct chemical sensor for detection of Pb2+. Because g-C3N4 contains a large amount of -NH2 group, covalent bonds as bridges between GO and g-C3N4 could be successfully formed by successively electrolyzing, which simultaneously induced removal of electron withdrawing group in r-GO. Such bridges could shorten the planar distance between GO and g-C3N4 in comparison with the conventional pi-pi stacking, improving the electrochemical performance of r-GO and g-C3N4. Moreover, the above unique chemical structure of g-C3N4/r-GO not only exhibited excellent electrical conductivity but also provided plenty active sites to chelate Pb2+ from solution. Therefore, the prepared g-C3N4/r-GO ensured chemical sensor for Pb2+ cletection with wide linear range (1.0-300 mu g/L) and low detection limit (0.15 mu g/L at S/N = 3). This simple method could also be extended to preparation of other elements-contained nanomaterials functionalized oxide graphene for improve its properties and widen its potential applications.