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 π-π 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⁺detection with wide linear range (1.0–300 μg/L) and low detection limit (0.15 μg/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.

复合材料的合成方法可以定制单个材料的特性，使复合材料具有比单个材料更优越的性能。在此，通过结合石墨氮化碳（gC ₃ N ₄）中的–NH ₂基团和简便的电解路线，成功制备了gC ₃ N _{4 -}桥接还原氧化石墨烯纳米复合材料（gC ₃ N ₄ /r-GO）以构建化学结构。用于检测 Pb ^{2+ 的}传感器。由于gC ₃ N ₄含有大量的-NH ₂基团，共价键作为GO和gC ₃ N ₄之间的桥梁可以通过连续电解成功形成，同时诱导去除 r-GO 中的吸电子基团。与传统的π-π堆叠相比，这种桥可以缩短GO和gC ₃ N ₄之间的平面距离，提高r-GO和gC ₃ N ₄的电化学性能。此外，gC ₃ N ₄ /r-GO的上述独特化学结构不仅表现出优异的导电性，而且还提供了大量的活性位点从溶液中螯合Pb ²⁺。因此，制备的 gC ₃ N ₄ /r-GO 确保了 Pb ^{2+ 的}化学传感器具有宽线性范围 (1.0–300 μg/L) 和低检测限（S / N = 3 时为 0.15 μg/L ）的检测。这种简单的方法也可以扩展到制备其他含有元素的纳米材料功能化氧化物石墨烯，以改善其性能并扩大其潜在应用。