A novel electrochemical nitrite (NaNO₂) sensor is fabricated by combining Fe₂O₃ with protonated carbon nitride (HC₃N₄) and reduced graphene oxide (rGO). The smaller HC₃N₄ is distributed uniformly on the surface of the rGO support and acts as a nucleation site for the growth of Fe₂O₃. Conductive HC₃N₄ is a nano-bridge to connect and uniformly distribute Fe₂O₃, a catalytic center, to the support rGO to enhance the electrocatalytic performance. The Fe₂O₃/HC₃N₄/rGO electrode possesses high sensitivity of 0.04874 μA μM⁻¹, wide linear response range spanning 25 nM to 3000 μM, a low detection limit of 18.55 nM (S/N = 3) and shows high selectivity for nitrite in the presence of common organic and inorganic interfering species (like NaCl, MgSO₄, KNO₃, ZnSO₄, CaCl₂, glucose, urea), fulfilling requirements for a nitrite sensor used in commercial applications.

通过将Fe ₂ O ₃与质子化的氮化碳（H C ₃ N ₄）和还原的氧化石墨烯（rGO）结合，制得了新型的电化学亚硝酸盐（NaNO ₂）传感器。较小的H C ₃ N ₄均匀分布在rGO载体的表面上，并充当Fe ₂ O ₃生长的成核位点。导电性H C ₃ N ₄是一个纳米桥，用于连接并均匀分布催化中心Fe ₂ O ₃到载体rGO上，以增强电催化性能。铁₂O ₃ / H C ₃ N ₄ / rGO电极灵敏度高，为0.04874μAμM ^-1，线性响应范围宽，范围为25 nM至3000μM，检测限低，为18.55 nM（S / N = 3），显示出高选择性在常见的有机和无机干扰物质（如NaCl，MgSO ₄，KNO ₃，ZnSO ₄，CaCl ₂，葡萄糖，尿素）存在下，亚硝酸盐满足工业应用中亚硝酸盐传感器的要求。