Electrochemiluminescent sensor based on Ru(bpy)32+-doped silica nanoprobe by incorporating a new co-reactant NBD-amine for selective detection of hydrogen sulfide

摘要： Here, we fabricated a new amine compound as the co-reactant and incorporated an ECL sensor based on RuSi NPs/Nafion to improve the detection sensitivity of ECL system toward H2S by enhancing ECL intensity. The prepared sensor shows a good detection effect. In the work, water-oil microemulsion method was used to synthesize the Ru(bpy)3 2+-doped silica nanoparticles (RuSi NPs), and then mixed the RuSi NPs solution with Nafion (5 wt%) followed by modifying the mixture to the electrode. Upon treatment with H2S, the co-reactant NBD (7-nitro-1,2,3-benzoxadiazole) can release the piperazine intermediate, which can effectively improve the ECL signals of Ru(bpy)3 2+. This enhanced ECL assay for H2S detection have the following several merits: excellent sensitivity with the detection limit of 1.7 × 10 -12mol/L, good selectivity over interfering species.