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In this study,a non-enzymatic hydrogen peroxide sensor was successfully fabricated on the basis of copper sulfide nanoparticles/reduced graphene oxide(CuS/RGO) electrocatalyst.Using thiourea as reducing agent and sulfur donor,CuS/RGO hybrid was synthesized through a facile one-pot hydrothermal method,where the reduction of GO and deposition of CuS nanoparticles on RGO occur simultaneously.The results confirmed that the CuS/RGO hybrid helps to prevent the aggregation of CuS nanoparticles.Electrochemical investigation showed that the as-prepared hydrogen peroxide sensor exhibited a low detection limit of 0.18μmol/L(S/N = 3),a good reproducibility(relative standard deviation(RSD) of4.21%),a wide linear range(from 3 to 1215 μmol/L) with a sensitivity of 216.9 μA L/mmol/cm~2 under the optimal conditions.Moreover,the as-prepared sensor also showed excellent selectivity and stability for hydrogen peroxide detection.The excellent performance of CuS/RGO hybrid,especially the lower detection limit than certain enzymes and noble metal nanomaterials ever reported,makes it a promising candidate for non-enzymatic H_2O_2 sensors.
In this study, a non-enzymatic hydrogen peroxide sensor was successfully fabricated on the basis of copper sulfide nanoparticles / reduced graphene oxide (CuS / RGO) electrocatalyst. Using thiourea as reducing agent and sulfur donor, CuS / RGO hybrid was synthesized through a facile one-pot hydrothermal method, where the reduction of GO and deposition of CuS nanoparticles on RGO occurrences. the results confirmed that the CuS / RGO hybrid helps to prevent the aggregation of CuS nanoparticles. Electrochemical investigation showed that the as-prepared hydrogen peroxide sensor exhibited a low detection limit of 0.18 μmol / L (S / N = 3), a good reproducibility (relative standard deviation (RSD) of 4.21%), a wide linear range (from 3 to 1215 μmol / L) of 216.9 μA L / mmol / cm 2 under the optimal conditions. Moreover, the as-prepared sensor also showed excellent selectivity and stability for hydrogen peroxide detection. excellent performance of CuS / RGO hybrid, especially the lower detection limit than certain enzymes and noble metal nanomaterials ever reported, makes it a promising candidate for non-enzymatic H_2O_2 sensors.