Dual-mode sensing of hydrogen peroxide on self-assembled Ag nanoparticles anchored on polydopamine wrapping 2D Cu-MOFs

In this study, we have fabricated a dual-signal sensor for H2O2 determination based on 2D Cu-MOFs decorated with Ag NPs. A novel polydopamine (PDA) reduction method was utilized to reduce [Ag(NH3)(2)](+) to highly dispersed Ag NPs in situ without other reductive agents, and Cu-MOF@PDA-Ag was obtained. For the electrochemical sensor, the Cu-MOF@PDA-Ag modified electrode exhibits outstanding electrocatalytic properties toward H2O2 reduction with a high sensitivity of 103.7 & mu;A mM(-1) cm(-2), a wide linear range from 1 & mu;M to 35 mM and a low detection limit of 2.3 & mu;M (S/N = 3). Moreover, the proposed sensor shows good feasibility in an orange juice sample. For the colorimetric sensor, colorless 3,3 & PRIME;,5,5 & PRIME;-tetramethylbenzidine (TMB) can be oxidized by the Cu-MOF@PDA-Ag composite in the presence of H2O2. A Cu-MOF@PDA-Ag catalysis-based colorimetric platform is further established for the quantitative analysis of H2O2 ranging from 0 to 1 mM with a lower detection limit of 0.5 nM. Importantly, such a dual-signal method for the detection of H2O2 could potentially have wide practical applications.

Automated summary

In this study, a dual-signal sensor for H2O2 determination was fabricated using 2D Cu-MOFs decorated with Ag NPs. A novel polydopamine reduction method was employed to reduce [Ag(NH3)(2)](+) to highly dispersed Ag NPs in situ without other reductive agents, resulting in Cu-MOF@PDA-Ag. The sensor exhibited excellent electrocatalytic properties and a colorimetric platform for the detection of H2O2.