Fabrication of Zn-MOF@rGO based sensitive nanosensor for the real time monitoring of hydrazine

Abstract

In the present study, a porous Zn-MOF@rGO (Zinc-Metal organic frameworks and reduced graphene oxide) was prepared via solvothermal technique and utilized for the amperometric determination of hydrazine. Zn-MOF@rGO solution was used to modify gold electrode (AuE) for the superior electrocatalytic oxidation of hydrazine in real water sample. The synthesized material was analyzed using XRD, TEM, FTIR, TGA and BET techniques. TEM studies revealed prismatic shape of Zn-MOF with size ranging between 160 and 180 nm and were well dispersed on the rGO sheets. Also, the incorporation of Zn-MOF into rGO leads to the significant improvement in the performance which can be ascribed to the large surface area, excellent adsorption affinity, chemical stability and high electrical conductivity. This is the first report on the use of Zn-MOF@rGO for the detection of hydrazine. The hydrazine sensor using Zn-MOF@rGO as electrocatalyst displayed a low LOD (8.7 × 10−3 μM), high sensitivity (5.4 × 10−2 μA μM−1 cm−2) and a fast response time (<2s). Moreover, the sensor possessed excellent anti-interference property and reproducibility. Zn-MOF@rGO nanostructures confirmed its great improvement in the electrochemical performance and their realistic applications in sensing devices.