Abstract
The design and construction of an efficient electrochemical hydrazine sensor is of great significance for food quality and safety detection. Herein, a novel three-dimensional (3D) hexagonal star-like carbon nanotubes modified N-doped graphitized carbon encapsulated CoS2 nanocomposites (CoS2 @NC/CNTs) was prepared using cobalt and zinc zeolitic imidazolate frameworks (CoZn-ZIF) as a precursor. The "tip effect" of the hexagonal star-like structure facilitates electron transfer and mass transfer. Carbon nanotube-modified N-doped graphitized carbon substrates (NC/CNTs) avoid agglomeration of CoS2 nanoparticles and have excellent electrical conductivity and abundant active sites. The above synergistic effects enable the CoS2 @NC/CNTs-based hydrazine electrochemical sensors to exhibit enhanced electrocatalytic activity compared to the conventional 3D ZIF-derived dodecahedral CoS2 @NC. As an electrochemical hydrazine sensor, CoS2 @NC/CNTs can provide a wide linear range of 1.0 μM - 6.0 mM, an excellent sensitivity of 2101 μA mM−1 cm −2, a detection limit as low as 96 nM (S/N = 3), a satisfactory stability and a promising selectivity. In addition, the sensor displays encouraging performance in the detection of hydrazine in biological and food samples, which lights up a new field for the application of such catalysts in electrochemical sensing.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call