CuS/Prussian blue core–shell nanohybrid as an electrochemical sensor for ascorbic acid detection

Abstracts An electrochemical sensor based on core–shell nanostructured copper sulfide@Prussian blue composites (CuS@PB) was investigated for ascorbic acid (AA) detection. CuS nanoparticles (NPs) were prepared by a hydrothermal method, then core–shell CuS@PB nanohybrid was fabricated through in situ synthesis of PB on CuS NPs. Taking advantage of their enhanced properties, a novel electrochemical AA sensor was developed by drop-coating of CuS@PB nanohybrid on glassy carbon electrode (GCE). As expected, electrochemical observations showed that CuS@PB/GCE presented higher electrocatalytic performance of AA than PB/GCE, with a wide linear range (5–3875 μ M, R = 0.9997), fast response time (<3 s), high sensitivity (256.91 μ AmM −1 cm −2 ), as well as a low limit of detection (0.24 μ M at a signal-to-noise ratio of 3). Additionally, the CuS@PB/GCE showed excellent reproducibility, storage stability, anti-interference, and selectivity. The application of a CuS@PB/GCE sensor for an AA assay in beverage samples achieved satisfactory results, demonstrating great prospects for the quantitative detection of AA in various fields.