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

• Published in: Nanotechnology Vol. 30; no. 32; p. 325501
• Main Authors: Li, Lihuang, Zhang, Peng, Li, Ziyang, Li, Danyang, Han, Bin, Tu, Li, Li, Bo, Wang, Yange, Ren, Lei, Yang, Peiyan, Ke, Sunkui, Ye, Shefang, Shi, Wei
• Format: Journal Article
• Language: English
• Published: England IOP Publishing 09.08.2019
• Subjects: amperometric; ascorbic acid; Ascorbic Acid - analysis; Beverages - analysis; Carbon - chemistry; Copper - chemistry; copper sulfide; electrochemical sensor; Electrochemical Techniques - methods; Electrodes; Ferrocyanides - chemistry; Limit of Detection; Nanostructures - chemistry; Prussian blue; Signal-To-Noise Ratio
• ISSN: 0957-4484; 1361-6528
• DOI: 10.1088/1361-6528/ab1613

s 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 M, R = 0.9997), fast response time (<3 s), high sensitivity (256.91 AmM−1cm−2), as well as a low limit of detection (0.24 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.