Effects of sonochemical approach and induced contraction of core-shell bismuth sulfide/graphitic carbon nitride as an efficient electrode materials for electrocatalytic detection of antibiotic drug in foodstuffs.

Ultrasonic-enhanced surface-active bismuth trisulfide based core-shell nanomaterials were developed and used as an efficient modified electrode material to construct a highly sensitive antibiotic sensor. The core-shell BiS@GCN electrode material was directly synthesized by in-situ growth of GCN on BiS to form core-shell like nanostar (Ti-horn, 30 kHz, and 70 W/cm). The electrocatalyst of BiS@GCN nanocomposites was efficaciously broadened towards electrochemical applications. As synthesized BiS@GCN promoted the catalytic ability and electrons of GCN to transfer to BiS. The single-crystalline GCN layers were uniformly grown on the surface of the BiS nanostars. Under the optimal conditions of electrochemical analysis, the CPL sensor exhibited responses directly proportional to concentrations (toxic chemical) over a range of 0.02-374.4 μM, with a nanomolar detection limit of 1.2 nM (signal-to-noise ratio S/N = 3). In addition, the modified sensor has exhibited outstanding selectivity under high concentrations of interfering chemicals and biomolecules. The satisfactory CPL recoveries in milk product illustrated the credible real-time application of the proposed BiS@GCN sensors for real samples, indicating promising potential in food safety department and control. Additionally, the proposed electrochemical antibiotic sensor exhibited outstanding performance of anti-interfering ability, high stability and reproducibility.