Interfacial charge-regulated AuCu Janus heterostructures for ultrasensitive electrochemical voltametric detection of triphenyltin

Triphenyltin (TPT) is a highly toxic organotin pollutant with significant bioaccumulation potential. The rapid and sensitive determination of TPT in aqueous environment remains challenging. Herein, Au Cu Janus heterostructures were prepared via a seed-mediated strategy to construct the electrochemical sensor for TPT detection. The as-prepared sensor demonstrates excellent analytical performance with a linear range of 1–30 μgL −1 and a low detection limit of 0.09 μgL −1 . The enhanced sensing performance is mainly attributed to the interfacial charge polarization and built-in electric field at the Janus hetero-interface, which effectively promotes TPT enrichment and enhances electron transfer kinetics. Furthermore, the as-prepared sensor exhibits robust anti-interference ability and achieves satisfactory recoveries (97.8–106.7%) toward spiked TPT in lake water samples. Overall, this work not only provides a highly sensitive platform for trace TPT monitoring but also offers a novel strategy for designing efficient interfacial catalytic systems.