Thiolated poly(aspartic acid)-functionalized two-dimensional MoS(2), chitosan and bismuth film as a sensor platform for cadmium ion detection

In this work, a sensitive electrochemical platform for determination of cadmium ions (Cd(2+)) is obtained using thiolated poly(aspartic acid) (TPA)-functionalized MoS(2) as a sensor platform by differential pulse anodic stripping voltammetry (DPASV). The performance of the TPA–MoS(2)-modified sensor is systemically studied. It demonstrates that the TPA–MoS(2) nanocomposite modified sensor exhibits superior analytical performance for Cd(2+) over a linear range from 0.5 μg L(−1) to 50 μg L(−1), with a detection limit of 0.17 μg L(−1). Chitosan is able to form a continuous coating film on the surface of the GC electrode. The good sensing performance of the TPA–MoS(2)-modified sensor may be attributed to the following factors: the large surface area of MoS(2) (603 m(2) g(−1)), and the abundant thiol groups of TPA. Thus, the TPA–MoS(2)-modified sensor proves to be a reliable and environmentally friendly tool for the effective monitoring of Cd(2+) existing in aquacultural environments.