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.