High efficiency Hg(II) electrochemical detection based on the number of defect engineering on MoS: Insight in synergistic action of sulfur vacancies and undercoordinated Mo.

Defects on nanomaterials can effectively enhance the performance of electrochemical detection, but an excessive number of defects may have an adverse effect. In this study, MoS nanosheets were synthesized using a hydrothermal synthesis method. By controlling the calcination temperature, MoS-7H, calcined at 700 °C under H/Ar, exhibited an optimal ratio of "point" defects to "plane" defects, resulting in excellent detection performance for mercury ions (Hg(II)).