Hydrothermal synthesis of molybdenum disulfide (MoS₂) nanosheets for electrochemical sensing of hydrazine

Abstract

Recently, fabrication of hydrazine sensors electrochemical sensors have received extensive attentions due to their cost-effectiveness, simplicity, high sensitivity and selectivity. Herein, we reported the hydrothermal formation of molybdenum disulphide (MoS₂) using ammonium molybdenum tetra hydrate and L-cysteine as Mo and S-source, respectively. The MoS₂ was characterised by employing SEM, EDX and XRD techniques. The MoS₂ was deposited on to the glassy carbon i.e. GC electrode by simple drop-caste approach. The MoS₂ based GC electrode was adopted as hydrazine sensor. Cyclic voltammetry and differential pulse voltammetry (CV and DPV) have been used for the electrochemical characterisation of MoS₂ modified GC electrode. The CV and DPV studies showed that MoS₂ modified GC electrode has higher electrochemical properties compared to the bare GC electrode. The MoS₂ modified GC electrode exhibited detection limit of 0.54 µM with sensitivity of 3.2 µA µM⁻¹.cm⁻² and dynamic linear range of 1 to 10 µM. The MoS₂ modified GC electrode also demonstrated acceptable results for reproducibility, and selectivity. We believe that MoS₂ modified GC electrode may explored for the construction of hydrazine electrochemical sensing devices.