Fabrication of Selective and Sensitive Hydrazine Sensor Using Sol-Gel Synthesized MoSe₂ as Efficient Electrode Modifier

Abstract

Due to its hazardous nature, the determination of hydrazine is of great significance. This study designed and fabricated a hydrazine electrochemical sensor. Two-dimensional (2-D) molybdenum diselenide (MoSe2) has been synthesized by using the sol-gel method. The phase purity and formation of MoSe2 was determined by a powder X-ray diffractometer. The surface morphological characteristics of the MoSe2 were studied by scanning electron microscopy. The presence of Mo and Se elements in the synthesized MoSe2 was checked by energy dispersive X-ray spectroscopy. The glassy carbon (GC) electrode (3 mm) was modified with the prepared MoSe2 via a drop-cast approach. This MoSe2-glassy carbon (MoSe2-GC) electrode was used as the working electrode for the hydrazine sensing application. The electrochemical sensing properties of the fabricated MoSe2-GC were analyzed by linear sweep voltammetry and cyclic voltammetry. The MoSe2-GC has shown a sensitivity of 0.68 µA/µMcm2 and a detection limit of 0.091 µM. In addition, MoSe2-GC also has good selectivity toward hydrazine determination in the presence of various interfering compounds. The excellent electro-catalytic behavior of MoSe2 is solely responsible for this enhanced sensing performance of MoSe2-GC.

Keywords

• MoSe₂
• hydrazine sensor
• cyclic voltammetry
• linear sweep voltammetry