Electrocatalytic Oxidation and Determination of Hydrazine at an AuCu Nanoparticles - Graphene - Ionic Liquid Composite Film Coated Glassy Carbon Electrode

Well-defined gold nanoparticle@N-doped porous carbon prepared from metal nanoparticle@metal–organic frameworks for electrochemical sensing of hydrazine

Schematic diagram of the preparation of Au@NPC and its application to the determination of hydrazine.

Nanorod-constructed porous Co3O4 nanowires: highly sensitive sensors for the detection of hydrazine

Porous Co₃O₄ nanowires (NWs) constructed from interconnected nanorod units were synthesized, and exhibited a highly sensitive, reliable, and reproducible sensing performance for hydrazine detection.

Gold nanoparticle-modified graphite pencil electrode for the high-sensitivity detection of hydrazine

A novel gold nanoparticle-modified graphite pencil electrode (AuNP-GPE) is prepared just by immersing a bare GPE in AuNP solution, followed by heating for 15 min. The bare and modified GPEs are characterized by FE-SEM imaging and cyclic voltammetry. The AuNP-GPEs showed excellent electrocatalytic activities with respect to hydrazine oxidation, with good reproducibility. To reduce the quantification and detection limits, and increase the hydrazine sensitivity, the pH and square wave voltammetry parameters are optimized. A square wave voltammetry study as a function of the hydrazine concentration showed that the AuNP-GPE detector's quantification limit was 100 nmol L(-1) hydrazine, much lower than the value obtained using amperometry (10 µmol L(-1)). The limits of detection (at 3σ) for hydrazine sensing at AuNP-GPEs using square wave voltammetry and amperometry were 42 nmol L(-1) and 3.07 µmol L(-1). Finally, the modified electrode was used to determine the hydrazine concentration in drinking water, and satisfactory results are obtained. This simple, rapid, low-cost method for fabricating a modified electrode is an attractive approach to the development of new sensors.