Abstract
In this paper, we systematically investigated the influence of fluoride on the morphology and electrochemical property of Co3O4 nanostructures for hydrazine detection. The results showed that with the introduction of NH4F during the synthesis process of Co3O4, both Co(CO3)0.5(OH)·0.11H2O and Co(OH)F precursors would be generated. To understand the influence of F on the morphology and electrochemical property of Co3O4, three Co3O4 nanostructures that were respectively obtained from bare Co(CO3)0.5(OH)·0.11H2O, Co(OH)F and Co(CO3)0.5(OH)·0.11H2O mixtures and bare Co(OH)F were successfully synthesized. The electrochemical tests revealed the sensing performance of prepared Co3O4 nanostructures decreased with the increase in the fluoride contents of precursors. The more that dosages of NH4F were used, the higher crystallinity and smaller specific surface area of Co3O4 was gained. Among these three Co3O4 nanostructures, the Co3O4 that was obtained from bare Co(CO3)0.5(OH)·0.11H2O-based hydrazine sensor displayed the best performances, which exhibited a great sensitivity (32.42 μA·mM−1), a low detection limit (9.7 μΜ), and a wide linear range (0.010–2.380 mM), together with good selectivity, great reproducibility and longtime stability. To the best of our knowledge, it was revealed for the first time that the sensing performance of prepared Co3O4 nanostructures decreased with the increase in fluoride contents of precursors.
Highlights
Hydrazine and based chemicals are water soluble volatile colorless liquids, and the simplest unique diamine in its class has aroused wide concern for its large number of applications in many spheres, for instance, corrosive inhibitors, fuel cells and so on [1,2,3,4]
For the synthesis of Co3 O4, all these three precursors were thermally annealed at 400 ◦ C for 5 h in air
The performance of Co3 O4 -1/glassy carbon electrode (GCE) is better than Co3 O4 -2/GCE. These results reveal that the existence of F in the synthesis of Co3 O4 has a great impact on its electrochemical performance
Summary
Hydrazine and based chemicals are water soluble volatile colorless liquids, and the simplest unique diamine in its class has aroused wide concern for its large number of applications in many spheres, for instance, corrosive inhibitors, fuel cells and so on [1,2,3,4]. Hydrazine and its derivatives do great harm to the body through the digestive system along with skin permeation [5]. It is highly imperative to propose a sensitive, original and analytically credible tool for the effective detection of hydrazine. It is promising to develop electrochemical methods for hydrazine detection. Lots of semiconductor metal oxides have been used for hydrazine electrochemical sensing. Ahmad et al have fabricated a ZnO nanorods-based hydrazine sensor and showed a low detection limit [9].
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