Abstract
Constructing a novel enzyme-free electrode for sensitive and selective detection of hydrazine (N2H4) in neutral medium is important. In this paper, Copper sulfide (CuS) with different morphologies were synthesized for electrochemical sensing of N2H4. A facile hydrothermal approach is developed for the shape-controlled synthesis of CuS architectures. The effects of reaction temperature, time, solvent and anion type on the morphologies of CuS were studied and it was found that CuS with flower-like, nanoparticle-like, rod-like and multilayered-like morphologies could be selectively prepared by just changing the type of metal precursor. The electrochemical performances of various CuS structures were investigated, which showed that flower-like CuS exhibited higher electrocatalytic activity toward N2H4 oxidation and could offer superior analytical performances with a wide linear range of 0.5 μM to 4.775 mM, a high sensitivity of 359.3 μA mM−1 cm−2 and a low detection limit of 0.097 μM (S/N = 3). Moreover, the application of the sensor for detecting N2H4 in tap water samples was demonstrated and the good recovery obtained made it a great potential for practical use.
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