Preparation of nickel nanowires and modification of their surface for voltammetric detection of formaldehyde
Keywords:
nickel, nanowires, voltammetry, electrocatalysis, formaldehydeAbstract
The preparation of nickel nanowires by reduction of nickel chloride with hydrazine hydrate in ethylene glycol is described. The possibility of controlling the size and thickness of nickel nanowires by applying a constant magnetic field to the reaction mixture is demonstrated. It was revealed that electrochemical modification of electrode based on nickel nanowires in NaOH solution leads to the formation of active Ni(OH)2 – NiOOH layers on the surface of nanowires. The formation of the Ni(OH)2 – NiOOH – Ni composite system is promising for the voltammetric detection of formaldehyde due to the specific chemical sorption of formaldehyde molecules on the electrode surface and their subsequent oxidation with NiOOH. The linear range of formaldehyde determination was 1–45 mmol/L, the lower limit of determination of formaldehyde – 0.027 mmol/L, the sensitivity coefficient – 210 nA ⋅ μg−1 ⋅ mmol/L−1.
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