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Preparation of Tubular HNTs@PDA–Au Nanocomposites and its Electrocatalysis of Hydrazine

Institute of Analytical Science, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi’an, Shaanxi 710069, P. R. China

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Qinglin Sheng

Institute of Analytical Science, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi’an, Shaanxi 710069, P. R. China

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, and

Jianbin Zheng

http://orcid.org/0000-0001-6980-3096

Institute of Analytical Science, Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi’an, Shaanxi 710069, P. R. China

E-mail Address: zhengjb@nwu.edu.cn

Corresponding author.

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https://doi.org/10.1142/S1793292018500194Cited by:5 (Source: Crossref)

Abstract

Halloysite nanotubes@polydopamine (HNTs@PDA) nanocomposites were successfully synthesized, and Au nanoparticles (Au NPs) were loaded on HNTs@PDA by electrostatic adsorption. The electrochemical sensor based on HNTs@PDA–Au nanocomposites was constructed. The effect of the composition, structure and property of HNTs@PDA–Au on the response performance of the sensor was explored. The morphology and composition of the nanocomposites were characterized by field emission scanning electron microscopy, transmission electron microscopic, X-ray diffraction, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Electrochemical results revealed HNTs@PDA–Au as the sensing interface with good effect on electrocatalytic oxidation of N₂H₄. This sensor detected N₂H₄ in the range from 0.75 $μ$ mol $\cdot$ L $^{- 1}$ to 2.8mmol $\cdot$ L $^{- 1}$ , with a sensitivity of 171.7 $μ$ A (mmol $\cdot$ L $^{- 1})^{- 1}$ cm $^{- 2}$ and a detection limit of 0.25 $μ$ mol $\cdot$ L $^{- 1}$ (S/N $=$ 3).

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