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

        Xinjin Zhang,Qinglin Sheng,Jian-Bin Zheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2

        Halloysite nanotubes@polydopamine (HNTs@PDA) nanocomposites were successfully synthesized, and Au nanoparticles (AuNPs) 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 andX-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 μmol · L -1 to 2.8 mmol · L -1, with a sensitivity of 171.7 μA (mmol · L -1) -1 cm -2 and a detection limit of 0.25 μmol · L -1 (S/N = 3).

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