Abstract
In this paper, we report a novel electrochemical sensor for the sensitive detection of Cu(II) ions based on Tl2O3 nanostructures supported on multi-walled carbon nanotube—pencil graphite electrode. Firstly we reported the synthesis and characterization of Tl2O3 NSs via sonochemical method. The as-synthesized nanostructures were characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy. According to our knowledge, it was first time that ethylenediamine and propylendiamine were used as pH controller agent in synthesis of Tl2O3 nanostructures. Finally, a pencil graphite electrode was decorated using Tl2O3 NSs and MWCNT to provide an electrochemical device for Cu2+ ions sensing. Using this modified electrode, three oxidation states of copper ions were observed. This device showed agreeable responses to trace amounts of Cu2+ in phosphate buffer solutions in which the limit of detection was found to be 4.63 nmol/L for Cu2+.
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