Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 19, Issue 8, Pages 5279-5286Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2019.16820
Keywords
Au; NiO; MWCNTs; Nitrite; Electrochemical Determination
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Gold (Au)/nickel oxide (NiO) nanocomposites were loaded on multi-walled carbon nanotubes (MWCNTs) utilizing a relatively facile and directly electrochemical deposition method. Transmission electron microscopy (TEM) reveals that the nanocomposites of Au/NiO were successfully covered on the MWCNTs surface. Scanning transmission electron microscopy (STEM) demonstrated the presence of the Au, Ni and O element. The electrochemical performance of the proposed electrode was investigated via cyclic voltammetry (CV) and chronoamperometry. The results showed that Au/NiO/MWCNTs exposed an obvious current response toward nitrite and the anodic peak current varied linearly with nitrite concentration ranging from 0.1 mu M to 10 mu M (R = 0.99865) accompanying with a low detection limit of 0.02 mu M. The Au/NiO/MWCNTs electrode also showed great stability and reproducibility for nitrite detection. Moreover, it also displayed good performance for nitrite detection in tap water suggesting its feasibility on specific application.
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