Nickel oxide Nanoparticles/Carbon Nanotubes Nanocomposite for Non-enzymatic Determination of Hydrogen Peroxide

In this work, nickel oxide nanoparticles-modified multi-walled carbon nanotubes (CNTs) were prepared and used for H2O2 sensing application. Firstly, ex situ NiO nanoparticles (NPs) were prepared and further used to decorate polyethylenimine (PEI)-modified carboxylated CNTs. The obtained nanocomposite and its precursors were identified by using X-ray diffraction, thermal analysis, Raman spectroscopy and SEM and TEM images, N2 adsorption-desorption isotherms, and electrochemical techniques. The sensing properties of the NiO-modified nanocomposite toward H2O2 were studied by electrochemical techniques using glassy carbon electrodes (GCEs) as support material. After optimizing the sensor construction, the sensor sensitivity was about of 0.83 +/- 0.01 A M-1 cm(-2) with a LOD of about 1.0 mu M. In addition, it showed excellent anti-interference properties, reproducibility, and stability (over 4 months). Finally, such sensors were coupled to a flow injection device and the H2O2 concentration of some commercial antiseptic solutions were successfully obtained (with recovery ratios between 96.3-102.4 %).