Multi-wall carbon nanotube-NiO nanoparticle composite as enzyme-free electrochemical glucose sensor

摘要

We report a simple, solvent-free method to decorate multi-walled carbon nanotubes (MWCNTs) with nickel oxide nanoparticles (NiO-NPs). The as prepared NiO-MWCNT com;posite were characterised by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The enzyme-free modified carbon paste electrode (CPE) was fabricated using as-synthesised com;posite material and investigated for glucose sensing. The 10% NiO-MWCNTs com;posites sensor showed excellent electro-catalytic activity towards direct glucose oxidation. The sensitivity of this sensor is found to be 1696 p-AmM~(-1) cm~(-2) and 122.1 μAmM~(-1) cm~(-2) and the limit of detection (LOD) was found to be 11.04nM and 31 μM for the linear response over glucose concentration ranging from 1 -200 μM to 0.5-9.0 mM, respectively. Furthermore, the 10% NiO-MWCNTs sensor also showed excellent anti-interference ability, high stability and good reproducibility. Hence, due to simple method of material preparation, easy sensor fabrication and excellent electro catalytic activity towards glucose oxidation, the 10% NiO-MWCNT/CPE is a potential material for the development of enzyme-free sensor for reliable glucose determination.