Non-Enzymatic Glucose Sensors for Sensitive Amperometric Detection Based on Simple Method of Nickel Nanoparticles Decorated on Magnetite Carbon Nanotubes Modified Glassy Carbon Electrode

Nongyao Nontawong
2017 International Journal of Electrochemical Science  
A sensitive and selective non-enzymatic glucose sensor was developed based on magnetite (Fe 3 O 4 ) and nickel nanoparticles decorated carbon nanotubes (Fe 3 O 4 -CNTs-NiNPs). Fe 3 O 4 nanoparticles were in situ loaded on the surface of carboxylated multi-walled carbon nanotubes (CNTs-COOH) by a chemical co-precipitation procedure. Nickel nanoparticles (NiNPs) were prepared through reducing nickel chloride by hydrazine hydrate and then decorated on Fe 3 O 4 -CNTs using ultra-sonication. The
more » ... sonication. The as-prepared Fe 3 O 4 -CNTs-NiNPs was characterized using transmission electron microscopy (TEM) and X-Ray Diffraction (XRD). Glucose sensor was fabricated using glassy carbon (GC) coated with Fe 3 O 4 -CNTs-NiNPs composites film. Electrochemical investigations indicate that the Fe 3 O 4 -CNTs-NiNPs/GC electrode possesses excellent performance in the electrochemical oxidation of glucose at an applied potential of +0.55 V (vs. Ag/AgCl) in 0.1 M NaOH solution. The linear dynamic range for glucose amperometric detection (E app = +0.55 V) was observed from 10 µM to 1.8 mM (r 2 = 0.998) with the sensitivity of 335.25 µA mM -1 ; and a low detection limit of 6.7 µM (S/N = 3). In addition, the fabricated sensor was successfully applied to determine glucose in honey and energy drinks with good results.
doi:10.20964/2017.02.47 fatcat:mfub44uuurf3fj4iqhuzwm2hvq