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A hydrogen peroxide (H 2 O 2 ) sensor and biosensor based on modified multi-walled carbon nanotubes (CNTs) with titanium dioxide (TiO 2 ) nanostructures was designed and evaluated. The construction of the sensor was performed using a glassy carbon (GC) modified electrode with a TiO 2 -CNT film and Prussian blue (PB) as an electrocalatyzer. The same sensor was also employed as the basis for H 2 O 2 biosensor construction through further modification with horseradish peroxidase (HRP) immobilized at the TiO 2 -fCNT film. Functionalized CNTs (fCNTs) and modified TiO 2 -fCNTs were characterized by Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and X-Ray DifFraction (XRD), confirming the presence of anatase over the fCNTs. Depending on the surface charge, a solvent which optimizes the CNT dispersion was selected: dimethyl formamide (DMF) for fCNTs and sodium dodecylsulfate (SDS) for TiO 2 -fCNTs. Calculated values for the electron transfer rate constant (ks) were 0.027 s -1 at the PB-fCNT/GC modified electrode and 4.7 × 10 -4 s -1 at the PB-TiO 2 /fCNT/GC electrode, suggesting that, at the PB-TiO 2 /fCNT/GC modified electrode, the electronic transfer was improved. According to these results, the PB-fCNT/GC electrode exhibited better Detection Limit (LD) and Quantification Limit (LQ) than the PB-TiO 2 /fCNT/GC electrode for H 2 O 2 . However, the PB film was very unstable at the potentials used. Therefore, the PB-TiO 2 /fCNT/GC modified electrode was considered the best for H 2 O 2 detection in terms of operability. Cyclic Voltammetry (CV) behaviors of the HRP-TiO 2 /fCNT/GC modified electrodes before and after the chronoamperometric test for H 2 O 2 , suggest the high stability of the enzymatic electrode. In comparison with other HRP/fCNT-based electrochemical biosensors previously described in the literature, the HRP-fCNTs/GC modified electrode did not show an electroanalytical response toward H 2 O 2 .

nanomaterials

Peroxide Electrochemical Sensor and Biosensor Based on Nanocomposite of TiO2 Nanoparticle/Multi-Walled Carbon Nanotube Modified Glassy Carbon Electrode