Ultrasensitive Nonenzymatic Real-Time Hydrogen Peroxide Monitoring Using Gold Nanoparticle-Decorated Titanium Dioxide Nanotube Electrodes

An amperometric enzyme-free hydrogen peroxide (H2O2) sensor was developed by catalytically stabilizing active gold nanoparticles (Au NPs) of 4–5 nm on a porous titanium dioxide nanotube (TiO2 NTs) electrode. The Au NPs were homogeneously distributed anatase TiO2 NTs with an outer diameter ~102 nm, inner ~60 and wall thickness ~40 nm. cyclic voltammogram the composite electrode showed pair redox peaks characterizing electrocatalytic reduction H2O2. entrapping prevented aggregation facilitated good electrical conductivity electron transfer rate, thus generating wide linear range, low detection limit ~104 nM, high sensitivity ~519 µA/mM, as well excellent selectivity, reproducibility, repeatability, stability over 60 days. Furthermore, recovery relative standard deviation (RSD) achieved in real samples, which tap water, milk, Lactobacillus plantarum bacteria, thereby verifying accuracy potentiality nonenzymatic sensor.