Sensor For Determination Of Hydrogen Peroxide Research Articles

Copper(II) Oxide Nanoparticles Embedded within a PEDOT Matrix for Hydrogen Peroxide Electrochemical Sensing

The aim of this study is the preparation of nanostructured copper(II) oxide-based materials (CuONPs) through a facile additive-free polyol procedure that consists of the hydrolysis of copper(II) acetate in 1,4-butane diol and its application in hydrogen peroxide sensing. The nonenzymatic electrochemical sensor for hydrogen peroxide determination was constructed by drop casting the CuONP sensing material on top of a glassy carbon electrode (GCE) modified by a layer of poly(3,4-ethylenedioxythiophene) conducting polymer (PEDOT). The PEDOT layer was prepared on GCE using the sinusoidal voltage method. The XRD pattern of the CuONPs reveals the formation of the monoclinic tenorite phase, CuO, with average crystallite sizes of 8.7 nm, while the estimated band gap from UV-vis spectroscopy is of 1.2 eV. The SEM, STEM, and BET analyses show the formation of quasi-prismatic microaggregates of nanoparticles, with dimensions ranging from 1 µm up to ca. 200 µm, with a mesoporous structure. The developed electrochemical sensor exhibited a linear response toward H2O2 in the concentration range from 0.04 to 10 mM, with a low detection limit of 8.5 μM of H2O2. Furthermore, the obtained sensor possessed an excellent anti-interference capability in H2O2 determination in the presence of interfering compounds such as KNO3 and KNO2.

Fabrication and characterization of a Layered Double Hydroxide based catalase biosensor and a catalytic sensor for hydrogen peroxide determination

An enzyme catalase biosensor was fabricated to determine hydrogen peroxide. The enzyme was cross-linked with [ZnIIAlIII (OH)2]+ NO3– Layered Double Hydroxide (LDH), which was glued on a glassy carbon (GC) electrode. The amperometric response to hydrogen peroxide was studied. A limit of detection (LOD) of about 0.20 mM and a good lifetime as high as 75 days were observed. A sensor with the same configuration, without the immobilized catalase enzyme and with LDH glued on (GC), was also realized. This non-enzymatic sensor also showed catalytic activity towards H2O2, exhibiting an amperometric response obviously much lower than that of the enzyme biosensor, with a LOD of about 1.0 mM. However, also the lifetime of this catalytic sensor was longer than 2 months after preparation.

Preparation of mesoporous silica templated metal nanostructure on Ni foam substrate and its application for the determination of hydrogen peroxide

Nickel oxide nanostructure network electrodes have been fabricated via metal electrodeposition into a silica template on Ni foam as a three-dimensional metal electrode. The metal oxide nanostructure on three-dimensional electrodes provides a pathway to a very high surface area of electrode built on a cheap commercially available material. These electrodes were characterized by electrochemical impedance spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction pattern. The electrochemical properties of the electrodes, such as the electrochemical active area and some kinetic parameters, were investigated. The prepared electrode was applied as an amperometric sensor for hydrogen peroxide determination in low potential. The presented electrode shows good sensitivity and stability. Finally, the proposed electrochemical sensor was successfully applied to determine H2O2 in milk and the method has been validated using independent estimation by the classical potassium permanganate titration method.

Novel Non Enzymatic TBHQ Modified Electrochemical Sensor for Hydrogen Peroxide Determination in Different Beverage Samples

A nanosensor was developed for hydrogen peroxide determination based on nafion/graphene oxide/silver nanoparticles/tertiary butylhydroquinone (TBHQ) modified glassy carbon electrode (N-GO/AgNPs/TBHQ/GCE). Cyclic voltammetry was used to investigate the electrochemical behavior of this modified electrode and differential pulse voltammetry was used for the reduction of H2O2. The limit of detection was 0.46 µmol L-1 and three linear calibration ranges were obtained for H2O2 determination from 1.52-9.79 µmol L-1 for first linear segment, 9.79-231.0 µmol L-1 for second linear segment and 231.0-8330.0 µmol L-1 for third linear segment. Finally, the reliability of the nanosensor was confirmed in the real sample analysis in different beverages with satisfactory results.

A three-dimensional hybrid of MnO2/graphene/carbon nanotubes based sensor for determination of hydrogen-peroxide in milk

A nonenzymatic hydrogen-peroxide (H2O2) sensor was fabricated using the graphene, carbon nanotube and MnO2 hybrid as the sensing material. The hybrid was synthesized in a one-pot reaction process by chemical method. The sensor exhibited extremely high electrocatalytic activity toward the oxidation of H2O2. Under optimum conditions, the proposed biosensor can be applied to the quantification analysis of H2O2 with a wide linear range covering 1–1030μM (R=0.9998) and a low detection limit of 0.1μM.

Functionalized Carbon Nanotubes with Gold Nanoparticles to Fabricate a Sensor for Hydrogen Peroxide Determination

A highly sensitive electrode was prepared based on gold nanoparticles/nanotubes/ionic liquid for measurement of Hydrogen peroxide. Gold nanoparticles of 20–25 nm were synthesized on a nanotube carbon paste electrode by cyclic voltammetry technique while the coverage was controlled by applied potential and time. The gold nanoparticles were modified to form a monolayer on CNT, followed by decoration with ionic liquid for determination of hydrogen peroxide. The experimental conditions, applied potential and pH, for hydrogen peroxide monitoring were optimized, and hydrogen peroxide was determined amperometrically at 0.3 V vs. SCE at pH 7.0. Electrocatalytic effects of gold deposited CNT were observed with respect to unmodified one. The sensitivity obtained was 5 times higher for modified one. The presence of Au particles in the matrix of CNTs provides an environment for the enhanced electrocatalytic activities. The sensor has a high sensitivity, quickly response to H2O2 and good stability. The synergistic influence of MWNT, Au particles and IL contributes to the excellent performance for the sensor. The sensor responds to H2O2 in the linear range from 0.02 µM to 0.3 mM. The detection limit was down to 0.4 µM when the signal to noise ratio is 3.

Indium–tin oxide film electrode as catalytic amperometric sensor for hydrogen peroxide

A commercial indium–tin oxide (ITO) film, deposited on a glass substrate, was investigated for its potential use as a disposable amperometric sensor for hydrogen peroxide determination in aqueous solutions. After a very simple, yet crucial, electrochemical pre-treatment of a fresh ITO film electrode, a stable and sensitive electrocatalytic response to hydrogen peroxide was exhibited. The electrocatalytic character and factors influencing hydrodynamic amperometric performance of the ITO film electrode were examined and discussed. Under optimized conditions, the amperometric signal was linearly proportional to the hydrogen peroxide concentration over the range 8.4 × 10–5–2.1 × 10–3 mol l–1(2.9–71.4 mg l–1) with a detection limit of 5.6 × 10–1 mol l–5 mol l–1(1.9 mg l–1). The electrode also displayed good reproducibility with an sr value of 1.5% for 20 consecutive chronoamperometric measurements of 2.8 × 10–4 mol l–1 hydrogen peroxide.