Amperometric determination of ascorbic acid with a glassy carbon electrode modified with TiO2-gold nanoparticles integrated into carbon nanotubes

Abstract

A glassy carbon electrode was modified with a TiO-gold nanoparticle hybrid integrated with multi-walled carbon nanotubes in a dihexadecylphosphate film (TiO-Au NP-MWCNT-DHP/GCE) and applied to amperometric determination of ascorbic acid (AA). The modified sensor displays fast charge transfer and shows an irreversible anodic behavior for AA by cyclic voltammetry. Under optimal experimental conditions and using amperometry at 0.4 V, the analytical curve presented a statistical linear concentration range for AA from 5.0 to 51 μmol L, with a limit of detection of 1.2 μmol L. The electrode was successfully applied to the determination of AA in pharmaceutical and fruit juice without the need for major pretreatment of samples. Graphical abstract Schematic of a new sensing platform for ascorbic acid (AA). It is based on a glassy carbon electrode (GCE) modified with TiO-Au nanoparticles integrated into carbon nanotubes in a dihexadecylphosphate film. The sensor was applied to amperometric determination of AA in juice and pharmaceutical samples.

[Retracted] Solanum tuberosum Leaf Extract Templated Synthesis of Co3O4 Nanoparticles for Electrochemical Sensor and Antibacterial Applications

“…The formed paste was then packed within the Teflon tube, with the presence of efficient pressure to ensure enough electrical contact with the presence of copper wire. The surface of the modified generated CPWE was generated rapidly by extruding a small plug of the prepared paste followed by smoothing the resulting obtained surface on wax paper until the surface becomes shiny enough [ 26 , 27 ]. Finally, the biogenic-synthesized Co 3 O 4 (1 : 1) NPs, Co 3 O 4 (1 : 2) NPs, and Co 3 O 4 (2 : 1) NPs were employed as green alternative and cost-effective working electrodes by modifying the bare CPWE for the sensing of AA and CA.…”

Confinement Catalysis of Non‐covalently Functionalized Carbon Nanotube in Ascorbic Acid Sensing

“…Where C 0 is the concentration of the AA, n is a number of electrons involved in the oxidation (n = 2), and α is transfer coefficient (0.5) [70][71][72]. The calculated D value for irreversible oxidation of AA is 2.96 � 0.18 × 10 À 5 cm 2 s À 1 .…”

Electrochemical Sensor Based on a Carbon Veil Modified by Phytosynthesized Gold Nanoparticles for Determination of Ascorbic Acid

“…As a rule, an electrode modified, in one way or another, serves as a sensor. Currently, carbon materials are widely used in sensor technologies: graphene [13], graphene oxide [14,15], carbon nanotubes [16] to increase the sensor surface, its electrical conductivity and catalytic activity. Unique properties (catalytic, electronic, magnetic, high surface to volume ratio) make nanoparticles highly effective components of sensors [17].…”

“…Unique properties (catalytic, electronic, magnetic, high surface to volume ratio) make nanoparticles highly effective components of sensors [17]. To determine AA, nanosized oxides [14] and metals [14,16,18,19] are used. Nanoparticles accelerate electron transfer and reduce overvoltage of electrochemical process [20][21][22][23].…”

“…Often, nanomaterials are combined with conductive polymer films to ensure selective measurements and fixing nanoparticles on the electrode surface [14,19,24]. It is worth noting that preparing complex, multi-component modifiers requires quite a lot of time, the use of harmful solvents and complex tools [14,16]. In this regard, it is of current interest to further search and develop new highly sensitive and selective electrochemical sensors for AA determination using modern materials and simple, in particular, "green" technologies.…”