Rapid Iodine Sensing on Mechanically Treated Carbon Nanofibers

Abstract

In this work, we report on a rapid, efficient electrochemical iodine sensor based on mechanically treated carbon nanofiber (MCNF) electrodes. The electrode’s highly graphitic content, unique microstructure, and the presence of nitrogen heteroatoms in its atomic lattice contribute to increased heterogeneous electron transfer and improved kinetics compared to conventional pyrolytic carbons. The electrode demonstrates selectivity for iodide ions in the presence of both interfering agents and high salt concentrations. The sensor exhibits clinically relevant limits of detection of 0.59 µM and 1.41 µM, in 1X PBS and synthetic urine, respectively, and a wide dynamic range between 5 µM and 700 µM. These results illustrate the advantages of the material’s unique electrochemical properties for iodide sensing, in addition to its simple, inexpensive fabrication. The reported iodine sensor eliminates the need for specimen processing, revealing its aptitude for applications in point-of-care diagnostics.

Operando Studies of Iodine Species in an Advanced Oxidative Water Treatment Reactor

“…The first peak at 0.37 V shows the oxidation of Ito I 3 and the second peak at 0.51 V shows the oxidation of I 3 to I 2 . 52,53 (It is possible the two peaks may be associated with a combination of adsorption and electron transfer steps. 48,49,53 However, coupled electrochemical reactions and adsorption processes can complicate the voltammetry, and more detailed studies beyond the scope of this work would be needed to confirm the reaction mechanism.)…”

Carbon Nanofiber-Based Functional Nanomaterials for Sensor Applications

“…In addition, CNFs also have good electron transfer ability. These characteristics make CNFs-based nanomaterials have broad prospects in chemical sensing [80,81,82,83]. According to the type and nature of the target substances, we mainly introduce the application of CNFs-based nanomaterials as sensors in the following four aspects.…”

Electrochemical and electrical response of bismuth-aniline complex under the exposure of organic and inorganic environment

“…An anion-exchange chromatographic separation method, coupled with amperometric technique, was reported for the accurate determination of free iodide in real samples [24]. Carbon nanofiber modified electrode based electrochemical device exhibited selective iodide ion recognition in presence of both interfering agents and high salt concentrations [25]. Cyclic voltammetry technique was reported for the detection of iodide ions using a silver nanoparticle modified electrode and the voltammetric detection signatures correspond to the oxidation of silver to silver iodide [21].…”