Molybdenum oxide grafted-polyaniline nanocomposite modified ITO electrode for electrochemical sensing of arsenic oxyanion

Potentiometric sensing of oxyanions such as arsenate over self-assembly engineered and chemically responsive molybdenum dioxide grafted polyaniline (PANI/MoO3) plated ITO glass electrode has been reported. FT-IR, XRD, SEM, EDX, STEM-mapping, Raman spec-troscopy, and N2 adsorption-desorption measurements were used to determine the impact of molecular architecture on the structure, morphology, and physical characteristics of PANI/MoO3. The obtained result implies the synthesis of a porous hybrid nanostructured material with enhanced orientated crystallinity, enhanced adsorption capacity, and responsiveness because of an optimized molecular structure and crystallinity alignment. The limit of detection (LOD) for detecting As(V) ions by using PANI/MoO3 composite/ITO electrodes based on the differential pulse voltammetry technique (DPV) was found to be around 0.15 ppb. The interaction between arsenate and molybdate oxyanions led to the development of an induced potential, which helped to clarify the sensing mechanism, charge transfer, and shifting characteristics. For the on-site detection of residual arsenate in diverse environmental samples, the analytical performance of the produced electrode in a genuine sample was also investigated.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

Potentiometric sensing of oxyanions such as arsenate was achieved using a self-assembly engineered and chemically responsive molybdenum dioxide grafted polyaniline (PANI/MoO3) plated ITO glass electrode. Characterization techniques were used to determine the impact of molecular architecture on the structure, morphology, and physical characteristics of PANI/MoO3, confirming enhanced crystallinity, adsorption capacity, and responsiveness. The LOD for As(V) ion detection using the PANI/MoO3 composite/ITO electrode was found to be 0.15 ppb, and the sensing mechanism, charge transfer, and shifting characteristics were elucidated through the interaction between arsenate and molybdate oxyanions. The electrode's analytical performance in detecting residual arsenate in diverse environmental samples was also investigated.