Glassy Carbon Electrodes Decorated with HgO/CNT Nanocomposite and Modified with a Conducting Polymer Matrix for Enzyme‐Free Ascorbic Acid Detection

Abstract

In an alkaline solution, mercuric oxide decorated carbon nanotube nanocomposites (HgO.CNT NCs) were manufactured utilizing an uncomplicated wet-chemical approach. Ultra-Violet spectroscopy (UV-Visible), Fourier Transform Infra-red spectroscopy (FTIR), Powder X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), and Field Emission Scanning Emission Microscopy (FESEM), X-ray Electron Dispersive Spectroscopy (XEDS) techniques were applied to examine the HgO.CNT NCs that had been prepared. Ascorbic acid sensor was developed upon light coating of HgO.CNT NCs on polished Glassy carbon electrode (GCE) modified with nafion (Nf). Analytical performance of the selected ascorbic acid sensor was achieved such as sensitivity, Limit of quantification (LOQ), Limit of detection (LOD), Linear dynamic range (LDR), extended reliability, interference effect experimentation, and actual sample inspection using a consistent current-voltage approach. Calibration curve of the suggested sensor was observed to be linear (R 2 = 0.9957) throughout a broad range of ascorbic acid concentrations (100.0 pM ∼ 100.0 mM) at a voltage of 0.8 V. The calibration curve yielded analytical parameters such as sensitivity (632.91 pAμM À 1 cm À 2 ), LOQ (255.0 pM), LOD (76.50 pM), and LDR (100.0 pM ∼ 1.0 mM) for the proposed ascorbic acid sensor (GCE/HgO.CNT NCs/Nf). The wet-chemical synthesis of HgO.CNT NCs is a good development of nanocompositeoriented sensor advancement in medical sciences with nonenzymatic detection of biological substances. This proposed sensor applied to selective ascorbic acid detection in biological samples and obtained logical outcomes.

Carbon Nanotube and Its Derived Nanomaterials Based High Performance Biosensing Platform

“…Pinals, R et al introduced an SWCNT-based optical sensing approach toward this end [ 179 ]. SARS-CoV-2 enters the host cell through binding to the ACE2 receptor [ 216 ]. They used ACE2 to fabricate the noncovalently functionalized SWCNT as a virus sensor since ACE2 has a high binding affinity to the SARS-CoV-2 spike protein.…”

Electrochemical sensor based on carbon material derived from Physalis alkekengi L. husks for the analysis of ascorbic acid

“…Identifying suitable electrode modification materials has become the main way to solve this problem. Materials commonly used for the surface modification of electrodes in the electrochemical analysis of AA include graphene, 10,12 carbon nanotubes and their composites, 13 metal–organic frameworks (MOFs), 14 metallic inorganic materials , 15,16 and organic conductive polymers 17 …”

“…Materials commonly used for the surface modification of electrodes in the electrochemical analysis of AA include graphene, 10,12 carbon nanotubes and their composites, 13 metal-organic frameworks (MOFs), 14 metallic inorganic materials ,15,16 and organic conductive polymers. 17 Bio-based carbon materials have the advantages of abundant raw materials, low costs, ease of preparation, and simple preparation methods. At the same time, biological waste can be reused, which is in line with the concept of green chemistry.…”