title: Phenolic sensor development based on chromium oxide-decorated carbon nanotubes for environmental safety.
abstract: A nanocomposite (NC) composed of chromium(III)oxide nanomaterials decorated carbon nanotubes (Cr2O3-CNT NC) was prepared via a simple solution method with reducing agents in an alkaline medium. The Cr2O3-CNT NC was characterized using ultraviolet-visible (UV/Vs.) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (XEDS), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field-emission scanning electron microscopy (FESEM). The Cr2O3-CNT composite was deposited on a flat glassy carbon electrode (GCE) with conducting nafion (5%) binders to produce a sensor that exhibited fast response and high selectivity toward 4-methoxyphenol (4MP) in phosphate buffer phase at pH 7. Furthermore, the sensor performance parameters, including the sensitivity, lower detection range, reliability, and reproducibility, ease of integration, long-term stability, and selectivity were investigated in detail. The calibration plot was found to be linear in the concentration range of 0.01 nM-0.1 μM. The sensitivity and detection limit were calculated as 1.4768 μA cm-2μM-1and 0.06428 ± 0.0002 nM (at a signal-to-noise ratio of 3), respectively. Thus, it was concluded that the proposed selective and efficient sensor represents a promising approach to effectively detect toxic phenolic compounds in the environment with acceptable and reliable results.
authors.affiliation: Chemistry Department, King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia; Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia. Electronic address: mmrahman@kau.edu.sa.
authors.forename: Mohammed M
authors.initials: MM
authors.lastname: Rahman
authors.affiliation: Chemistry Department, King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia.
authors.forename: Hasan B
authors.initials: HB
authors.lastname: Balkhoyor
authors.affiliation: Chemistry Department, King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia; Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia.
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Asiri
mesh_terms: D000840:Anisoles / Q000032:analysis* / Q000737:chemistry; D017608:Chromium Compounds / Q000737:chemistry*; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D056951:Photoelectron Spectroscopy; D033362:Powder Diffraction; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000840:Anisoles; D017608:Chromium Compounds; D005465:Fluorocarbon Polymers; D037742:Nanotubes, Carbon; C040402:perfluorosulfonic acid; C009760:mequinol; C023600:chromic oxide
keywords: 4-Methoxyphenol; Cr(2)O(3)–CNT nanocomposite; Environmental safety; Green synthesis; I–V method; Sensitivity