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. 2021 Sep 30;13(19):3379.
doi: 10.3390/polym13193379.

Fabrication of Novel and Potential Selective 4-Cyanophenol Chemical Sensor Probe Based on Cu-Doped Gd2O3 Nanofiber Materials Modified PEDOT:PSS Polymer Mixtures with Au/µ-Chip for Effective Monitoring of Environmental Contaminants from Various Water Samples

Mohammed Muzibur Rahman  1   2 , S Y Alfaifi  1
Affiliations

Fabrication of Novel and Potential Selective 4-Cyanophenol Chemical Sensor Probe Based on Cu-Doped Gd2O3 Nanofiber Materials Modified PEDOT:PSS Polymer Mixtures with Au/µ-Chip for Effective Monitoring of Environmental Contaminants from Various Water Samples

Mohammed Muzibur Rahman et al. Polymers (Basel). .

Abstract

Herein, a novel copper-doped gadolinium oxide (Cu-doped Gd2O3; CGO) nanofiber was synthesized by a simple solution method in the basic phase and successfully characterized. We have used Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and Energy-Dispersive Spectroscopy (EDS) techniques for characterization of the CGO nanofiber. The CGO nanofiber was used later to modify Au-coated μ-Chips with poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) polymer mixtures (coating binder) to selectively detect 4-cyanophenol (4-CP) in an aqueous medium. Notable sensing performance was achieved with excellent sensitivity (2.4214 µAµM-1 cm-2), fast response time (~12 s), wide linear dynamic range (LDR = 1.0 nM-1.0 mM: R2 = 0.9992), ultra-low detection limit (LoD; 1.3 ± 0.1 pM at S/N = 3), limit of quantification (LoQ; 4.33 pM), and excellent reproducibility and repeatability for CGO/Au/μ-Chip sensor. This CGO modified Au/μ-chip was further applied with appropriate quantification and determination results in real environmental sample analyses.

Keywords: 4-Cyanophenol; Cu-doped Gd2O3 nanofibers; PEDOT:PSS polymer matrixes; electrochemical method; real sample analysis; tiny Au/µ-Chip.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Scheme 1
Scheme 1
Schematic representation of 4-CP detection with CGO/PEDOT:PSS/Au/μ-Chip.
Figure 1
Figure 1
Structural and Optical characterization. (a) XRD spectrum and (b) FTIR spectrum of CGO nanofiber.
Figure 2
Figure 2
Morphological and elemental analysis. (a,b) Low to high-resolution FE-SEM images and (c,d) EDS spectrum of the CGO nanofibers.
Scheme 2
Scheme 2
Proposed electrochemical oxidation mechanism of 4-CP on CGO/PEDOT:PSS/Au/μ-Chip assembly.
Figure 3
Figure 3
Current response from 2.0 µM; 25.0 µL using the CGO/PEDOT:PSS/Au/μ-Chip electrode: (a) Selectivity study of ten interfering chemicals, (b) pH optimization, (c) Au/μ-Chip and CGO/PEDOT:PSS/Au/μ-Chip electrode and (d) Without and with the presence of 4-CP.
Figure 4
Figure 4
(a) Electrochemical responses for different 4-CP solution (0.10 nM to 0.10 M) and (b) Calibration curve of the CGO/Au/μ-Chip at +0.5 V.
See this image and copyright information in PMC

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