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. 2020 Dec 29:2020:6693595.
doi: 10.1155/2020/6693595. eCollection 2020.

An Electrochemical Sensor Based on Gold Nanodendrite/Surfactant Modified Electrode for Bisphenol A Detection

Nguyen Thi Lien  1 , Le Quoc Hung  2 , Nguyen Tien Hoang  3 , Vu Thi Thu  3 , Dau Thi Ngoc Nga  3 , Pham Thi Hai Yen  2 , Pham Hong Phong  2 , Vu Thi Thu Ha  2   3
Affiliations

An Electrochemical Sensor Based on Gold Nanodendrite/Surfactant Modified Electrode for Bisphenol A Detection

Nguyen Thi Lien et al. J Anal Methods Chem. .

Abstract

In the present work, we reported the simple way to fabricate an electrochemical sensing platform to detect Bisphenol A (BPA) using galvanostatic deposition of Au on a glassy carbon electrode covered by cetyltrimethylammonium bromide (CTAB). This material (CTAB) enhances the sensitivity of electrochemical sensors with respect to the detection of BPA. The electrochemical response of the modified GCE to BPA was investigated by cyclic voltammetry and differential pulse voltammetry. The results displayed a low detection limit (22 nm) and a linear range from 0.025 to 10 µm along side with high reproducibility (RSD = 4.9% for seven independent sensors). Importantly, the prepared sensors were selective enough against interferences with other pollutants in the same electrochemical window. Notably, the presented sensors have already proven their ability in detecting BPA in real plastic water drinking bottle samples with high accuracy (recovery range = 96.60%-102.82%) and it is in good agreement with fluorescence measurements.

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Conflict of interest statement

The authors declare that they have no conflicts of interest.

Figures

Figure 1
Figure 1
SEM images of (a) GCE, (b) CTAB/GCE, (c) AuNDs/GCE, and (d) AuNDs/CTAB/GCE samples.
Figure 2
Figure 2
Nyquist diagrams of GCE, CTAB/GCE, AuNDs/GCE, and AuNDs/CTAB/GCE in the solution containing 5 mM Fe(CN)63−/4− and 0.1 M PBS. Parameters are as follows: Frequency range from 0.1 Hz to 10000 Hz, initiative potential: 0.23 V, amplitude: 10 mV, and quiet time of 5 s.
Figure 3
Figure 3
CVs of GCE, CTAB/GCE, AuNDs/GCE, and AuNDs/CTAB/GCE in 5 mM Fe(CN)63− and 0.2 M PBS, from − 0.2 to 0.6 V versus Ag/AgCl.
Figure 4
Figure 4
(a) CVs of BPA 10 µm in PBS pH 7 recorded on AuNDs/CTAB/GCE at different scan rates (ν): 10, 20, 50, 100, and 200 mVs−1. (Inset) Relationship (b) between anodic peak currents and scan rate and (c) between potentials and ln(ν).
Figure 5
Figure 5
DPVs of 50 µm BPA on AuNDs/CTAB/GCE in PBS pH 7 with different pH: 5.0; 6.0; 7.0; 8.0, and 9.0 (a). Currents varied by pH (b) and relationship between potentials and pH (c).
Figure 6
Figure 6
Peak current of BPA at 1.0, 5.0, and 10.0 µm on GCE, CTAB/GCE, AuNDs/GCE, and AuNDs/CTAB/GCE recorded in PBS pH 7.
Figure 7
Figure 7
(a) Voltammograms recorded from BPA in the concentration range from 0.025 to 10 µm using AuNDs/CTAB/GCE and (b) the variations of peak intensities according to the concentration change.
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