Abstract
A novel photoelectrochemical strategy for the sensitive determination of p-nitrophenol (PNP) was developed using a glassy carbon electrode (GCE) modified with CdSe quantum dots (QDs) and DNA composite film (CdSe-DNA/GCE). Various surface analytical techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), were employed to characterize the synthesized CdSe QDs and CdSe-DNA modified electrode. The interfacial behaviors of the modified electrodes were analyzed by electrochemical impedance spectroscopy (EIS), and the interaction between PNP and DNA was studied by UV-visible spectrometry. Due to the PNP-DNA interaction, CdSe-DNA/GCE exhibited a sensitive photocurrent response toward PNP under visible-light irradiation. The influencing factors, such as the concentration of DNA used for fabricating CdSe-DNA/GCE and the bias potential applied in the photoelectrochemical measurement, were investigated. Under the optimized conditions, the photocurrent on CdSe- DNA/GCE was linearly increased with the PNP concentration from 0.7 to 50 μmol L−1, with a detection limit (3 S/N) of 0.27 μmol L−1. The proposed photoelectrochemical strategy was successfully applied to monitoring the degradation of PNP.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 61172005). The authors thank the Analytical and Testing Center of HUST for help in the characterization of synthesized materials.
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Yan, K., Zhu, Y., Cheng, L. et al. Visible Light-driven Photoelectrochemical Determination of p-Nitrophenol Based on CdSe Quantum Dots and DNA Composite Film Modified Electrode. ANAL. SCI. 31, 669–675 (2015). https://doi.org/10.2116/analsci.31.669
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DOI: https://doi.org/10.2116/analsci.31.669