title: Visible Light-driven Photoelectrochemical Determination of p-Nitrophenol Based on CdSe Quantum Dots and DNA Composite Film Modified Electrode.
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.
authors.affiliation: Key Laboratory for Large-Format Battery Materials and System (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology.
authors.forename: Kai
authors.initials: K
authors.lastname: Yan
authors.forename: Yuhan
authors.initials: Y
authors.lastname: Zhu
authors.forename: Ling
authors.initials: L
authors.lastname: Cheng
authors.forename: Jingdong
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000379:methods*; D019187:Cadmium Compounds / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D004247:DNA; D004563:Electrochemistry; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry; D008027:Light; D057230:Limit of Detection; D009596:Nitrophenols / Q000032:analysis* / Q000737:chemistry; D055668:Photochemical Processes; D045663:Quantum Dots / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D009596:Nitrophenols; D018036:Selenium Compounds; D002244:Carbon; D004247:DNA; C058667:cadmium selenide; D006861:Hydrogen Peroxide; C024836:4-nitrophenol