Visible Light-driven Photoelectrochemical Determination of p-Nitrophenol Based on CdSe Quantum Dots and DNA Composite Film Modified Electrode

Abstract

21,22 electrochemistry, 16,23 spectrophotometry, 24 and chemiluminescence, 25 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.

A voltammetric sensor based on a reduced graphene oxide/β-cyclodextrin/silver nanoparticle/polyoxometalate nanocomposite for detecting uric acid and tyrosine

“…9 Herein, we focus on the fabrication of novel metal/carbon electrodes for enlarging the scope of electroanalytical applications. 10,11…”

“…9 Herein, we focus on the fabrication of novel metal/carbon electrodes for enlarging the scope of electroanalytical applications. 10,11 Among various carbon materials, graphene is the most commonly used carbon nanomaterial in scientic elds owing to its large surface area, strong mechanical properties, thermal stability, and excellent conductivity. [12][13][14][15] These unique properties have made it a hot candidate material in electroanalysis applications.…”

Amide Functionalized Ionic Liquid as Facile Fluorescent Probe for Detection of Nitrophenolic Compounds

“…Spectrofluorometric detection is one of the best choices among various techniques used in analytical method developments due to its high sensitivity and selectivity . A variety of fluorescence probes have been proposed for sensing of PA and NP such as conjugated or inorganic polymers, nanomaterials, metal‐organic framework, organic scaffolds, biomaterials, quantum dots etc. Yet, various ionic liquids directly or indirectly have been employed in detection of nitroaromatics, for instance, fluorescent polymeric ILs, IL assisted fluorescent metal‐organic frameworks, IL coated glassy carbon electrode as electrochemical sensor etc.…”