Electrochemical Detection of 4-p-nitrophenol Based on TiO2NPs / RGO / AuNPs Composite Modified Glassy Carbon Electrode

Abstract

A glassy carbon electrode modified with TiO2NPs/RGO/AuNPs was used as an electrochemical sensor to detect trace amounts of 4-p-nitrophenol (4-NP). The surface morphology of the composites was characterized by field-emission scanning electron microscopy (FE-SEM). The electrochemical characteristics of the composite electrode were analyzed by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The modified electrode exhibited outstanding electrochemical performance due to the large specific surface area and strong conductivity of composite material. The differential pulse voltammetry(DPV) and square wave voltammetry(SWV) were used for the trace detection of p-nitrophenol. The peak current of the two methods showed a high linear relationship with the 4-NP concentration. The detection range applied DPV method was 0.5-100μmol/L, the detection limit was 0.03μmol/L. When SWV was employed, detection range was from 0.5 to 100μmol/L, The detection limit was 0.08μmol/L. In this study, the electrochemical sensor had the advantage of large detection range, low detection limit, stable, simple and fast analysis. Based on these characteristics, the sensor can be considered as a potential sensor for the detection of 4-NP.

Electrochemical Impedimetric Platform Based on Con A@MIL-101 for Glycoprotein Detection

“…In this work, a glassy carbon electrode (GCE) has been utilized owing to its high chemical stability and small thermal expansion coefficient. 28 Another consideration is that GCE, instead of the gold electrode, is tolerant to the CN − ions released from the redox probe [Fe(CN) 6 ] 3−/4− . Besides the bare base electrode, modifier materials are often used.…”

“…During the fabrication of the electrochemical impedimetric biosensors, the selection of the base electrode materials is important. In this work, a glassy carbon electrode (GCE) has been utilized owing to its high chemical stability and small thermal expansion coefficient . Another consideration is that GCE, instead of the gold electrode, is tolerant to the CN – ions released from the redox probe [Fe­(CN) 6 ] 3–/4– .…”

Cr-MOF-Based Electrochemical Sensor for the Detection of P-Nitrophenol

“…Among them, p-nitrophenol (p-NP) is one of the most common phenolic pollutants, which not only harms our health but causes serious pollution to the environment [ 3 , 4 ]. Therefore, in order to ensure the safety of our living environment, a simple and efficient detection method to detect low concentrations of p-NP, whose concentration may be as low as 0.2 mg/L [ 5 , 6 ], becomes emergent.…”