Highly Sensitive and Simultaneous Detection of Hydroquinone and Catechol Using Poly(mercaptoacetic acid)/Exfoliated Graphene Composite Film‐modified Electrode

Abstract

Graphene nanosheets were facilely prepared through one‐step liquid‐phase exfoliation of graphite powder in N,N‐dimethylformamide (DMF) with the assistance of sodium citrate, and then employed to modify the surface of glassy carbon electrode (GCE) via solvent evaporation. Subsequently, mercaptoacetic acid (MA) was electrodeposited onto the surface of exfoliated graphene‐modified GCE (EG/GCE) to construct a composite film‐modified electrode (pMA/EG/GCE). The electrochemical behaviors of hydroquinone (HQ) and catechol (CC) were studied. It was found that the oxidation peak currents of HQ and CC increased obviously on the surface of EG/GCE and pMA/GCE, compared with those on bare GCE. However, the oxidation signals of HQ and CC further enhanced greatly on the surface of pMA/EG/GCE, showing strong synergetic enhancement effects. As a result, a highly sensitive electrochemical method was developed for the simultaneous determination of HQ and CC. The linear range was from 0.1 to 100 μmol L−1, and the detection limits were 85 and 80 nmol L−1 for HQ and CC (S/N=3).

Graphene/Polypyrimidine Composite Film Modified Electrode for Electrochemical Determination of Sunset Yellow

“…The graphene suspension was prepared by sonicating the mixtures of graphite powder and sodium citrate in DMF solvent [11]. Typically, 15 mg of graphite powder and 5 mg of sodium gallate were added into 5 mL of DMF, and then sonicated in a KQ-2200DE ultrasonicator (frequency: 50 kHz, power: 220 W; Kunshan Ultrasonic Instrument Co., Ltd, China) for 3 h at room temperature.…”

Electrochemical Sensing Platforms of Dihydroxybenzene: Part 1 – Carbon Nanotubes, Graphene, and their Derivatives

“…Higher electrocatalytic activity was achieved owing to the presence of defects on tryptophan‐functionalized graphene. Among the different synthesis methods for GR, solvent exfoliation has gained considerable attention for its gentle and convenient synthesis process [149] . However, to obtain a high yield, a long period of stirring is required.…”

“…However, to obtain a high yield, a long period of stirring is required. Fu and his colleagues [149] synthesized exfoliated GR (EG) with the assistance of sodium citrate. The exfoliation of graphite powder in N , N dimethylformamide (DMF) produced a high yield in a shorter time.…”

Detection of Catechol Using a Biosensor Based on Biosynthesized Silver Nanoparticles and Polyphenol Oxidase Enzymes

“…However, these techniques have some disadvantages, such as complicated operation, sample pre-treatment, poor selectivity and high cost. On the other hand, sensor technology is one of the most widely adopted in biological and environmental sample analysis, due to its several advantages, such as rapid response, shorter analysis time, no samples pre-treatment, low cost, high sensitivity and selectivity [9]. The sensor performance is, however, dependent of the electrode material and of its composition.…”