Hierarchical and hybrid RGO/ZIF-8 nanocomposite as electrochemical sensor for ultrasensitive determination of dopamine

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2017-09, Vol.801, p.496-502
• Main Authors: Yu, Gege, Xia, Jianfei, Zhang, Feifei, Wang, Zonghua
• Format: Article
• Language: English
• Subjects: Ascorbic acid; Chemical sensors; Determination; Dopamine; Electrical resistivity; Electrochemical sensor; Graphite; Metal-organic frameworks; Morphology; Nanocomposites; Porosity; Reduced graphene oxide; Scanning electron microscopy; Sensors; Synergistic effect; Voltammetry; X-ray diffraction; ZIF-8
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2017.08.038

A hierarchical and hybrid nanocomposite of reduced graphene oxide/zeolitic imidazolate framework-8 (RGO/ZIF-8) has been successfully fabricated by the RGO as template for the in situ growth of ZIF-8. The morphology and structure of the resulted RGO/ZIF-8 nanocomposite were characterized by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was demonstrated that ZIF-8 nanoparticles anchored and grew well on the surfaces of RGO. The electrocatalytic activity of the RGO/ZIF-8 towards the dopamine (DA) was investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results demonstrated the fabricated RGO/ZIF-8 sensor exhibited high sensitivity for the determination of DA, owing to the synergistic effect from highly electrical conductivity of RGO and porosity of ZIF-8. Under the optimal conditions, the linear response range for DA was from 1.0×10−7 to 1.0×10−4molL−1 and the detection limit of DA was estimated to be as low as 3×10−8molL−1. Moreover, the prepared electrochemical sensor also showed excellent selectivity for DA detection in the presence of ascorbic acid (AA) and prospective results in real samples detection. [Display omitted] •RGO/ZIF-8 nanocomposite was prepared using in situ growth with graphene as template.•RGO/ZIF-8/GCE was constructed for DA detection.•The proposed method exhibited wide linear range and low detection limit.•RGO/ZIF-8/GCE was applied to detect DA in human serum with satisfactory results.