One-pot synthesis of a CdS-reduced graphene oxide–carbon nitride composite for self-powered photoelectrochemical aptasensing of PCB72. Issue 13 (19th March 2019)

• Record Type: Journal Article
• Authors: Sun, Mengjun; Li, Ruizhen; Zhang, Jingdong; Yan, Kai; Liu, Min
• Is Part Of: Nanoscale. Volume 11:Issue 13(2019)
• Page Start: 5982
• Page End: 5988
• Publication Date: 2019-03-19
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr00966c
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We synthesized a CdS–rGO–C3 N4 nanocomposite with enhanced photoelectrochemical (PEC) performance to construct a self-powered PEC aptasensor for sensitive and selective detection of PCB72. Abstract : Graphitic carbon nitride (C3 N4 ) is a carbon-based metal-free semiconductor, which has been widely explored as a photoactive material. In this work, the CdS, reduced graphene oxide (rGO) and C3 N4 (CdS–rGO–C3 N4 ) composite was synthesized by a simple one-pot hydrothermal method and utilized to construct a photoelectrochemical (PEC) sensor. Compared with CdS, C3 N4 and CdS–C3 N4, the CdS–rGO–C3 N4 composite exhibited enhanced photoelectrochemical (PEC) performance, due to the expanded absorption of C3 N4 in the visible region by CdS and promoted the charge carrier separation of a photoelectrode by rGO. Based on a glassy carbon electrode (GCE) modified with CdS–rGO–C3 N4 and a PCB72-binding aptamer (ap/CdS–rGO–C3 N4 /GCE), a PEC aptasensor for the detection of 2, 3′, 5, 5′-tetrachlorobiphenyl (PCB72) was developed. When H2 O2 was added into the electrolyte, the PEC sensor exhibited an amplified response toward PCB72, and could be operated in a self-powered mode at a potential of 0 V. Under optimum conditions, the constructed PEC aptasensor exhibited a wide linear range of 10 to 1000 ng mL −1 for PCB72 detection, with a low detection limit (S/N = 3) of 1.0 ng mL −1 . Moreover, this aptasensor exhibited high selectivity, good reproducibility and high stability. The applicability of the developed PEC strategy was demonstrated by determining PCB72 in environmental water.