Synthesis of CdS quantum dots decorated graphene nanosheets and non-enzymatic photoelectrochemical detection of glucose

• Published in: Electrochimica acta Vol. 133; pp. 615 - 622
• Main Authors: Zhang, Xuyan, Xu, Fang, Zhao, Bingqing, Ji, Xin, Yao, Yanwen, Wu, Dapeng, Gao, Zhiyong, Jiang, Kai
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2014
• Subjects: Cadmium sulfides; Durability; Electrochemical impedance spectroscopy; Glucose; Glucose detection; Graphene; Graphene-CdS hybrid material; Hydrothermal method; Nanostructure; Photoelectrochemical sensor; Quantum dots; Sensors; Graphene-CdS hybrid material; Photoelectrochemical sensor; Hydrothermal method; Glucose detection
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2014.04.089

•Graphene-CdS hybrid materials were prepared via one-step hydrothermal method.•Graphene-CdS was used as non-enzymatic photoelectrochemical sensor to detect glucose.•Glucose in real sample was detected and showed good specificity and sensitivity. Graphene-CdS quantum dots (QDs) hybrid materials were successfully prepared via one-step hydrothermal method. CdS QDs with average size of ∼6nm were dispersed on graphene sheets with high coverage through non-covalent bonding. Photocurrent and electrochemical impedance spectroscopy (EIS) results suggested that the best dosage of graphene oxide for graphene-CdS hybrid materials is 0.5% (G0.5-CdS). When G0.5-CdS QDs was used as photoanode materials in non-enzymatic sensor, and the sensor was used to detect glucose and displayed satisfactory analytical performance with good linear range from 0.1∼4mmol dm−3 with a detection limit of 7μmol dm−3 at a signal-to-noise ratio of 3. The sensor also possessed high selectivity and durability in trace detection of glucose.