Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 203, Issue -, Pages 89-94Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.06.059
Keywords
Graphene-ZnxCd1-xS QDs; Hydrothermal method; Photoelectrochemical sensor; Cu2+ detection
Funding
- Natural Science Foundation of China [61176004, 61204078, U1304505]
- Program for Innovative Research Team (in Science and Technology) in University of Henan Province [13IRTSTHN026]
- Key Project of Science and Technology of Henan Province [122102210561, 13A150517, 14A150002]
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Graphene-ZnxCd1-xS quantum dots (QDs) hybrid materials were successfully prepared via one-step hydrothermal method. TEM and HRTEM results proved that Zn0.8Cd0.2S QDs with an average size of similar to 6 nm were homogeneously dispersed on graphene sheets, which favorited the charge separation and improvement of the photocurrent intensity. The controlled experiments proved that graphene-Zn0.8Cd0.2S/ITO electrode with 2 mg graphene dosage exhibited the highest photocurrent at an applied voltage of 0.2 V. Therefore, a photoelectrochemical sensor was developed to detect Cu2+ using graphene-Zn0.8Cd0.2S/ITO electrode. The sensor exhibited good selectivity and linear relationship from 1 mu mol dm(-3) to 120 mu mol dm(-3) with detection limit of 6.5 nmol dm(-3) at a signal-to-noise (S/N) ratio of 3. (C) 2014 Elsevier B. V. All rights reserved.
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